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Okke Batelaan - One of the best experts on this subject based on the ideXlab platform.
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Three-dimensional hydrostratigraphical modelling to support evaluation of recharge and saltwater intrusion in a coastal Groundwater System in Vietnam
Hydrogeology Journal, 2014Co-Authors: Vu Thanh Tam, Okke Batelaan, Pham Quy NhanAbstract:A intrusão salina é geralmente associada a uma subida do nível do mar ou a uma intrusão induzida devida ao excesso de extração de água subterrânea em aquíferos costeiros. No entanto, a heterogeneidade hidrogeológica da subsuperfície joga também um papel importante na (não)-intrusão. São estudadas as condições hidrogeológicas locais para a recarga e para a intrusão salina num sistema hidrogeológico costeiro do Vietname, onde as formações geológicas exibem litologias altamente heterogéneas. Foi construído um modelo hidroestratigráfico tridimensional (3D) sólido da área de estudo, através de um procedimento classificativo recursivo. O procedimento inclui uma análise de agrupamento que usa como parâmetros a composição litológica, a distribuição em profundidade e a espessura de cada intervalo litológico distinto de 47 sondagens, para distinguir e mapear intervalos de perfis de sondagem com propriedades litológicas similares em diferentes formações geológicas. A partir do modelo sólido construído foi gerado um diagrama de cerca tridimensionnal da hidroestratigrafia usado como uma ferramenta para avaliar os caminhos de recarga e a intrusão salina no sistema hidrogeológico. São usadas medições do nível da água subterrânea, do quimismo e de resistividade geofísica com corrente direta (CD) para suportar o modelo hidroestratigráfico. Resultados desta pesquisa contribuem para explicar porque é que o sistema aquífero da área em estudo não é praticamente influenciado pela intrusão salina, o que é relativamente comum nos aquíferos costeiros do Vietname. L’intrusion saline est généralement liée à l’augmentation du niveau marin ou induite par un pompage excessif des eaux souterraines dans les aquifères côtiers. Cependant, l’hétérogénéité hydrogéologique du sous-sol joue également un rôle important dans l’intrusion et la non intrusion. Les conditions hydrogéologiques locales concernant la recharge et l’intrusion saline sont étudiées dans un système aquifère côtier au Vietnam où les formations géologiques présentent des lithologies fortement hétérogènes. Un modèle hydrostratigraphique tri-dimensionnel a été élaboré pour la zone d’étude par l’intermédiaire d’une procédure de classification récursive. La procédure comprend une analyse de cluster qui utilise comme paramètres la composition lithologique, la longueur de la distribution et l’épaisseur de chaque intervalle lithologique distinct de 47 forages, pour distinguer et cartographier les intervalles de logs de forage de propriétés lithologiques similaires dans des formations géologiques différentes. Un schéma hydrostratigraphique en 3D est ainsi généré à partir du modèle construit et est utilisé comme un outil pour évaluer les écoulements liés à la recharge et à l’intrusion saline dans le système aquifère. Le niveau d’eau souterraine et la chimie de l’eau, et des mesures directes géophysiques de résistivité, sont utilisés pour calibrer le modèle hydrostratigraphique. Les résultats de cette recherche contribuent à l’explication de la raison pour laquelle le système aquifère de la région d’étude n’est presque pas influencé par une intrusion saline, ce qui est par ailleurs relativement courant dans les aquifères côtiers du Vietnam. Saltwater intrusion is generally related to seawater-level rise or induced intrusion due to excessive Groundwater extraction in coastal aquifers. However, the hydrogeological heterogeneity of the subsurface plays an important role in (non-)intrusion as well. Local hydrogeological conditions for recharge and saltwater intrusion are studied in a coastal Groundwater System in Vietnam where geological formations exhibit highly heterogeneous lithologies. A three-dimensional (3D) hydrostratigraphical solid model of the study area is constructed by way of a recursive classification procedure. The procedure includes a cluster analysis which uses as parameters geological formation, lithological composition, distribution depth and thickness of each lithologically distinctive drilling interval of 47 boreholes, to distinguish and map well-log intervals of similar lithological properties in different geological formations. A 3D hydrostratigraphical fence diagram is then generated from the constructed solid model and is used as a tool to evaluate recharge paths and saltwater intrusion to the Groundwater System. Groundwater level and chemistry, and geophysical direct current (DC) resistivity measurements, are used to support the hydrostratigraphical model. Results of this research contribute to the explanation of why the aquifer System of the study area is almost uninfluenced by saltwater intrusion, which is otherwise relatively common in coastal aquifers of Vietnam. Xâm nhập mặn thường liên quan đến nước biển dâng hay khai thác nước quá mức trong các tầng chứa nước ven biển. Tuy nhiên, tính phân dị về địa chất thủy văn của môi trường chứa nước cũng đóng vai trò quan trọng ảnh hưởng đến quá trình xâm nhập mặn. Trong bài báo này, các tác giả đã nghiên cứu điều kiện địa chất thủy văn đối với bổ cập và xâm nhập mặn của một hệ thống nước ngầm ven biển ở Việt Nam gồm các thành tạo địa chất có tính phân dị cao về thành phần thạch học. Một mô hình địa tầng địa chất thủy văn ba chiều (3D) đã được các tác giả xây dựng theo một quy trình phân loại lặp. Quy trình này bao gồm việc áp dụng kỹ thuật phân tích nhóm dựa trên 4 thông số về tuổi địa tầng, thành phần, chiều sâu phân bố và chiều dày của các lớp thạch học trong cột địa tầng của 47 lỗ khoan để nhóm gộp và liên kết các khoảng chiều sâu khoan thành các lớp có cùng đặc tính giống nhau. Trên cơ sở kết quả phân tích nhóm này, mô hình và mạng lưới mặt cắt địa tầng địa chất thủy văn ba chiều đã được xây dựng và sử dụng như một công cụ để luận giải con đường bổ cập và xâm nhập mặn đến hệ thống nước dưới đất. Mực nước, thành phần hóa học của nước dưới đất và kết quả đo mặt cắt điện cũng đã được sử dụng để hỗ trợ thành lập mô hình và mặt cắt nói trên. Kết quả của nghiên cứu này đã góp phần lý giải tại sao hệ thống nước dưới đất trong vùng nghiên cứu hầu như không bị xâm nhập mặn, trong khi phần lớn các tầng chứa nước ven biển khác ở Việt Nam thường hay bị nhiễm mặn. 海水入侵通常与海平面上升或由于过度开采沿海含水层的地下水而诱发的入侵有关。然而,地表之下的水文地质非均质性在(非)入侵中发挥着重要作用。本文研究了越南一个沿海地下水系统的补给和海水入侵的水文地质条件,这个地下水系统的地层具有很高的非均质性岩性。通过递归分类程序建立了研究区三维水文地层实体模型。这个程序包括聚类分析,聚类分析结果作为47个钻孔中每个岩性上与众不同钻井间隔的岩性组成、分布深度和厚度的参数,以区分和绘制不同地地层类似岩性特性的测井间隔。根据建立的实体模型生成三维水文地层栅状剖面图,用作评价地下水系统补给通道和海水入侵的工具。地下水位、化学条件及地球物理直流电电阻率等各项测量结果用来支持水文地层模型。这项研究有助于解释为什么研究区的含水层系统几乎没有受到海水入侵的影响,而海水入侵在越南其他沿海含水层中相对很常见。 La intrusión de agua salada está generalmente relacionada con el ascenso del nivel del mar o la intrusión inducida debido a una extracción excesiva de agua subterránea en los acuíferos costeros. Sin embargo, la heterogeneidad hidrogeológica del subsuelo también juega un rol importante en la (no) intrusión. Se estudian condiciones hidrogeológicas locales para la recarga y la intrusión de agua salada en un sistema de agua subterránea costero en Vietnam donde las formaciones geológicas exhiben litologías altamente heterogéneas. Se construyó un sólido modelo tridimensional hidroestratigráfico del área de estudio a través de un procedimiento de clasificación recursivo. El procedimiento incluye un análisis en cluster que usa como parámetros la composición litológico, la distribución en la profundidad y espesor de cada intervalo perforado litológicamente distintivo de 47 perforaciones, para distinguir y mapear los intervalos de registros de pozos de propiedades litológicas similares en diferentes formaciones geológicas. Se generó un block diagrama hidroestratigráfico 3D a partir del modelo sólido construido y es usado como una herramienta para evaluar las trayectorias de recarga y la intrusión de agua salada en el sistema de agua subterránea. El nivel y la química del agua subterránea, y las medidas geofísicas de resistividad de corriente continua (DC), son usados para apoyar el modelo hidroestratigráfico. Los resultados de esta investigación contribuyen a la explicación de por qué el sistema acuífero del área de estudio casi nunca está influenciado por la intrusión de agua salada, lo que es por otra parte relativamente común en acuíferos costeros de Vietnam.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences, 2012Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. In most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences Discussions, 2011Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Abstract. Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. Seasonally, in most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
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predicting land use change and its impact on the Groundwater System of the kleine nete catchment belgium
Hydrology and Earth System Sciences, 2007Co-Authors: Jef Dams, Okke Batelaan, S. T. WoldeamlakAbstract:Land-use changes are frequently indicated to be one of the main human-induced factors influencing the Groundwater System. For land-use change, Groundwater re- search has mainly focused on the change in water quality thereby neglecting changes in quantity. The objective of this paper is to assess the impact of land-use changes, from 2000 until 2020, on the hydrological balance and in partic- ular on Groundwater quantity, as results from a case study in the Kleine Nete basin, Belgium. New is that this study tests a methodology, which couples a land-use change model with a water balance and a steady-state Groundwater model. Four future land-use scenarios (A1, A2, B1 and B2) based on the Special Report on Emission Scenarios (SRES) are modelled with the CLUE-S model. Water balance com- ponents, Groundwater level and baseflow are simulated us- ing the WetSpass model in conjunction with a steady-state MODFLOW Groundwater flow model. Results show that the average recharge decreases with 2.9, 1.6, 1.8 and 0.8% for scenario A1, A2, B1 and B2, respectively, over the 20 cov- ered years. The predicted reduction in recharge results in a small decrease of the average Groundwater level in the basin, ranging from 2.5 cm for scenario A1 to 0.9 cm for scenario B2, and a reduction of the baseflow with maximum 2.3% and minimum 0.7% for scenario A1 and B2, respectively. Al- though these averages appear to indicate small changes in the Groundwater System, spatial analysis shows that much larger changes are located near the major cities in the study area. Hence, spatial planning should take better account of effects of land-use change on the Groundwater System and define mitigating actions for reducing the negative impacts of land-use change.
J. Dams - One of the best experts on this subject based on the ideXlab platform.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences, 2012Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. In most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences Discussions, 2011Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Abstract. Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. Seasonally, in most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
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Forecasting land-use change and its impact on the Groundwater System of the Kleine Nete catchment, Belgium
Hydrology and Earth System Sciences Discussions, 2007Co-Authors: J. Dams, S. T. Woldeamlak, O. BatelaanAbstract:Land-use change and climate change, along with Groundwater pumping are frequently indicated to be the main human-induced factors influencing the Groundwater System. Up till now, research has mainly been focusing on the effect of the water quality of these human-induced changes on the Groundwater System, often neglecting changes in quantity. The focus in this study is on the impact of land-use changes in the near future, from 2000 until 2020, on the Groundwater quantity and the general hydrologic balance of a sub-catchment of the Kleine Nete, Belgium. This study tests a new methodology which involves coupling a land-use change model with a water balance model and a Groundwater model. The future land-use is modelled with the CLUE-S model. Four scenarios (A1, A2, B1 and B2) based on the Special Report on Emission Scenarios (SRES) are used for the land-use modelling. Water balance components, Groundwater level and baseflow are simulated using the WetSpass model in conjunction with a MODFLOW Groundwater model. Results show that the average recharge slowly decreases for all scenarios, the decreases are 2.9, 1.6, 1.8 and 0.8% for respectively scenario A1, A2, B1 and B2. The predicted reduction in recharge results in a small decrease of the average Groundwater level, ranging from 2.5 cm for scenario A1 to 0.9 cm for scenario B2, and a reduction of the total baseflow with maximum 2.3% and minimum 0.7% respectively for scenario A1 and B2. Although these average values do not indicate significant changes for the Groundwater System, spatial analysis of the changes shows the changes are concentrated in the neighbourhood of the major cities in the study areas. It is therefore important for spatial managers to take the Groundwater System into account for reducing the negative impacts of land-use and climate change as much as possible.
Elga Salvadore - One of the best experts on this subject based on the ideXlab platform.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences, 2012Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. In most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences Discussions, 2011Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Abstract. Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. Seasonally, in most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
Victor Ntegeka - One of the best experts on this subject based on the ideXlab platform.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences, 2012Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. In most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences Discussions, 2011Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Abstract. Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. Seasonally, in most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
Patrick Willems - One of the best experts on this subject based on the ideXlab platform.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences, 2012Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. In most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
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Spatio-temporal impact of climate change on the Groundwater System
Hydrology and Earth System Sciences Discussions, 2011Co-Authors: J. Dams, Elga Salvadore, T. Van Daele, Victor Ntegeka, Patrick Willems, Okke BatelaanAbstract:Abstract. Given the importance of Groundwater for food production and drinking water supply, but also for the survival of Groundwater dependent terrestrial ecoSystems (GWDTEs) it is essential to assess the impact of climate change on this freshwater resource. In this paper we study with high temporal and spatial resolution the impact of 28 climate change scenarios on the Groundwater System of a lowland catchment in Belgium. Our results show for the scenario period 2070–2101 compared with the reference period 1960–1991, a change in annual Groundwater recharge between −20% and +7%. On average annual Groundwater recharge decreases 7%. Seasonally, in most scenarios the recharge increases during winter but decreases during summer. The altered recharge patterns cause the Groundwater level to decrease significantly from September to January. On average the Groundwater level decreases about 7 cm with a standard deviation between the scenarios of 5 cm. Groundwater levels in interfluves and upstream areas are more sensitive to climate change than Groundwater levels in the river valley. Groundwater discharge to GWDTEs is expected to decrease during late summer and autumn as much as 10%, though the discharge remains at reference-period level during winter and early spring. As GWDTEs are strongly influenced by temporal dynamics of the Groundwater System, close monitoring of Groundwater and implementation of adaptive management measures are required to prevent ecological loss.
