The Experts below are selected from a list of 15477 Experts worldwide ranked by ideXlab platform
Santosh Nepal - One of the best experts on this subject based on the ideXlab platform.
-
impacts of climate change on the Hydrological Regime of the koshi river basin in the himalayan region
Journal of Hydro-environment Research, 2016Co-Authors: Santosh NepalAbstract:Abstract Understanding the potential impact of climate change on the Hydrological Regime in the Himalayan region is of great importance for sustainable water resources management. This study assessed the historic and projected climate trends in the Koshi river basin using statistical analysis. The Hydrological characteristics and the contribution of different runoff components under present and projected future conditions were investigated in the Dudh Koshi sub-basin using the J2000 model. Data for 1995 to 2096 from the Providing REgional Climates for Impacts Studies (PRECIS) regional climate model were used in the J2000 model to project the impact of climate change under the A1B climate scenario in mid-century (2040–2050) and late-century (2086–2096), compared to baseline (2000–2010). Present climate showed an increase in average temperature in the river basin at a rate of 0.058 °C/year for maximum temperature and 0.014 °C/year for minimum temperature over the past forty years. The model simulation of the Hydrological Regime from 1985 to1997 was satisfactory. The average annual contribution of snow and glacier melt to total discharge was about 34%, whereas it was 63% in the pre-monsoon season (March to May). The projected future results from the model indicate a 13% increase in annual discharge by mid-century followed by a slight decrease; and a 16% increase in evapotranspiration by the end of the century. Snowfall is projected to decrease substantially due to the rise in temperature, the basin will lose snow storage capacity, and there will be a marked decrease in snowmelt runoff from non-glaciated areas. In contrast, melt from glaciated areas will increase up to mid-century and start decreasing thereafter. The model results suggest that snowfall pattern, snowmelt, discharge, and evapotranspiration are all sensitive to the effects of climate change.
-
Impact of climate change on the Hydrological Regime of the Indus, Ganges and Brahmaputra river basins: a review of the literature
International Journal of Water Resources Development, 2015Co-Authors: Santosh Nepal, Arun Bhakta ShresthaAbstract:The Indus, Ganges and Brahmaputra river basins support 700 million people in Asia. The water resources are used for irrigation, drinking, industry, navigation and hydropower. This paper reviews the literature on the impact of climate change on the Hydrological Regime of these river basins and suggests that the different basins are likely to be affected in different ways. Climate change will have a marked affect on meltwater in the Indus Basin and may result in increased flood risk in the Brahmaputra Basin. The overall impact on annual discharge is likely to be low, but more studies are required to understand intra-annual changes and the impact of extreme events.
Michael J Gormally - One of the best experts on this subject based on the ideXlab platform.
-
the use of gis techniques to quantify the Hydrological Regime of a karst wetland skealoghan turlough in ireland
Applied Vegetation Science, 2008Co-Authors: James Moran, S Kelly, Sheehy M Skeffington, Michael J GormallyAbstract:ABSTRACT Question: Can GIS and GPS technology be used to quantify the Hydrological Regime of different plant communities on turloughs (groundwater dependent calcareous wetlands)? Location: Skealoghan turlough, County Mayo, Ireland. Methods: Plant communities were mapped and digitised with GIS software and a digital elevation model of the site was constructed from differential GPS data. Together with records of water level fluctuations on the site from May 2001 to May 2004, these data were used to calculate Hydrological variables for each plant community. Hierarchical cluster analysis was used to identify groups of plant communities with similar Hydrological Regimes. Results: 15 plant communities were mapped at Skealoghan, with the Cirsio-Molinietum and Ranunculo-Potentilletum anserinae being the dominant phytosociological associations. Skealoghan is subject to large temporal and spatial variation in its Hydrological Regime and fluctuations in water level are intrinsically linked to rainfall. The spatial v...
-
the influence of Hydrological Regime and grazing management on the plant communities of a karst wetland skealoghan turlough in ireland
Applied Vegetation Science, 2008Co-Authors: James Moran, Sheehy M Skeffington, Michael J GormallyAbstract:ABSTRACT Question: What is the influence of Hydrological Regime, soils and management on the plant community composition and species richness of Skealoghan turlough (groundwater dependent calcareous wetland). Location: Skealoghan turlough, County Mayo, Ireland. Methods: Percentage cover of vascular plants and bryophytes were recorded, and data on Hydrological Regimes, soils and management were collected. Data were analysed using multivariate statistical techniques. Results: A total of 69 species of vascular plants and mosses were recorded. Cluster analysis grouped the samples into two separate communities, the Cirsio-Molinietum and the Ranunculo-Potentilletum anserinae plant communities. The plant community composition and species richness followed a main gradient down into the turlough basin, but also varied with microtopography, resulting in a mosaic of vegetation types. Conclusions: The biodiversity and conservation value of the site is linked to the heterogeneity in its physical environment in which h...
James Moran - One of the best experts on this subject based on the ideXlab platform.
-
the use of gis techniques to quantify the Hydrological Regime of a karst wetland skealoghan turlough in ireland
Applied Vegetation Science, 2008Co-Authors: James Moran, S Kelly, Sheehy M Skeffington, Michael J GormallyAbstract:ABSTRACT Question: Can GIS and GPS technology be used to quantify the Hydrological Regime of different plant communities on turloughs (groundwater dependent calcareous wetlands)? Location: Skealoghan turlough, County Mayo, Ireland. Methods: Plant communities were mapped and digitised with GIS software and a digital elevation model of the site was constructed from differential GPS data. Together with records of water level fluctuations on the site from May 2001 to May 2004, these data were used to calculate Hydrological variables for each plant community. Hierarchical cluster analysis was used to identify groups of plant communities with similar Hydrological Regimes. Results: 15 plant communities were mapped at Skealoghan, with the Cirsio-Molinietum and Ranunculo-Potentilletum anserinae being the dominant phytosociological associations. Skealoghan is subject to large temporal and spatial variation in its Hydrological Regime and fluctuations in water level are intrinsically linked to rainfall. The spatial v...
-
the influence of Hydrological Regime and grazing management on the plant communities of a karst wetland skealoghan turlough in ireland
Applied Vegetation Science, 2008Co-Authors: James Moran, Sheehy M Skeffington, Michael J GormallyAbstract:ABSTRACT Question: What is the influence of Hydrological Regime, soils and management on the plant community composition and species richness of Skealoghan turlough (groundwater dependent calcareous wetland). Location: Skealoghan turlough, County Mayo, Ireland. Methods: Percentage cover of vascular plants and bryophytes were recorded, and data on Hydrological Regimes, soils and management were collected. Data were analysed using multivariate statistical techniques. Results: A total of 69 species of vascular plants and mosses were recorded. Cluster analysis grouped the samples into two separate communities, the Cirsio-Molinietum and the Ranunculo-Potentilletum anserinae plant communities. The plant community composition and species richness followed a main gradient down into the turlough basin, but also varied with microtopography, resulting in a mosaic of vegetation types. Conclusions: The biodiversity and conservation value of the site is linked to the heterogeneity in its physical environment in which h...
V. N. Mikhailov - One of the best experts on this subject based on the ideXlab platform.
-
impact of reservoirs on the Hydrological Regime and morphology of the lower reaches and delta of the zambezi river mozambique
Water Resources, 2015Co-Authors: V. N. Mikhailov, V I Kravtsova, M. V. IsupovaAbstract:The recent general geographic characteristics of the Zambezi River basin and its delta are discussed. The main hydroclimatic features of the river basin and delta are revealed. The fluvial and marine factors that influence the river delta are discussed in detail. Close attention is given to the effect of the large reservoirs of Kariba and Cahora Bassa on the Hydrological Regime, morphology, and ecosystem of the Lower Zambezi valley and the river delta. Considerable changes in the delta and its coastline that occurred over the last decades are revealed.
-
The Hydrological Regime and the morphological structure of the Godavari River delta (India)
Water Resources, 2011Co-Authors: V. N. MikhailovAbstract:The major Hydrological and geographic characteristics of the Godavari River and the coastal zone of the Bay of Bengal that have their effect on the Hydrological Regime and the morphological structure of the river delta are considered. The hydrographic, climatic, and environmental conditions in the Godavari delta are described. The specific features of Hydrological processes in the delta are considered, including river and bay water mixing and the impact of tropic storms and hurricanes on the delta. The main features of morphological processes in the delta are revealed, including cyclic changes in the delta in Holocene and the dynamics of the channel network and delta coastline in the past 150 years. It is shown that the processes of erosion and retreat of the delta coastline became more active in the late XX century.
-
Regularities in sea level rise impact on the Hydrological Regime and morphological structure of river deltas
Water Resources, 2010Co-Authors: V. N. Mikhailov, M V MikhailovaAbstract:The problem of assessment of sea level rise impact on the Hydrological Regime and morphological structure of river deltas is discussed. Studies of the response of river deltas, which are among the most vulnerable natural objects, to the sea level rise has become urgent because of the global climate warming and the associated acceleration of the World Ocean level rise. Methods are described that can be used for the analysis, calculation, and prediction of sea level rise impact on submergence of deltas, propagation of backwater from the sea tides, surges, and salt seawater intrusion. Special emphasis is given to channel processes in delta branches, which accompany sea level rise, as well as to delta coastline erosion and flow redistribution among branches. In the course of research, due consideration was taken of the experience gained in studying the response of river deltas on the Caspian Sea coasts to the recent considerable level rise in this water body.
-
Variations of the Hydrological Regime, morphological structure, and landscapes of the Indus River delta (Pakistan) under the effect of large-scale water management measures
Water Resources, 2009Co-Authors: V I Kravtsova, V. N. Mikhailov, N. A. EfremovaAbstract:The Hydrological Regime, morphological structure, and landscapes of the Indus River delta are considered, and the significant changes that took place in them during the second half of the XX century because of the large-scale hydraulic engineering activity in the river’s basin, runoff regulation, and water withdrawal for irrigation are analyzed. It is shown that the abrupt decrease in water and sediment runoff in the Indus have affected the Hydrological processes in the river’s lower reaches and caused delta degradation.
-
Peculiarities of the Hydrological Regime of the Ganges and Brahmaputra river mouth area
Water Resources, 2006Co-Authors: V. N. Mikhailov, M. A. DotsenkoAbstract:The basic peculiarities of the Hydrological Regime of one of the largest mouth areas of the world, i.e., the common mouth of the rivers of Ganges and Brahmaputra, are discussed. The main features of natural conditions (including climatic) of the mouth of these rivers and the delta drainage system are characterized. The Hydrological Regime of the Ganges and Brahmaputra rivers, the largest rivers of South Asia, is studied in greater detail; the quantitative assessments of the water and sediment runoff of these rivers are specified. Provision is made for revealing the basic peculiarities of river flow distribution among numerous delta branches, annual floods during southwest monsoons, tidal phenomena in the maritime zone of the delta, and disastrous storm surges and inundations in the period of tropical cyclones. Flood control measures taken in Bangladesh to protect the population and lands are described.
Bernard Montuelle - One of the best experts on this subject based on the ideXlab platform.
-
long term impact of Hydrological Regime on structure and functions of microbial communities in riverine wetland sediments
FEMS Microbiology Ecology, 2013Co-Authors: Arnaud Foulquier, Bernadette Volat, Marc Neyra, Gudrun Bornette, Bernard MontuelleAbstract:In a context of global change, alterations in the water cycle may impact the structure and function of terrestrial and aquatic ecosystems. Wetlands are particularly at risk because Hydrological Regime has a major influence on microbially mediated biogeochemical processes in sediments. While the influence of water availability on wetland biogeochemical processes has been comprehensively studied, the influence of Hydrological Regime on microbial community structure has been overlooked. We tested for the effect of Hydrological Regime on the structure and functions of microbial communities by comparing sediments collected at multiple sites in the Ain departement (Eastern France). Each site consisted of two plots, one permanently and one seasonally inundated. At the time of sampling, all plots were continuously inundated for more than 6 months but still harboured distinct bacterial communities. This change in community structure was not associated with marked modifications in the rates of microbial activities involved in the C and N cycles. These results suggest that the observed structural change could be related to bacterial taxa responding to the environmental variations associated with different Hydrological Regimes, but not strongly associated with the biogeochemical processes monitored here.
-
Long‐term impact of Hydrological Regime on structure and functions of microbial communities in riverine wetland sediments
FEMS Microbiology Ecology, 2013Co-Authors: Arnaud Foulquier, Bernadette Volat, Marc Neyra, Gudrun Bornette, Bernard MontuelleAbstract:In a context of global change, alterations in the water cycle may impact the structure and function of terrestrial and aquatic ecosystems. Wetlands are particularly at risk because Hydrological Regime has a major influence on microbially mediated biogeochemical processes in sediments. While the influence of water availability on wetland biogeochemical processes has been comprehensively studied, the influence of Hydrological Regime on microbial community structure has been overlooked. We tested for the effect of Hydrological Regime on the structure and functions of microbial communities by comparing sediments collected at multiple sites in the Ain departement (Eastern France). Each site consisted of two plots, one permanently and one seasonally inundated. At the time of sampling, all plots were continuously inundated for more than 6 months but still harboured distinct bacterial communities. This change in community structure was not associated with marked modifications in the rates of microbial activities involved in the C and N cycles. These results suggest that the observed structural change could be related to bacterial taxa responding to the environmental variations associated with different Hydrological Regimes, but not strongly associated with the biogeochemical processes monitored here.
