The Experts below are selected from a list of 6711 Experts worldwide ranked by ideXlab platform
Xueyan Ye - One of the best experts on this subject based on the ideXlab platform.
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Mechanism of Suspended Kaolinite Particle Clogging in Porous Media During Managed Aquifer Recharge.
Ground Water, 2019Co-Authors: Xueyan Ye, Xinqiang Du, Sijia Ma, Jingtong Zhao, Ying LuAbstract:: Managed Aquifer Recharge is an effective strategy for urban stormwater management. Chemical ions are normally retained in stormwater and groundwater and may accelerate clogging during the Recharge process. However, the effect of water chemistry on physical clogging has not previously been investigated. In this study, we investigated the hydrogeochemical mechanism of saturated porous media clogging in a series of column experiments. The column was packed with river sand and added suspensions of kaolinite particles. Calcium chloride and sodium chloride are used as representative ions to study chemical effects. We found that an increase in ionic strength resulted in retention of kaolinite solids in the column, with a breakthrough peak of C/C0 value of 1 to 0.2. The corresponding hydraulic conductivity decreased with increased solids clogging. Divalent cations were also found to have a greater influence on kaolinite particle clogging than monovalent cations. The enhanced hydrochemical-related clogging was caused by kaolinite solids flocculating and increasing the deposition rate coefficient by 1 to 2 times in high ionic strength conditions. Three clogging mechanisms of kaolinite solids are proposed: surface filtration, inner blocking, and attachment. This study further deepens the understanding of the mechanisms of solids clogging during Aquifer Recharge and demonstrates the significance of ionic strength on Recharge clogging risk assessments.
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surface clogging process modeling of suspended solids during urban stormwater Aquifer Recharge
Journal of Environmental Sciences-china, 2012Co-Authors: Zijia Wang, Xinqiang Du, Yuesuo Yang, Xueyan YeAbstract:Abstract Aquifer Recharge, which uses urban stormwater, is an effective technique to control the negative effects of groundwater overexploitation, while clogging problems in infiltration systems remain the key restricting factor in broadening its practice. Quantitative understanding of the clogging process is still very poor. A laboratory study was conducted to understand surface physical clogging processes, with the primary aim of developing a model for predicting suspended solid clogging processes before Aquifer Recharge projects start. The experiments investigated the clogging characteristics of different suspended solid sizes in Recharge water by using a series of one-dimensional fine quartz sand columns. The results showed that the smaller the suspended particles in Recharge water, the farther the distance of movement and the larger the scope of clogging in porous media. Clogging extents in fine sand were 1 cm, for suspended particle size ranging from 0.075 to 0.0385 mm, and 2 cm, for particles less than 0.0385 mm. In addition, clogging development occurred more rapidly for smaller suspended solid particles. It took 48, 42, and 36 hr respectively, for large-, medium-, and small-sized particles to reach pre-determined clogging standards. An empirical formula and iteration model for the surface clogging evolution process were derived. The verification results obtained from stormwater Recharge into fine sand demonstrated that the model could reflect the real laws of the surface clogging process.
Yuesuo Yang - One of the best experts on this subject based on the ideXlab platform.
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surface clogging process modeling of suspended solids during urban stormwater Aquifer Recharge
Journal of Environmental Sciences-china, 2012Co-Authors: Zijia Wang, Xinqiang Du, Yuesuo Yang, Xueyan YeAbstract:Abstract Aquifer Recharge, which uses urban stormwater, is an effective technique to control the negative effects of groundwater overexploitation, while clogging problems in infiltration systems remain the key restricting factor in broadening its practice. Quantitative understanding of the clogging process is still very poor. A laboratory study was conducted to understand surface physical clogging processes, with the primary aim of developing a model for predicting suspended solid clogging processes before Aquifer Recharge projects start. The experiments investigated the clogging characteristics of different suspended solid sizes in Recharge water by using a series of one-dimensional fine quartz sand columns. The results showed that the smaller the suspended particles in Recharge water, the farther the distance of movement and the larger the scope of clogging in porous media. Clogging extents in fine sand were 1 cm, for suspended particle size ranging from 0.075 to 0.0385 mm, and 2 cm, for particles less than 0.0385 mm. In addition, clogging development occurred more rapidly for smaller suspended solid particles. It took 48, 42, and 36 hr respectively, for large-, medium-, and small-sized particles to reach pre-determined clogging standards. An empirical formula and iteration model for the surface clogging evolution process were derived. The verification results obtained from stormwater Recharge into fine sand demonstrated that the model could reflect the real laws of the surface clogging process.
Kim Alexander - One of the best experts on this subject based on the ideXlab platform.
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key dimensions of public acceptance for managed Aquifer Recharge of urban stormwater
Journal of Cleaner Production, 2015Co-Authors: Aditi Mankad, Andrea Walton, Kim AlexanderAbstract:Abstract The present study qualitatively explored psychological and policy-related factors underpinning community acceptance of treated urban stormwater for domestic uses, as well as community views regarding managed Aquifer Recharge for stormwater treatment and delivery. Participants ( N = 36) took part in 2-h community workshops and focus groups, where they discussed existing knowledge and perceptions of stormwater and managed Aquifer Recharge. Results showed a high general acceptance for managed Aquifer Recharge using stormwater. Nine key social dimensions were found to be indicators of acceptance for stormwater: 1. Fair distribution of treated stormwater, 2. Trust in managed Aquifer Recharge technology and scientific information, 3. Environmental impact of managed Aquifer Recharge, 4. Cost of treating and distributing stormwater, 5. Wastage of stormwater if not utilised, 6. Issues relating to future water security, 7. Water quality, 8. Education, and 9. Perceived effectiveness of the stormwater scheme. These important dimensions and drivers of acceptance emerged within the data, highlighting what is important to an urban community with respect to acceptance of managed Aquifer Recharge of stormwater for potable and non-potable uses. A proposed model of social acceptance is presented, incorporating the policy-related characteristics, psychological factors and communication factors which emerged during the qualitative analysis as predictors of social acceptance for the managed Aquifer Recharge of stormwater. This model helps to conceptualise how the public perceives the use of stormwater in the home, and how public opinion of stormwater sits relative to other forms of alternative water, such as recycled water and rainwater. It is seems that public acceptance for stormwater is higher than for other types of alternative water, which is a significant finding in this research area. Future research can further explore the predictive nature of the hypothesised relationships between perceptions and intentions to use stormwater and water use behaviours.
Zijia Wang - One of the best experts on this subject based on the ideXlab platform.
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surface clogging process modeling of suspended solids during urban stormwater Aquifer Recharge
Journal of Environmental Sciences-china, 2012Co-Authors: Zijia Wang, Xinqiang Du, Yuesuo Yang, Xueyan YeAbstract:Abstract Aquifer Recharge, which uses urban stormwater, is an effective technique to control the negative effects of groundwater overexploitation, while clogging problems in infiltration systems remain the key restricting factor in broadening its practice. Quantitative understanding of the clogging process is still very poor. A laboratory study was conducted to understand surface physical clogging processes, with the primary aim of developing a model for predicting suspended solid clogging processes before Aquifer Recharge projects start. The experiments investigated the clogging characteristics of different suspended solid sizes in Recharge water by using a series of one-dimensional fine quartz sand columns. The results showed that the smaller the suspended particles in Recharge water, the farther the distance of movement and the larger the scope of clogging in porous media. Clogging extents in fine sand were 1 cm, for suspended particle size ranging from 0.075 to 0.0385 mm, and 2 cm, for particles less than 0.0385 mm. In addition, clogging development occurred more rapidly for smaller suspended solid particles. It took 48, 42, and 36 hr respectively, for large-, medium-, and small-sized particles to reach pre-determined clogging standards. An empirical formula and iteration model for the surface clogging evolution process were derived. The verification results obtained from stormwater Recharge into fine sand demonstrated that the model could reflect the real laws of the surface clogging process.
Juan Bellot - One of the best experts on this subject based on the ideXlab platform.
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Observed and projected changes on Aquifer Recharge in a Mediterranean semi-arid area, SE Spain
Environmental Earth Sciences, 2019Co-Authors: Hassane Moutahir, M. Fernández-mejuto, J. M. Andreu, Issam Touhami, J. Ayanz, Juan BellotAbstract:Groundwater is the major water source in arid and semi-arid regions and its availability under future climatic scenarios is uncertain. In this context, the knowledge of the likely changes in Aquifer Recharge is very important for sustainable management of groundwater resources in these environments. This work assesses the effect of future potential changes in the climate variables on Aquifer Recharge in a Mediterranean semi-arid Aquifer (Sierra de Las Aguilas (SAG), SE Spain). We used monthly piezometric data to validate the Aquifer Recharge simulated by HYDROBAL ecohydrological model over the period 2001–2016. This model was then used to simulate the Aquifer Recharge over the historical period 1971–2000 and over two projected periods (2039–2068 and 2069–2098) using 18 downscaled climate projections. The results show that the percentage of Aquifer Recharge to precipitation (PAR) decreased significantly over the historical period (− 0.3% year−1, p
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Water Balance Estimation Under Wildfire and Restoration Scenarios in Semiarid Areas: Effects on Aquifer Recharge
Advances in Sustainable and Environmental Hydrology Hydrogeology Hydrochemistry and Water Resources, 2019Co-Authors: Hassane Moutahir, Issam Touhami, Aymen Moghli, Juan BellotAbstract:In semiarid areas, water is a crucial and limited resource and its management is a challenge. Hydrological models allow the estimation of water balance under different land cover and climate scenarios which can help improve the management of water resources. In this study, we used the “DISRUM” model (a Distributed Eco Hydrological Model) to estimate the water balance and Aquifer Recharge according to different scenarios of vegetation cover changes induced by wildfire and restoration during two hydrological years (wet and dry year) and determine the best scenarios that can substitute the current vegetation cover of a small Aquifer in the semiarid area of Southeastern Spain. The main results of the preliminary work show that the vegetation cover has a significant impact on Aquifer Recharge. Furthermore, reducing the vegetation cover or substituting pine by shrub gave positive results for the Aquifer Recharge.
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Likely effects of land use changes on the runoff and Aquifer Recharge in a semiarid landscape using a hydrological model
Landscape and Urban Planning, 2001Co-Authors: Juan Bellot, Andreu Bonet, J.r. Sánchez, E. ChirinoAbstract:Abstract A hydrological model for the estimation of the water balance components was developed for a semiarid landscape of Spain. These components were: the soil water content, the actual evapotranspiration ( E ta ), and both the Aquifer Recharge (deep drainage) and runoff, which reflected water Recharge, human use and soil erosion impacts. Combining the model predictions with the land cover vegetation units on the Aquifer Recharge area, created through a GIS (IDRISI), we compared the effects of some management policies on the deep drainage and runoff in five simulation scenarios. These scenarios included wildfires and vegetation management policies (afforestation and land abandonment). In order to implement the simulations, three precipitation levels were taken into account: mean annual rainfall in the area (300 mm), a wet year with 400 mm, and a very wet year (553 mm), where one of the rainfall events was an extreme rainfall event (153 mm), with a very high intensity. The results indicated that afforestation would produce a reduction of both the annual Aquifer Recharge and the runoff for the next 20 years and a wildfire would cause dramatic increases in the present Aquifer Recharge at current annual average precipitation. The results were not so marked if we took into account wet years and extreme rainfall events. Substantial variation occurred with the increased effect of wildfire on the risk of erosion at current annual average precipitation, but extreme precipitation during a wet year led to a higher erosion risk.
