Department of Water Resources Development and Management, Indian Institute of Technology Roorkee, Roorkee-247667, India.
Environ Monit Assess. 2023 Aug 1;195(8):1014. doi: 10.1007/s10661-023-11586-y.
Managed aquifer recharge (MAR) is a promising adaptation measure to reduce vulnerability to climate change and hydrological variability. However, in areas where the basin is highly polluted, densely populated, and intensely cultivated, implementing suitable MAR strategies is a significant challenge. This study used a geographic information system-based multicriteria decision analysis (GIS-MCDA) approach to delineate the MAR potential sites using seven thematic layers describing surface and subsurface features. Further, basin-specific MAR approach was developed using information such as polluted water areas, canal network distribution for water supply, and cropping patterns. The results of this study indicate that only 17% of the area is highly suitable, while 54% and 29% were found moderately suitable and unsuitable for the MAR approach. Since most highly and moderately suitable sites were falling in the agricultural areas, agricultural-based MAR (AgMAR) was considered a preferred option. AquaCrop model for sugarcane was developed considering excess canal water supply during the grand growth stage to understand the AgMAR potential in the study area. It was observed that the potential recharge under normal irrigation scenarios varies from 135.5 to 272 mm/year, which can be increased through AgMAR up to 545 mm/year depending on the water availability for excess irrigations. This study provides an improved understanding of the parameters that should be considered for MAR site selection and post-GIS-MCDA analysis to assess the basin-specific MAR strategy.
含水层人工补给 (MAR) 是一种很有前途的适应气候变化和水文变异性的措施。然而，在流域高度污染、人口密集和集约化种植的地区，实施合适的 MAR 策略是一个重大挑战。本研究使用基于地理信息系统的多准则决策分析 (GIS-MCDA) 方法，利用描述地表水和地下水特征的七个专题层来划定 MAR 潜力区。此外，还利用受污染水域、供水管网分布和种植模式等信息，制定了特定于流域的 MAR 方法。研究结果表明，只有 17%的地区高度适宜，而 54%和 29%的地区则为中度适宜和不适宜。由于大多数高度和中度适宜的地区都在农业区，因此农业型 MAR（AgMAR）被认为是一个首选方案。针对甘蔗开发了 AquaCrop 模型，考虑了在大生长阶段过剩渠水供应，以了解研究区的 AgMAR 潜力。观察到，在正常灌溉情景下，潜在补给量在 135.5 至 272mm/年之间，而通过 AgMAR 可增加至 545mm/年，具体取决于过量灌溉的可用水量。本研究提高了对 MAR 选址和 GIS-MCDA 分析后应考虑的参数的认识，以评估特定于流域的 MAR 策略。
