Jesiya N P, Gopinath Girish, Resmi T R
Geomatics Division, Centre for Water Resources Development and Management (CWRDM), Kerala, 673571, India.
Geomatics Division, Centre for Water Resources Development and Management (CWRDM), Kerala, 673571, India; Department of Remote Sensing & GIS, Kerala University of Fisheries and Ocean Studies (KUFOS), Kochi, 682 508, India.
J Environ Manage. 2021 Jun 1;287:112260. doi: 10.1016/j.jenvman.2021.112260. Epub 2021 Mar 12.
Unscientific urbanization in coastal cities has enforced the need for understanding groundwater recharge sources and processes for sustainable development. In this paper, stable isotope compositions of precipitation, groundwater and river water were determined to understand the significant recharge sources of phreatic aquifers in the two differently urbanized environments, viz. urban and peri urban clusters of Kozhikode District, Kerala, and southern India. The two monsoon systems viz., southwest and northeast, are the major source of groundwater recharge in the region, but due to change in landuse pattern in the last decade has significantly altered groundwater recharge. Hence with the aid of stable isotope ratios of water, estimation of point recharge of rainwater to the groundwater in different hydrgeological setting of the area was done. The monsoon rains contributed 35% in the urban alluvial aquifers, up to 39% in the urban laterite aquifer and 42% in the peri urban laterite aquifer. An attempt was made to correlate the landuse changes in the past decade in the region with the groundwater availability.
沿海城市不科学的城市化进程凸显了理解地下水补给源和过程以实现可持续发展的必要性。本文测定了降水、地下水和河水的稳定同位素组成，以了解印度南部喀拉拉邦科泽科德区两个不同城市化环境（即城市和城郊集群）潜水含水层的重要补给源。西南季风和东北季风这两个季风系统是该地区地下水补给的主要来源，但过去十年土地利用模式的变化显著改变了地下水补给。因此，借助水的稳定同位素比率，对该地区不同水文地质环境中雨水对地下水的点补给量进行了估算。季风降雨在城市冲积含水层中的贡献率为35%，在城市红土含水层中高达39%，在城郊红土含水层中为42%。本文还尝试将该地区过去十年的土地利用变化与地下水可利用量联系起来。
