In this study, we investigate submarine groundwater discharge (SGD) and the influence which coastal geomorphology and geology can have on its behavior. Numerical models have been developed to estimate the magnitude of submarine groundwater discharge (SGD) from catchments with different geomorphology on the Southwest coast of India. Two coastal catchments of Thiruvananthapuram district, Kerala, India namely Varkala (184 km²) and Kadinamkulam (186 km²), have been selected to compute SGD. The results of the study confirmed that the SGD flux from the catchments differs in a great way across its multiple layers as well as in comparison to one another. The fresh SGD flux from Varkala catchment is found to be 0.1 m³/day/m and from Kadinamkulam catchment is 6 m³/m/day. In the present study, it is concluded that SGD is reflected in the heterogeneity of aquifers owing to the differences in geomorphology, land use-land cover, hydrogeology, and lithology. A numerical modeling approach that can yield reliable results with low computational cost and time is a potent method for quantifying SGD. The inferences drawn will be useful for designing aquifer recharge options and optimum pumping quantities for the region.

在这项研究中，我们调查了海底地下水排放 (SGD) 以及沿海地貌和地质对其行为的影响。已经开发了数值模型来估计来自印度西南海岸具有不同地貌的集水区的海底地下水排放量 (SGD)。已选择印度喀拉拉邦蒂鲁文南特布勒姆地区的两个沿海集水区，即 Varkala (184 km ² ) 和 Kadinamkulam (186 km ² ) 来计算 SGD。研究结果证实，流域的 SGD 通量在其多层之间以及彼此之间的比较中存在很大差异。发现来自 Varkala 流域的新鲜 SGD 通量为 0.1 m ³ /day/m，来自 Kadinamkulam 流域的新 SGD 通量为 6 m³ /米/天。在本研究中，由于地貌、土地利用-土地覆盖、水文地质和岩性的差异，SGD 反映在含水层的异质性上。一种能够以较低的计算成本和时间产生可靠结果的数值建模方法是量化 SGD 的有效方法。得出的推论将有助于设计该地区的含水层补给方案和最佳抽水量。