摘要
In coastal areas of our country,in spite of having excess rainfall(more than 3000 mm),groundwater become a rare commodity during summer.Number of researchers have discussed the issues related to water scarcity of coastal areas where there is a huge pressure on environment due to increased population,tourism,agriculture and industrial growth.Fast depletion of groundwater is also reported in coastal districts due to continuous discharge of direct runoff and also through subterranean flow which is termed as Submarine Groundwater Discharges(SGD).Large quantity of contaminants enter the ocean system through runoff.This necessitated a detailed investigation to understand the hydrological processes involved and the source of contaminants.The present investigation is an attempt to make quantitative and qualitative assessment of SGD based on hydrological,hydrogeological and hydrochemical components.Accordingly,water balance components were evaluated based on hydrological and hydrogeological investigations.Hydrochemical parameters were also evaluated to understand the impact of seawater intrusion in pre and post-monsoon of 2019.Study revealed that,there are signatures of considerable quantity of submarine groundwater discharge in parts of Honnavara,Kumta,Ankola and Karwar talukas.The influence of seawater in coastal aquifers is quite rare all along the coast of Uttara kannada district which is attributed to high groundwater recharge(15-20%)occurring in catchment areas.
