Impact of clayey soils on nitrate pollution in the groundwater of the lower Vanisadhara River basin, India
نویسندگان
چکیده
The main contributors of high nitrate concentrations in the groundwater of the Vanisadhara River basin are the point sources associated with livestock barns while the seasonal variations in nitrate (N03) concentrations are attributed to the prevailing hydrogeological conditions. The observed increase in nitrate under rising water level conditions, contradicting an expected decrease due to dilution by rainwater, is believed to be caused by the contribution of N03 from the clayey soil. The processes of sorption, retention and slow denitrification in clay are probably responsible for the contribution of nitrate to the groundwater in the post-monsoon season. The positive linear relationship between chloride and nitrate is in agreement with the similarities in behaviour of these ions in the clayey formations. Influence des sols argileux sur la pollution par les nitrates des eaux souterraines de l'aval du bassin de la Rivière Vanisadhara (Inde) Résumé La principale origine des importantes concentrations de nitrates observées dans les eaux souterraines du bassin de la Rivière Vamsadhara est constituée de rejets ponctuels provenant d'élevages tandis que les variations saisonnières des concentrations en nitrates peuvent être attribuées au contexte hydrogéologique. Nous pensons que l'accroissement anormal des teneurs en nitrates associé à l'élévation du niveau des eaux peut être attribué à un apport de nitrates provenant des sols argileux. Les processus d'adsorption, de rétention et de dénitrification lente dans les argiles sont probablement à l'origine d'un apport de nitrates dans les eaux souterraines dans la période suivant la mousson. La corrélation linéaire positive entre chlorures et nitrates est cohérente avec le comportement de ces ions dans les formations argileuses.
منابع مشابه
A Regression-Based Analysis to Assess the Impact of Fluoride Reach River Water on the Groundwater Aquifer Adjacent to the River: A Case Study in Bharalu River Basin of Guwahati, India
Fluoride is one of the parameters which is non-degradable and naturally occurring inorganic anion found in many natural streams, lakes, and groundwater. Serious problems are faced in several parts of India due to the high consumption of fluoride through drinking water. These may cause dental and skeletal fluorosis to humans. This study aims to examine the level of fluoride in both Bharalu river...
متن کاملA Regression-Based Analysis to Assess the Impact of Fluoride Reach River Water on the Groundwater Aquifer Adjacent to the River: A Case Study in Bharalu River Basin of Guwahati, India
Fluoride is one of the parameters which is non-degradable and naturally occurring inorganic anion found in many natural streams, lakes, and groundwater. Serious problems are faced in several parts of India due to the high consumption of fluoride through drinking water. These may cause dental and skeletal fluorosis to humans. This study aims to examine the level of fluoride in both Bharalu river...
متن کاملImpact of copper mines and smelter on groundwater quality (Case Study: Rajasthan State in India)
Rajasthan is one of the main mineral potential state of India. During the last 30 years it has witnessed enormous expansion of mining industries, but mining of most of the minor minerals coupled with changing climate has posed serious problems to the environmental fabric in the state, apart from base metal beneficiation plants. Groundwater is also being polluted day-by-day by effluents generate...
متن کاملDemarcation of Groundwater Prospective Zones in Humid Tropical River Basin: A Geospatial Approach
Groundwater, being a vital resource, needs to be developed with proper understanding about its occurrence in time and space. Unscientific sand mining is a dominant environmental issue in this humid tropical river basin namely Bharathapuzha river basin geographically on central part of Kerala state, southwest part of India. The sandy layers along the river course declines its water holding capac...
متن کاملEvaluation of Groundwater Chemistry of a Central Kerala River Basin, India using Multivariate Analysis
Statistical processing of data was necessary to arrive at a reasonable conclusion regarding the chemical behavior of groundwater in a river basin. Multivariate analysis was done to elucidate the groundwater chemistry of a Central Kerala River basin. Hydrochemical parameters like EC, pH, TDS, TH, Ca, Mg, Na, K, Cl, F, HCO 3 +CO 3 , SO 4 , total Fe were estimated in the pre- monsoon and post-mons...
متن کامل