The present study focused on the estimation of submarine groundwater discharge(SGD)and the effects of nutrient fluxes due to the SGD process.The parameters of SGD such as magnitude,character,and nutrient flux in Punna...The present study focused on the estimation of submarine groundwater discharge(SGD)and the effects of nutrient fluxes due to the SGD process.The parameters of SGD such as magnitude,character,and nutrient flux in Punnakayal region of South East coast of India were evaluated using multiple tracers of groundwater inputs in 2019.It was found that the elevated values for the tracers in the study area,displayed a gradational change in the values as move from estuarine part to the offshore.Simultaneous occurrence of fresh and saline SGD is observed on the study sites.Also,indicated that the SGD fluxes ranged from 0.04 to 0.12 m^3 m^-2d^-1 at the estuary and0.03-0.15 m^3 m^-2d^-1at the groundwater site.A substantially increased value for 222 Rn activities is distinguished in the estuary to values over 312 dpm L^-1.Nutrient embellishments were generally greatest at locations with substantial meteoric elements in groundwater;however,the recirculation of saltwater through the geological formation could provide a way of transferring terrestrially-derived nutrients to the coastal zone at many places.展开更多
Monitoring of groundwater quality on a regular basis is essential for use in the domestic,agricultural and industrial sectors.Further,it is even more important in rural areas where people make use of groundwater for d...Monitoring of groundwater quality on a regular basis is essential for use in the domestic,agricultural and industrial sectors.Further,it is even more important in rural areas where people make use of groundwater for domestic purposes without prior treatment.This study was carried out with the objective of assessing the groundwater quality based on electrical conductivity(EC),fluoride,nitrate and bromide in a part of Nalgonda district,Andhra Pradesh,southern India.Groundwater samples were collected from 45 locations in January 2010.They were analysed using an ion chromatograph for fluoride,bromide and nitrate concentration in groundwater.EC was measured in the field using a portable digital probe.The groundwater samples were not suitable for drinking and domestic use based on EC,fluoride,nitrate and bromide in 6.7,57,22 and 11%of the locations,respectively.Overall,31%of the locations had suitable groundwater quality.The north-eastern and south-eastern parts of this area had unsuitable groundwater.A total of 378.68 km2 had unsuitable groundwater for drinking and domestic purposes.The source for the increased concentration of these parameters is varied and hence it is essential to restore the groundwater quality in this area.Of the several techniques available,artificial recharge by rainwater harvesting will help to dilute the concentration of these ions and improve the groundwater quality.展开更多
基金the financial support by the Department of Science and Technology-SERB-ECRGovernment of India,New Delhi(Grant No:F:ECR/2018/001749)。
文摘The present study focused on the estimation of submarine groundwater discharge(SGD)and the effects of nutrient fluxes due to the SGD process.The parameters of SGD such as magnitude,character,and nutrient flux in Punnakayal region of South East coast of India were evaluated using multiple tracers of groundwater inputs in 2019.It was found that the elevated values for the tracers in the study area,displayed a gradational change in the values as move from estuarine part to the offshore.Simultaneous occurrence of fresh and saline SGD is observed on the study sites.Also,indicated that the SGD fluxes ranged from 0.04 to 0.12 m^3 m^-2d^-1 at the estuary and0.03-0.15 m^3 m^-2d^-1at the groundwater site.A substantially increased value for 222 Rn activities is distinguished in the estuary to values over 312 dpm L^-1.Nutrient embellishments were generally greatest at locations with substantial meteoric elements in groundwater;however,the recirculation of saltwater through the geological formation could provide a way of transferring terrestrially-derived nutrients to the coastal zone at many places.
基金The authors would like to acknowledge the Board of Research in Nuclear Sciences,Department of Atomic Energy and government of India for funding this work(Grant No.2007)Authors also like to thank the Department of Science and Technology’s Funds for Improvement in Science and Technology scheme(Grant No.SR/FST/ESI-106/2010)University Grants Commission’s Special Assistance Programme(Grant No.UGC DRS II F.550/10/DRS/2007(SAP-1))for their support in creating laboratory facilities,which helped in carrying out part of this work.
文摘Monitoring of groundwater quality on a regular basis is essential for use in the domestic,agricultural and industrial sectors.Further,it is even more important in rural areas where people make use of groundwater for domestic purposes without prior treatment.This study was carried out with the objective of assessing the groundwater quality based on electrical conductivity(EC),fluoride,nitrate and bromide in a part of Nalgonda district,Andhra Pradesh,southern India.Groundwater samples were collected from 45 locations in January 2010.They were analysed using an ion chromatograph for fluoride,bromide and nitrate concentration in groundwater.EC was measured in the field using a portable digital probe.The groundwater samples were not suitable for drinking and domestic use based on EC,fluoride,nitrate and bromide in 6.7,57,22 and 11%of the locations,respectively.Overall,31%of the locations had suitable groundwater quality.The north-eastern and south-eastern parts of this area had unsuitable groundwater.A total of 378.68 km2 had unsuitable groundwater for drinking and domestic purposes.The source for the increased concentration of these parameters is varied and hence it is essential to restore the groundwater quality in this area.Of the several techniques available,artificial recharge by rainwater harvesting will help to dilute the concentration of these ions and improve the groundwater quality.
