Regional-Scale Evaluation of Groundwater Susceptibility to Nitrate Contamination Based on Soil Survey Information

토양정보를 이용한 광역 지하수의 질산태 질소 오염 민감도 분포 분석

  • 한광현 (충북대학교 응용생명환경학부)
  • Received : 2009.01.02
  • Accepted : 2009.02.06
  • Published : 2009.02.28

Abstract

Susceptibility assessment of groundwater contamination is a useful tool for many aspects of regional and local groundwater resources planning and management. It can be used to direct regulatory, monitoring, educational, and policy-making efforts to highly vulnerable areas. In this study, a semi process-based was proposed to evaluate relative susceptibilities to groundwater contamination by nitrate on a regional scale. Numerical simulation based on data from each soil series was done to model water flow within soil profiles that were related to groundwater contamination by nitrate. Relative vulnerability indices for each soil series were produced by manipulation of amount of leaching flux, amount of average water storage in a soil profile, and amount of average water storage change. These indices were designed to convey the trend of leaching flux and to maximize spatial resolution. The resulting vulnerability distribution map was used to locate highly vulnerable sites easily with an appropriate grouping the indices, and was then compared with those from groundwater nitrate concentrations monitored. An excellent agreement was obtained across nitrate concentrations from the highly vulnerable regions and those from the low to stable regions.

Keywords

Water movement;Simulation;Soil series;Pedotransfer function;Geographical information system

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