Groundwater vulnerability assessment in shallow aquifer of Kathmandu Valley using GIS-based DRASTIC model |
| |
| Authors: | Dhundi Raj Pathak Akira Hiratsuka Isao Awata Luonan Chen |
| |
| Institution: | (1) Graduate School of Engineering, Osaka Sangyo University, 3-1-1 Nakagaito Daito, Osaka 574-8530, Japan |
| |
| Abstract: | In this paper, groundwater aquifer vulnerability map has been developed by incorporating the major geological and hydro-geological
factors that affect and control the groundwater contamination using GIS based DRASTIC model. This work demonstrates the potential
of GIS to derive a map by overlying various spatially referenced digital data layers that portrays cumulative aquifer sensitivity
ratings across the Kathmandu Valley, Nepal, providing a relative indication of groundwater vulnerability to contamination.
In fact, the groundwater is the major natural resources in Kathmandu for drinking purpose. The decline in groundwater levels
due to the over exploitation and thus extracted water from shallow aquifer has been contaminated by the infiltration of pollutants
from polluted river and land surface is continuous and serious. As the demand for water for human and industrial use has escalated
and at the same time, the engineering and environmental costs are much higher for new water supplies than maintaining the
existing sources already in use. Management of groundwater source and protecting its quality is therefore essential to increase
efficient use of existing water supplies. Aquifer vulnerability maps developed in this study are valuable tools for environmental
planning and predictive groundwater management. Further, a sensitivity analysis has been performed to evaluate the influence
of single parameters on aquifer vulnerability assessment such that some subjectivity can be reduced to some extent and then
new weights have been computed for each DRASTIC parameters. |
| |
| Keywords: | Groundwater vulnerability DRASTIC Sensitivity analysis Nepal GIS |
| 本文献已被 SpringerLink 等数据库收录！ |
|
