Comparative Analysis of the Vulnerable Period of Groundwater Level Drawdown
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-1772-9
Water Resources and Hydrologic Engineering
Comparative Analysis of the Vulnerable Period of Groundwater Level Drawdown Jae-Beom Lee
a
and Jeong-Seok Yang
b
a
Dept. of Civil Engineering, Kookmin University, Seoul 02707, Korea Member, Dept. of Civil Engineering, Kookmin University, Seoul 02707, Korea
b
ARTICLE HISTORY
ABSTRACT
Received 1 October 2019 Accepted 3 June 2020 Published Online 28 August 2020
This study selected groundwater level as the factor to represent the changes in groundwater resources and developed an evaluation method for the management of monthly groundwater level considering the temporal variability with the target of 9 sub-basins located in the Namwon. For the evaluation of vulnerable period in the groundwater level considering the influence of rainfall on the underground aquifer, the following methods were used: applying effective rainfall amount based on the application of rainfall data, and using rainfall data with the notion of critical infiltration, among which vulnerable periods were compared for evaluations. A standard was developed for evaluating groundwater level; the weighting values were determined by using the entropy method, and the vulnerability period of groundwater resources of each sub-basin was evaluated via multiple decision-making methods. The methods developed in this study are expected to make grounds for building measures for the effective spatiotemporal management of groundwater resources.
KEYWORDS Critical infiltration Effective rainfall Temporal vulnerability evaluation Groundwater level management Vulnerable period Entropy method
1. Introduction Along with global developments, water demand is increasing for various uses. In the current situation wherein global climatic changes are unavoidable (IPCC, 2013), changes in the rainfall pattern can affect the groundwater (Yang et al., 2005). The OECD Environmental Outlook 2050 (OECD, 2012), assuming that none of the new policies will be adopted for the alleviation of climatic changes, analyzed that the global water demand will increase by 55% until 2050 leading to 40% of the world population residing in water-scarce areas. Particularly, the fact that the water consumption is continuously growing today despite no significant changes in the surface water intake volume in the OECD countries since the 1980s is indicating that the proportion of water intake at the underground aquifer is increasing in the total water demand. Of the researches related to the use of water resources, studies on the development of vulnerability evaluation methods on the use of water resources were actively conducted. IPCC (2007) defined vulnerability as the potential amount of damages from natural disasters or coping ability occurring in the unit of a basin.
CORRESPONDENCE Jeong-Seok Yang ⓒ 2020 Korean Society of Civil Engineers
[email protected]
Utilizing the notion of vulnerability, the research on the development of evaluation methods of the sur
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