Proposal of Agricultural Drought Re-evaluation Method using Long-term Groundwater Level Monitoring Data

ChanDuck Jeong; ByungSun Lee; GyuSang Lee; JunKyum Kim

doi:10.7857/JSGE.2021.26.4.027

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2021 Vol.26, Issue 4 Preview Page

Proposal of Agricultural Drought Re-evaluation Method using Long-term Groundwater Level Monitoring Data 장기 지하수위 관측자료를 활용한 농업가뭄 재평가 방안 제언

31 August 2021. pp. 27-43

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Abstract

Since climate factors, such as precipitation, temperature, etc., show repeated patterns every year, it can be said that future changes can be predicted by analyzing past climate data. As with groundwater, seasonal variations predominate. Therefore, when a drought occurs, the groundwater level is also lowered. Thus, a change in the groundwater level can represent a drought. Like precipitation, groundwater level changes also have a high correlation with drought, so many researchers use Standard Groundwater Level Index (SGI) to which the Standard Precipitation Index (SPI) method is applied to evaluate the severity of droughts and predict drought trends. However, due to the strong interferences caused by the recent increase in groundwater use, it is difficult to represent the droughts of regions or entire watersheds by only using groundwater level change data using the SPI or SGI methods, which analyze data from one representative observation station. Therefore, if the long-term groundwater level changes of all the provinces of a watershed are analyzed, the overall trend can be shown even if there is use interference. Thus, future groundwater level changes and droughts can be more accurately predicted. Therefore, in this study, it was confirmed that the groundwater level changes in the last 5 years compared with the monthly average groundwater level changes of the monitoring wells installed before 2015 appeared similar to the drought occurrence pattern. As a result of analyzing the correlation with the water storage yields of 3,423 agricultural reservoirs that do not immediately open their sluice gates in the cases of droughts or floods, it was confirmed that the correlation was higher than 56% in the natural state. Therefore, it was concluded that it is possible to re-evaluate agricultural droughts through long-term groundwater level change analyses.

Keywords

Groundwater

Groundwater level

SPI

SGI

Drought

Agricultural drought

References

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Information

Publisher :The Korean Society of Soil and Groundwater Environment
Publisher(Ko) :한국지하수토양환경학회
Journal Title :Journal of Soil and Groundwater Environment
Journal Title(Ko) :지하수토양환경
Volume : 26
No :4
Pages :27-43
Received Date : 2021-07-30
Revised Date : 2021-08-04
Accepted Date : 2021-08-19
DOI :https://doi.org/10.7857/JSGE.2021.26.4.027

Journal of Soil and Groundwater Environment ISSN:1598-6438(Print) 2287-8831(Online) 지하수토양환경

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References