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http://dx.doi.org/10.3741/JKWRA.2019.52.9.615

An analysis of runoff characteristic by using soil moisture in Sulma basin  

Kim, Kiyoung (Korea Institute of Hydrological Survey, Research & Development Division)
Lee, Yongjun (Korea Institute of Hydrological Survey, Research & Development Division)
Jung, Sungwon (Korea Institute of Hydrological Survey)
Lee, Yeongil (Korea Institute of Hydrological Survey, Research & Development Division)
Publication Information
Journal of Korea Water Resources Association / v.52, no.9, 2019 , pp. 615-626 More about this Journal
Abstract
Soil moisture and runoff have very close relationship. Especially the water retention capacity and drainage characteristics of the soil are determined by various factors of the soil. In this study, a total of 40 rainfall events were identified from the entire rainfall events of Sulma basin in 2016 and 2017. For each selected events, the constant-K method was used to separate direct runoff and baseflow from total flow and calculate the runoff coefficient which shows positive exponential curve with Antecedent Soil Moisture (ASM). In addition to that, the threshold of soil moisture was determined at the point where the runoff coefficient starts increasing dramatically. The threshold of soil moisture shows great correlation with runoff and depth to water table. It was founded that not only ASM but also various factors, such as Initial Soil Moisture (ISM), storage capacity of soil and precipitation, affect the results of runoff response. Furthermore, wet condition and dry condition are separated by ASM threshold and the start and peak response are analyzed. And the results show that the response under wet condition occurred more quickly than that of dry condition. In most events occurred in dry condition, factors reached peak in order of soil moisture, depth to water table and runoff. However, in wet condition, they reached peak in order of depth to water table, runoff and soil moisture. These results will help identify the interaction among factors which affect the runoff, and it will help establish the relationship between various soil conditions and runoff.
Keywords
Soil moisture; Runoff; Rainfall; Response time;
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Times Cited By KSCI : 1  (Citation Analysis)
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