Estimation Models for Soil Water Content and Rainfall in Andong

Abstract

Main objective of this study was to develop the models to estimate soil water content (WTR) and rainfall during four years in Andong with verification. Trigonometric function model (TFM), Fourier function model (FFM) and exponential function model (EFM) for soil water content (WTR) were developed. Gaussian function model (GFM) and sigmoid function model (SFM) for rainfall were developed. Amplitude of mean WTR from 10 cm to 50 cm was 12.64%. Range of periodicity according to period and soil depth was 660 days and 427 days, respectively. The deeper soil depth the shorter in WTR periodicity. Slope of accumulated rainfall change was the highest in 2009, the critical point was the earliest in 2011. Average RMSE of TFM, FFM, EFM, GFM and SFM was 1.352%, 1.356%, 2.117%, 21.37 mm and 27.09 mm, respectively, and average NSE was 0.696, 0.694, 0.857, 0.937 and 0.996, respectively. Four models (TFM, EFM, GFM and SFM) were deemed ｢very appropriate｣ and FFM was judged to be ｢appropriate｣ based on the criteria of error analysis.

Drought Assessment Using Standardized Precipitation Evapotranspiration Index, Standardized Precipitation Index and Soil Available Water Content

“…잠재증발산량 (  )의 계산에는 Penman-Monteith (Allen et al, 1998) -Serrano et al, 2010;Stagge et al, 2015). (Eom, 2021;Hwang et al, 2022). 토양유효수분율로 가뭄을 평가하는 기준은 60%를 기준으로 하며, 가뭄단계는 정상, 관심, 주의, 경계, 심 각 총 5단계로 구분한다 (Hwang et al, 2022).…”