Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Parameter Calibrations of a Daily Rainfall-Runoff Model Using Global Optimization Methods

전역최적화 기법을 이용한 강우-유출모형의 매개변수 자동보정

  • Published : 2002.10.01
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Abstract

Two global optimization methods, the SCE-UA method and the Annealing-Simplex(A-S) method for calibrating a daily rainfall-runoff model, a Tank model, was compared with that of the Downhill Simplex method. In synthetic data study, 100% success rates for all objective functions were obtained from the A-S method, and the SCE-UA method was also consistently able to obtain good estimates. The Downhill Simplex method was converged to the true values only when the initial guess was close to the true values. In the historical data study, the A-S method and the SCE-UA method showed consistently good results regardless of objective function. An objective function was developed, which puts more weight on the low flows.

본 연구에서는 전체탐색기법 중 Simplex법의 원리를 이용한 SCE-UA법과 Annealing-Simplex (A-S)법을 일유출량 추정 수문모형인 탱크모형의 매개변수 보정에 적용하여 국부탐색기법인 Downhill Simplex법의 결과와 비교하여 탐색능력을 평가하였다. 오차가 없는 합성자료를 사용한 보정에서 A-S법이 목적함수에 관계없이 전역최적해를 탐색하는 결과를 나타냈으며, SCE-UA법은 ABSERR를 목적함수로 사용할 경우에 전역최적해를 탐색하는 결과를 나타냈으며, 다른 목적함수를 사용하는 경우에는 최적해에 가까운 탐색결과를 나타냈다. Downhill Simplex법은 초기값에 따라 다근 탐색결과를 나타냈으며, 최적해에 가까운 초기값을 사용할 경우 전역 최적해를 탐색하는 결과를 나타냈다. 실측자료를 사용한 보정에서는 A-S법과 SCE-UA법이 목적함수에 관계없이 양호한 결과를 나타냈다. 두 개의 서로 다른 단일 목적함수를 조합하여 만든 목적함수 중 DRMS와 NS의 조합에 의해 만들어진 목적함수인 DN이 다른 목적함수보다 저유량에 비중을 더 둔 예측결과를 나타냈으며, 전체 자료기간에 대해서 양호한 예측결과론 나타냈다.

Keywords

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