Evaluation of Raingauge Network using Area Average Rainfall Estimation and the Estimation Error

Abstract

Area average rainfall estimation is important to determine the exact amount of the available water resources and the essential input data for rainfall-runoff analysis. Like that, the necessary criterion for accurate area average rainfall estimate is the uniform spatial distribution of raingauge network. In this study, we suggest the spatial distribution evaluation methodology of raingauge network to estimate better area average rainfall and after the suggested method is applied to Han River and Geum River basin. The spatial distribution of rainfall network can be quantified by the nearest neighbor index. In order to evaluate the effects of the spatial distribution of rainfall network by each basin, area average rainfall was estimated by arithmetic mean method, the Thiessen's weighting method and estimation theory for 2013's rainfall event, and evaluated the involved errors by each cases. As a result, it can be found that the estimation error at the best basin of spatial distribution was lower than the worst basin of spatial distribution.

Influence of the Spatial Distribution of a Raingage Network on the Estimation of Areal Average Rainfall : Focusing on Thiessen's Weighting Method

“…공간적 분석특성 파악 및 추정오차 산정을 위한 이론적 배 경은 Yoo et al(2011), Lee et al(2013), Lee and Jun(2014a), Lee and Jun(2014c), Lee et al(2014) (Getis, 1964;Yoo and Jung, 2001 (KRIHS, 2004;Lloyd, 2006). 두 지점간의 거리를 측정하여 분포특성을 파악한다는 점에서 정방구역 방법에 비해 보다 지리적인 접근방법이라 할 수 있다 (Choi, 2007).…”

Evaluation for the Correction of Radar Rainfall Due to the Spatial Distribution of Raingauge Network

“…2.1 최근린 지수의 이론적 배경 공간분포 특성 및 설치고도를 평가하기 위한 이론적 배경은 Lee et al(2013), Lee and Jun(2014a)의 연구내용을 참조하여 재정리하였다. 일반적으로 자연현상은 대부분 포아송 분포를 따르는 것으로 알려져 있다 (Getis, 1964 (Getis, 1964;Yoo et al, 2011a).…”

“…현재로서는 강우관측망 평 가를 위한 정량화된 이론적 방법은 없으나, 강우관측소의 운 영목적에 따라 지역별, 사례별로 강우관측망을 평가되어야 함 은 당연하다. 일반적으로 강우량의 정도 있는 추정을 고려하 면 강우관측소는 공간적으로 균등하게 설치된 경우가 가장 이상적이라 할 수 있다 (Yoo et al, 2011a;Lee et al, 2013;Lee and Jun, 2014a;Lee and Jun, 2014b). Kim et al(2007), Lee et al(2013), Lee and Jun(2014a) …”

Assessment of a Stream Gauge Network Using Upstream and Downstream Runoff Characteristics and Entropy

“…Therefore, the importance of stream gauge stations is increasing day by day. However, issues can arise that limit the effectiveness of such systems, such as the uneven distribution of stations in a network area, and the lack of data sharing between stations, which lead to the duplication of gauging [ 3 ]. Due to this, countries are making continual efforts to establish a plan for producing and providing diverse hydrological information on a real-time basis.…”