강우관측소의 공간분포가 면적평균강우량 산정에 미치는 영향 검토: 티센가중법을 중심으로

This study has evaluated how affect it is the spatial distribution characteristics of rainfall network for estimation of areal average rainfall.
In addition, we reviewed whether it has any problem on Thiessen’s weighting method which is used commonly in domestic when the spatial distribution of raingauge network is distorted. For that, the raingauge network is rearranged using the nearest neighbor index and the estimation error is estimated to rearranged raingauge network. Area average rainfall was estimated by arithmetic mean method, the Thiessen’s weighting method and estimation theory for rainfall events. As a result, it found that the estimation error of area average rainfall is large on the distorted spatial distribution of raingauge network. Specially, it analyzed that Thiessen’s weighting method occurred more larger estimation error of areal average rainfall than the arithmetic mean method on the distorted spatial distribution of raingauge network. Accuracy of the areal average rainfall is related with the density of the raingauge network besides the spatial distribution and it will be difficult to estimate the high accuracy of areal average rainfall even though the density of raingauge network on the distorted spatial distribution of raingauge network.