추정오차분석을 통한 최적 강우관측망 구축에 대한 연구

To construct the efficient rain gauge network, we examine the spatial distribution characteristics of the rain gauge for study basin and propose the method to determine the optimal number of rain gauge and location by analyzing the estimation error of the AAR(Areal Average Rainfall). The spatial characteristic of the rain gauge network is evaluated by using the NNI(Nearest Neighbor Index), while the arithmetic mean method, Thiessen’s weighting method and the estimation theory are applied to calculate the AAR. As a result, even after re-establishing the rain gauge networks for the study basin, the well distributed networks produce a smaller estimation error compared to a clustered rain gauge network when calculating the AAR. When establishing a new rain gauge network in a watershed, both the density and the spatial distribution of the rain gauge stations must be taken into consideration. Considering the maintenance and financial aspect, it is found that the rain gauge networks with proper spatial distributions are able to obtain a more accurate AAR despite having less rain gauge stations, It is verified that it is possible to maintain the current accuracy level despite maintaining 18 out of 20 of the rain gauge stations. Therefore, the methods suggested in this study can be applied to establish a proper and efficient rain gauge network.