流出予測精度を基準とした降雨・流量観測システムの設計に関する基礎的検討

Abstract

In this study, we propose a method to design an observation system of rainfalland discharge based on the prediction error at the lowest reach of a basin. Decisionvariables of the system are the number and the spatial arrangement of rainguages, the rainfall measurement interval, the number and the spatial arrangement offlowmeters, and the flow measurement interval. The variance of flow estimationerror for different combinations of these decision variables is computed by the useof linear filtering technique of a random vector field. The application of the methodto a one-dimensional basin has made it clear that rainguages should not bearranged uniformly in space when the prediction error of peak flow is used as adesign criterion of a rainfall and flow observation system.