Analysis of the Raingauge Network Design in Shih-men Reservoir Watershed
Date Issued
2009
Date
2009
Author(s)
Liu, Guan-De
Abstract
Abstracthe Shih-men Reservoir is one of the most important reservoirs for water supply in northern Taiwan. Owing to the characteristics of Shih-men Reservoir watershed (weak geologic condition, steep slopes, high mountains, high-intensity rainfall, and frequently occurred typhoon), its watershed management is urgent and necessary.he understanding of the characteristics of rainfall is the key for successful engineering design so that a reasonable raingauge network capable of providing reliable rainfall data is important to engineering design. The aim of this study is to show the results of different geostatistic methods for estimating the rainfall variation of Shih-men Reservoir watershed and to propose the optimum number and spatial distribution of raingauge network in the watershed.n order to evaluate the effectiveness of the geostatistic methods and the existing raingauge network, a network of 14 raingauges in Shih-men Reservoir watershed and the rainfall date between 1986 and 2007 were chosen for analysis. Three different geostatistic approach (Ordinary Kriging, Disjunctive Kriging and Detrend method) have been used as estimators and their results are compared and discussed. In this study, Ordinary Kriging seems to give the optimum results.urthermore, we use the method composed of Kriging and the maximum joint entropy approach to determine the optimum number and spatial distribution of raingauge network in the watershed. The result shows that only five raingauges could provide the enough information of Typhoon rainfall in Shih-men Reservoir watershed.
Subjects
Shih-men Reservoir Watershed
Kriging
Entropy
Raingauge Network
Type
thesis
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