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http://dx.doi.org/10.3741/JKWRA.2003.36.2.161

Optimization of Stream Gauge Network Using the Entropy Theory  

Yoo, Chul-Sang (고려대학교 토목환경공학과)
Kim, In-Bae (고려대학교 대학원 환경공학과)
Publication Information
Journal of Korea Water Resources Association / v.36, no.2, 2003 , pp. 161-172 More about this Journal
Abstract
This study has evaluated the stream gauge network with the main emphasis on if the current stream gauge network can catch the runoff characteristics of the basin. As the evaluation of the stream gauge network in this study does not consider a special purpose of a stream gauge, nor the effect from a hydraulic structure, it becomes an optimization of current stream gauge network under the condition that each stream gauge measures the natural runoff volume. This study has been applied to the Nam-Han River Basin for the optimization of total 31 stream gauge stations using the entropy concept. Summarizing the results are as follows. (1) The unit hydrograph representing the basin response from rainfall can be transferred into a probability density function for the application of the entropy concept to optimize the stream gauge network. (2) Accurate derivation of unit hydrographs representing stream gauge sites was found the most important part for the evaluation of stream gauge network, which was assured in this research by comparing the measured and derived unit hydrographs. (3) The Nam-Han River Basin was found to need at least 28 stream gauge stations, which was derived by considering both the shape of the unit hydrograph and the runoff volume. If considering only the shape of the unit hydrograph, the number of stream gauges required decreases to 23.
Keywords
Stream gauge network; optimization; unit hydrograph;
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