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이희주,유양규,이재형 全北大學校 附設 都市및環境硏究所 2000 都市 및 環境硏究 Vol.15 No.1
The purpose of this paper is an attempt to carry out Low flow analysis using the Physically based distribution function. The Physically based distribution function is derived in terms of base-flow recession. The derived distribution function contains four parameters. Two of the parameters are determined from recession analysis of low flow. The other two are derived from a statistical analysis of the maximum length of rainless periods when precipitation is less than a assumed threshold value. The Physically distribution function with the same parameters can be applied to calculating mean low flow for 1, 5, 10 and 15 days of durations. It is applied and tested for low flow in Yongdam basin.
전일권,유양규,김운중 朝鮮大學校 建設技術硏究所 1999 建設技術硏究 Vol.19 No.1
It is essential to estimate the spatial distribution of the rainfall for the effective water resources management in flood season. In hydrological practice, the estimation of the spatial distribution of the rainfall has been executed by Thissen method which use surface raingauge data. But the surface rain- gauge data do not have the spatial continuity. The use of meteorological radar is very useful to improvement the defect. Therefore, a rainfall estimation method was studied which simultaneously use the meteorological radar data and the surface raingage data in this paper. At first, the theoretical radar principles and the empirical method to establish the relationship between radar reflectivity and rainfall rate was described. And the quality test method of the radar data and the coordinate conversion method was examined. Due to all of the principles and methods mentioned above, the relationship between radar reflectivity and rainfall rate was estimated and tested from the data measured on the Chungju multipurpose dam basin in 1993. As the result of the test, two set of relation coefficients were estimated at two raingauge sites, Sangdong A=30.12, β=1.2923 and Jinbu A=22.07, β=1.3693. The radar rainfall estimation method studied in this paper is very helpful to get the spatial distribution of flood rainfall and to forecast the flood flow.