In view of the linear characteristic of Clark unit hydrograph, a distributed unit hydrograph representation was proposed in which the unit hydrograph for each derived isochrones of areas with Nash’s linear reservoir model can be established and then are overlaid in consideration of lag-routing time. Calculus parameter in the distributed unit hydrograph model can be computed by two methods: integral or gradually arithmetic average. In association with the proposed distributed unit hydrograph model, the unit hydrograph in Yandu river watershed was calculated and the result is consistent with that computed using Clark method by others. The result suggests that the improvement on Clark unit hydrograph by distributed representation in this article is reasonable, hence offering a foundation for further improvement in the application to hydrological response unit in the future.
Key words
Clark unit hydrograph /
linear characteristic /
isochronous cell /
improvement by distributed representation /
calculus parameter
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References
[1] ROSS C N. The Calculation of Flood Discharges by the Use of a Time Contour Plan[J]. Transactions of the Institution of Engineers, Australia, 1921, 2: 85-92.
[2] SHERMAN L K. Stream Flow from Rainfall by the Unit-Graph Method[J]. Engineering News Record, 1932, 108: 501-505.
[3] NASH J E. The Form of the Instantaneous Unit Hydrograph[J]. International Association of Scientific Hydrology, 1957, 3: 114-121.
[4] CLARK C O. Storage and the Unit Hydrograph[J]. Transactions of the American Society of Civil Engineers, 1945, 110(6): 1419-1446.
[5] MAIDMENT D R. Developing a Spatially Distributed Unit Hydrograph by Using GIS[C]∥KOVAR K, NACHTNEBEL H P. Application of Geographic Information Systems in Hydrology and Water Resources Management, Vienna, Austria, April 19-22, 1993: 181-192.
[6] 孔凡哲,李 燕,朱朝霞.一种基于面积-时间关系的单位线分析方法[J].中国矿业大学学报,2007,36(3):356-359.
[7] 朱朝霞,孔凡哲,刘 颖,等.基于流路坡度的分布式单位线应用研究[J].人民黄河,2009,31(10):84-85.
[8] 程双虎,胡春歧,马存湖.分布式单位线在河北雨洪模型中的应用[J].raybet体育在线
院报,2015,32(5):11-14.
[9] 唐郑亮,许有鹏,于瑞宏.流域汇流的等流时单位线方法初探[J].南京大学学报(自然科学版),2008,44(3):304-309.
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