Analysis of the Changing of Drainage Basin Sediment Yield and Sediment Budget
Date Issued
2005
Date
2005
Author(s)
Ming-Hsuan
DOI
zh-TW
Abstract
In order to solve the problem of excessive sediment accumulation in reservoirs in the country, officials have implemented numerous reservoir management plans. The results still show the situation of sediment accumulation under the reservoirs is still very severe. Sediment budget shows the correlation between the erosion of the materials, the flow of sediment, and the change in the storage of the sediment, and can help us to understand the sources of sediment. Meanwhile, rating curve can be used to measure the suspended load of the drainage basin outlet. This research would use the above two methods in the area of both Kao-Yi and Hsia-Yun hope to understand the affective potential factors and sources of sediment yield, thus provide a reference for future reservoir management projects.
Using the Hydrological Year Book of Taiwan form 1965 to 2002 published by Water Resources Agency, Ministry of Economic Affairs, it shows the daily discharge and suspended load from 2 stations, Kao-Yi and Hsia-Yun. Use SPSS statistics software to decide the most appropriate rating curve, and then researchers can calculate annual sediment yield of both Kao-Yi and Hsia-Yun stations. First, by using statistic methods such as correlation analysis, regression analysis, and box-and-whisker plot from ANOVA analysis, one can analyze the chronological sediment yield and its possible causes. In addition, establish the annual sediment yield relationship of Kao-Yi and Hsia-Yun before the construction of Jung-Hua Dam, and then use this relationship to presume Hsia-Yun original annual sediment if Jung-Hua Dam was not built. Finally, we can compare Hsia-Yun annual sediment yield from original and post- construction of Jung-Hua Dam, and see the differences, then compare it to real measure annual sediment yield found in Jung-Hua Dam, we then can do a further analysis on sediment budget.
Analysis found that typhoons and peak discharge triggered by it are the main factors that cause the change in Kao-Yi and Hsia-Yun annual sediment yield, and management plans for the Shih-Men Reservoir drainage basin, especially the constructions of check dam, have effectively reduced the annual sediment yield. By the way, the increases areas of landslide and landuse of orchard around the research area shall increase downstream sediment yields, but actually is decreasing year by year, show that the increases of sediment yields still remain in the research area.
Analysis of sediment budget show before the construction of Jung-Hua Dam 1983, downstream sediment yields of Hsia-Yun are more than upstream sediment yields of Kao-Yi subtract check dam, then we can assume sediment yields produced by the slope, channel bank, channel itself and the valley storage in the drainage basin between Kao-Yi and Hsia-Yun were delivered to Hsia-Yun station. The decades after the construction of Jung-Hua Dam, maybe the management plans for the Shih-Men Reservoir drainage basin, or sediment yield produced by the slope, channel bank and channel itself may temporally remain in the drainage basin channel between Kao-Yi and Hsia-Yun, so sediment yields of Hsia-Yun are relatively decrease before the construction of Jung-Hua Dam. But the actually condition still need further research and measure.
Keywords: sediment yield、rating curve、sediment budget、
Shih-Men Reservoir
Subjects
輸砂量
率定曲線
沖積物預算
石門水庫
sediment yield
rating curve
sediment budget
Shih-Men Reservoir
Type
thesis
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