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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/17570

Title: 集水區環境變遷對河川流量的影響
The Impacts of Environmental Changes on Stream Flow
Authors: 詹仕堅
Contributors: 地理學系
Keywords: 921地震;環境變遷;河川流量;類神經網路
Chi-Chi earthquake;Environmental changes;Discharge;Artificial neural network
Date: 2007
Issue Date: 2013-12-03T03:11:01Z
Publisher: 行政院國家科學委員會
Abstract: 發生於1999年的921大地震使中部河川集水區的地文環境受到很大衝擊,水文特性也可能產生重大變化。本研究以濁水溪支流清水溪集水區為對象,透過遙測影像判釋與GIS技術的應用,顯示921地震使集水區崩塌地與裸露地面積明顯增加,隨後因為自然復原與人工復育而逐漸減少。在水文分析部份,本研究使用1965~2007年的日雨量、日流量資料為基礎,透過年平均、豐枯水期、高低流量等項目水文量的統計與時期比較,得知清水溪在921地震之後的河川流量有增加的現象,而導致流量增加的原因不僅是年雨量與豐水期雨量的增加,集水區地文環境改變也可能是重要的影響因素。地文環境改變的項目中,除了地震造成的土地覆蓋/利用變遷之外,控制入滲與地表下逕流特性的地文因子也可能因為地震而有所變化,後者推斷是枯水期流量增加的主因。根據年最大日雨量、流量進行的頻率分析顯示,清水溪集水區在1990年以後,相同規模的極端雨量與極端流量發生機率有降低的趨勢,可能與氣侯變遷有關,有待未來進一步加以研究;地震後時期之相同規模極端雨量發生機率與1990~1998年時期沒有明顯差別,但是極端流量發生機率在2000年之後持續降低,應與921地震造成的地文環境變遷有關。本研究亦使用類神經網路技術建構日尺度的降雨-逕流模式,推估沒有921地震衝擊下1999~2001年的可能日流量,並與地震後的實測流量相比較,結果同樣顯示921地震會導致清水溪河川流量增加。
The Chi-Chi earthquake in 1999, magnitude 7.3 was measured, made eventful impacts on the environment of river basins in central Taiwan. The Chin-Shui watershed, a sub-basin of Cho-Shui river basin, was selected to be the study area in this project. The statistical analysis indicated that the discharge increased after the earthquake whatever in the annual average, wet season, dry season, high discharge events or low discharge events. The increasing rainfall was not the only reason. It might be concerned with the changes of land use/cover and the water transmission capacity in the subsurface also. The main evidence is that the increasing discharge was coupling with decreasing rainfall in the dry season and low discharge events in those post-earthquake years. A rainfall-runoff model had been established by using artificial neural network. This model was used to estimate the daily discharge assumed there was no Chi-Chi earthquake. The difference between the modeling output and the real observations could be regarded as the impact of the earthquake. The results showed the increasing discharge affected by the earthquake too.
Relation: 國科會計畫, 計畫編號: NSC96-2116-M018-002; 研究期間: 9608-9707
Appears in Collections:[地理學系] 國科會計畫

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