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題名 | 隨機流域地形演化模擬=Random Watershed Topography Evolution Modeling |
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作者 | 陳樹群; 陳聯光; Chen, Su-chin; Chen, Lien-kuang; |
期刊 | 臺灣水利 |
出版日期 | 19970300 |
卷期 | 45:1=177 1997.03[民86.03] |
頁次 | 頁87-98 |
分類號 | 436.124 |
語文 | chi |
關鍵詞 | 隨機河系網; 坡地耦合作用; 向源侵蝕; 地形演化; Random channel networks; Coupled system of hillslope; River head incision; Topography evolution; |
中文摘要 | 隨機流域地形演化之主要機制可分為降雨漫地流沖蝕、向源頭侵蝕切割及模擬大 規模土砂堆移擴散之坡地耦合作用。本研究假設在一集水區內之地文、水文、土壤、地質和 植被等因子為均一的條件下,於一傾斜地形平臺上套疊隨機法則建構之河系網,以此隨機河 系網為地形演化初期漫地流匯流之水流主要方向,再依隨機流域地形演化之三個主要機制, 以電腦數值模擬隨時間而演化之地形。由量測地形演化階段指標之面積百分率和高度百分率 圖得知,模擬結果與真實地形演化過程一致;本研究在此引進坡地耦合週期的新觀念,以代 表地質的抗蝕能力,隨時間由不同地質情況模擬其流域縱斷面距離一高程關係結果顯示,耦 合週期小者,其土壤抗蝕能力差,反之耦合週網期大者,其土壤抗蝕能力強;另外,耦合週 期小者其地形演化終止達一新平面時間亦比耦合週期大者來得短和快速。 |
英文摘要 | Three major mechanisms that are runoff erosion, river head incision and coupled system of hillslope comprise the random watershed topography evolution mode. First, the pattern of river networks are constructed by random method and assume that the influence factors, e.g. morphology, hydrology, geology and vegetation are homogeneous in a inclined plane watershed. Then, topography evolution and river growth of the watershed are simulated by the above three mechanisms. From the hypsometric curves, this numerical model can favorably model the evolution of watershed. Coupled system of hillslope is a new concept in this field that can represent the erodibility of geology. Our results indicate the period of coupled system is small, the watershed is erodible, conversely, the period of coupled system is larger, the watershed is non-erodible. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。