論文名稱：堤岸邊坡破壞對河川寬度及深度之影響- 以草嶺崩坍區河道為例

Effect of Riverbank Failure on the River Width Adjustment -
a case study on the Chin-Sui River at the Tsao-Ling Landslide area

指導教授：廖志中 Jyh-Jong Liao

摘要

由現地觀測結果顯示，河岸邊坡穩定性分析對於崩塌區河道有明顯的影響，河川在河道邊坡破壤後，將使得河寬、河深、水流速度及河道斷面等發生改變。
目前台灣實務上常用的水理演算模式有GSTARS、NETSTARS、HEC-RAS、TABS2及SMS等演算模式，但這些模式尚未將河道邊坡穩定因子加入演算中，所以較不適用於會發生邊坡破壞的河道上。若在模式中附加上河道邊坡穩定分析因子，將更能適用於台灣地區。
本研究旨在水理演算模式NETSTARS，附加河道邊坡穩定模組，以進行水理演算，所附加的邊坡穩定模組包括平面破壞、泰勒圓弧破壞及普通切片法。本文並以草嶺崩塌區河道為例，經由模擬演算結果顯示，邊坡穩定因子對水理演算結果影響甚大。但河道水理影響因素甚多，需進一步研究，才能使結果更合乎實際。

Abstract

According to the field survey, it is obvious that the slope stability in landslide zones is a necessary factor for hydraulic computation. After riverbank failure, the changes of rivers are the width, depth, velocity, cross section, and so on. If the riverbank instability is considered in the hydraulic computation, there is remarkable influence for the change of the
riverbed and the river width.
In Taiwan, the hydraulic simulating models used in work include GTARS, NETSTARS, HEC-RAS, TABS2, or SMS. However, these modes are not considered yet for the factors of slope stability. They are not suitable for the river with
riverbank failure. In this thesis, the NETSTARS is implemented by slope stability analysis for river hydraulic computation. The slope stabile modules include Culmann plane failure , Ordinary Method of Slices, and Taylor method.
The river at the landslide area of the Tsao-Lin, Yuan-Lin is selected for a computational example. From the results of numerical simulations, the factor of riverbank instability strongly influences the change of the river width.
However, this thesis is a preliminary study related to the topics. There are still lots of factors needed for river hydraulic computation in future.