河道之河床沖刷、淤積受水理特性、河道地形、河床質等自然因素之影響。本研究以曾文溪行水區內施設護岸工、丁壩工、固床工及施作堤防等工法治理前後，進行河床變化分析與探討。
由於本區段河道蜿蜒，上游屬砂礫質河床，中游屬砂泥岩區，曾文溪整治以人口密集，危害人民生命財產區域為優先，因凹岸處（攻擊坡、基蝕坡）施設構造物後，易造成凸岸處（滑走坡）河床沖刷、河道地形變化。
本研究採用沖刷磚埋設檢測河床沖淤狀況，並配合大斷面樁橫斷面檢測，了解本區段河道變化情形；經檢核沖刷磚沖淤情形與河床斷面變化情形，大致符合，施設固床工上游處呈現淤積，下游處因跌水現象發生，而形成侵蝕；另施設丁壩工時除挑流至河心功能外，上游壩頭沖蝕，下游斷面產生淤積，均能達到原先預期之防治功效，而當填築堤防或護岸時，凹岸處基址之掏刷現象也明顯獲得改善。
本研究以構造物施設後之侵淤變化及防治成效，評估結果顯示，設施人為結構物，確實為解決堤岸沖刷之優選方式。

Riverbed erosion and deposit are affected by natural factors such as hydrological characteristics, river channel topology and riverbed material. This research investigates and analyzes riverbed variation in Tsengwen river reservation before and after river regulation installations such as riverbank protection, spur dikes, groundsill works and riverwall are constructed.
Since the river section of interest has meandering river channel, the upstream riverbed is gravel and the midstream riverbed is sand shale. The river sections which have the riverbed characteristics above and run through high population density areas are dangerous to life and property of local people. Hence, the river management authority puts priority of Tsengwen river regulation in the river section of this research. The installment on convex bank such as attack slope or undercut slope frequently causes erosion on concave bank (slipoff slope) riverbed and changes in riverbed condition.
This research checks riverbed erosion and deposit with buried washed brick. Cross section examination with large cross section stakes also contributes to the understanding of river channel variation. The examination of this research shows that the washed brick erosion and deposit approximates the variation in riverbed cross section. The upstream of groundsill work shows the sign of deposit; the occurrence of water fall in the downstream section causes erosion. In addition to flow deflection to midriver, dike head erosion upstream and section deposit downstream of spur dikes show that spur dikes achieve anticipated protection results. The placement of river wall and bank protection evidently moderates the scouring in convex bank base sites.
This research investigates the erosion and deposit variations and protection effectiveness after water regulation installments are constructed. From the investigation results, artificial water regulation installments are the best way to solve riverbank erosion.

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