天然沖積河流深槽多屬蜿蜒形態，因而洪水高漲時，在兩岸堤防之間形成蜿蜒複式河槽。本研究以水工模型試驗及二維水深平均模式分析深槽蜿蜒之複式斷面直渠水理特性。由量測結果之分析可看出因彎道離心力的影響，主深槽橫向水面之超高現象影響兩側洪水平原之水位。橫向底床水平的蜿蜒深槽，最大流速係在彎道處接近凸岸，在過度段(直線)則約在中間；由深槽中心的流速量測值可看出有明顯的二次流現象，底床附近二次流由凸岸向凹岸，水面附近則為凹岸向凸岸。深槽蜿蜒複式渠道之水深上漲至洪水平原時，主深槽之流量會因斷面取法而不同。

Most of the main channels of alluvial rivers are meander. The main channels are forming compound river channel between the embankments during rise of flood. The purpose of the study is to analyze hydraulic characteristics of the meandering compound cross-section channels by experiment in laboratory and alluvial two- dimensional depth average model. The experimental results indicated that the centrifugal force in curved channel cause superelevation of cross current in the main channel affects the stage of floodplains. The maximum velocity occurred near the convex bank of the curved channel in the meander main channel, occurred in middle of the transition reach. The obvious phenomenon of secondary flow has been shown by the measured value of velocity in middle of the main channel. The secondary flow near the river bed was from convex bank to concave bank. However, the secondary flow near the water surface was from concave bank to convex bank. The discharge in the main channel of compound cross-section was different due to cross-section determination during the water depth rise to floodplain.

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