本研究探討顆粒及水流條件對沖積扇坡度及堆積型態之影響，實驗使用的顆粒為中砂和粗砂，在不同砂量、不同濃度的水砂比進行實驗，藉此觀察沖積扇的平面堆積形態變化與時間歷程以及掃描最終縱剖面。實驗顆粒由桶倉儲存槽經由渠道沖積於平台上，觀察乾砂顆粒在平台上之沖積輪廓、時間歷程以及利用2D-LiDAR掃描最終縱剖面之結果，並討論坡度之關係。改變不同的水砂比，對於濕砂之沖積或堆積造成什麼影響，討論濕砂之沖積輪廓、時間歷程以及掃描最終縱剖面之結果，從扇面之歷程可知，前期發展縱方向大於側方向；而剖面分析中，水砂比小時，曲線呈現下凹形，水砂比大時，曲線呈現上凸形。探討不同水砂比與最大沖積距離之影響，從結果可知水砂比增加會使最大沖積距離加大及坡度變緩。在水砂比大之情況下，扇面影像分析所觀察到的脫離改道和渠道化現象。;The effects of particle and water flow conditions on the surface slope and deposition patterns of alluvial fans are experimentally explored in this study. The particles used in this study include both medium sand and coarse sand, under the condition of varying discharges of water and sediment. The fan shapes at different time steps were measured by a 2D-LiDAR and compared with pictures taken from cameras. The longitudinal progradation at the earlier stage is faster than that in the lateral direction. Regarding the longitudinal profile, the curve will be concave or convex for the water-sediment ratios are small or large, respectively. The increase of water-sediment ratios will enhance the maximum alluvial distance and reduce the corresponding surface slope. In the case of a large water-sediment ratios, the phenomena of avulsion and channelization on the fan surface were observed.
