本研究著重於改變單一坡度，以A系列及B系列區分入流密度的差異與順序，探討一維三角洲在單一坡度上交替入流是否維持其自我相似性。透過利用中尺度新的一維三角洲實驗水槽，可以觀測並分析的組數較以往來得更多，對長時間交替三角洲是否維持其自我相似性(self-similarity)有更深入的研究與分析。
實驗成果顯示，單一不同坡度的三角洲在形貌的發展上，若入砂以及入流的條件保持恆定不變，形貌上的發展也會呈高度的自我相似性。在實驗進行的過程中，在發生清水流(homopycnal flow)交替至異重流(hyperpycnal flow)的情況，清水流三角洲(Gilbert delta)的形貌會在入流密度交替的剛開始被異重流所破壞，在一定時間的調整期(adjustment period)後，三角洲的形貌會改變為異重流三角洲(hyperpycnal delta)，並在入流及入砂條件穩定的情況下呈自我相似性發展，相反地，在異重流交替至清水流的情況，清水流三角洲會直接以原本異重流三角洲為底床開始發展，並且呈現自我相似性。
在實驗分析的部份，我們利用Lai and Carpart (2007, 2009)所發展至今的一系列Matlab程式進行分析，透過利用縮時攝影(time-lapse photograph)以每五秒拍攝一張照片觀察三角洲形貌的發展歷程，並透過數位影像處理取得三角洲的底床高程以及兩個移動邊界隨時間的移動軌跡，再利用無因次化(normalized)來判斷三角洲之自我相似性。實驗取得的結果證實了在三種不同的單一坡度中，若入流以及入砂的條件不變，三角洲形貌的發展會呈高度的自我相似性。本研究進行了A系列以及B系列兩種不同的交替順序互相驗證，且增加了實驗模型之尺度亦能將實驗時間拉長，使三角洲之自我相似性在單一坡度上的分析更加準確，並補足了先前研究所缺少的部份，未來能與現地所取得的資料結合，在實務上也能協助進行水庫清淤、海岸線變化及三角洲體積之預測等部份。

In the field cases, the inflow situation will be complex and changeable. If a river with high sediment concentration flows in to sea gate, hyperpycnal delta will be formed in this situation, but the environment might changes with time, the river started to carry low sediment concentration that close to receiving water basin and formed Gilbert delta. In this study, we focus on using alternatively density of inflow to simulate the inflow changes in field cases and observe the deltas profiles in alternating inflow. At the same time, we also track the two moving boundaries of the delta to confirm the self-similarity of the delta. We use salt water and clean water to simulate hyperpycnal flow and homopycnal flow respectively. These two kinds of inflows are provided alternatively under constant time period in the experiment. There are three different bedrock slopes are selected to use in experiment runs. To make up for the missing parts of the previous research, we build a lager experiment flume for extend the experiment time. We have set A series (Gilbert delta first and then hyperpycnal delta) and B series (hyperpycnal delta first and then Gilbert delta) to represent different inflow alternating sequence. The experiment results show that delta has strong self-similarity exist in the alternatively density of inflow situation.

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