河川中泥砂顆粒的大小是影響河川動態行為的重要因子。泥砂顆粒決定了河道的邊界型態，同時也會影響河道中水流的流況，因此若能有效描述河床質粒徑之分佈情形，則有助於河床變動之監測與河道管理，以及水域生態棲地之相關保育和監測方面等議題之研究。本研究以台灣高屏溪流域為研究區域，蒐集並取樣該區域上游(旗山溪、荖濃溪和隘寮溪)以及下游河段之河床質粒徑資料，共43個樣坑均以標準明坑試驗的方式完成。本研究首先探討不同代表粒徑(如，D50和D90)以及曼寧n值在空間上的分佈情形，然後參考粒徑分佈公式Grain Size Distribution (GSD)，探討泥砂顆粒累積停留機率與其顆粒大小之間的關係，找出上下游河段的特徵粒徑參數DC，接著以不同的代表粒徑修改GSD公式中的特徵粒徑參數，使粒徑分佈公式更能反映泥砂顆粒的運動行為。結果顯示在高屏溪流域，不同的代表粒徑中以D65最能描述上下游泥砂顆粒累積停留機率與其粒徑大小間的關係。本研究成果可以提供河川以及集水區在治理規劃時的參考。

The grain size of sediment materials on riverbeds is an important factor of river morphodynamics. In general, sediment materials determine the transport capacity of river flow, leading to the different types of natural river channel networks. Hence, characterizing the grain size distribution is able to refine stream monitoring for the issues of habitat evolution and river management. In this study, we collected 43 standard volumetric samplings in the Kaoping River basin by sampling to clarify its corresponding grain size distribution of bed materials. Here we discuss the spatial distribution of different representative grain size (e.g., D50 and D90) and Manning's n value in each sampling. Then, an exponential grain size distribution (GSD) formula is used to explore relationship between the frequency and size of riverbed sediment materials, and to find the characteristic diameter DC in GSD formula. Furthermore, we used different representative grain size of sediment materials instead of DC leading the formula to relate with sediment transport capacity. Results show that D65 could be a suitable parameter to describe the exponential relationship of sediment frequency with respect to its corresponding size. This study could provide some useful information for the management of rivers and watersheds.

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