Ci Manuk Flow Area is one of the river basins in Java Island. The Ci Manuk Delta changed from 1963 to 2002. Changes that occurred in the Ci Manuk delta were moved by extensive accretion. The reason for choosing Ci Manuk Delta is because the Ci Manuk flow has a high sedimentation rate compared to other flow areas, besides that, Sumedang Regency has built a dam to hold the sediment flow and repair floods. How this is done as a problem and research can be done to determine the delta-forming factors and changes in the delta region that occurred temporally from 2002 to 2018 after the dam was built. The method used in this research is spatial analysis and quantitative descriptive analysis. Spatial analysis is used to describe the spatial change in the temporary area and quantitative descriptive analysis is used to explain the results of the calculation of changes in delta area. The results of this study are the dynamics of delta changes that occur in the west are dominated by the addition of delta (accretion) with an area of 522.3 ha and undergo a change in shape from cuspate to birdfoot. The factors that support the addition of the area comes from internal factors, namely the high value of sediment and the low external factors originating from the marin.

慈马努克流域是爪哇岛的流域之一。从 1963 年到 2002 年，Ci Manuk 三角洲发生了变化。Ci Manuk 三角洲发生的变化受到广泛吸积的影响。之所以选择Ci Manuk Delta，是因为与其他流域相比，Ci Manuk 流域的沉降率较高，此外，Sumedang Regency 还修建了一座大坝来阻挡泥沙流和修复洪水。如何将其作为一个问题进行研究，以确定大坝建成后从 2002 年到 2018 年暂时发生的三角洲地区的三角洲形成因素和变化。本研究采用的方法是空间分析和定量描述分析。空间分析用于描述临时区域的空间变化，定量描述分析用于解释三角洲地区变化的计算结果。这项研究的结果是，西部发生的三角洲变化的动态主要是增加了面积为 522.3 公顷的三角洲（吸积），并经历了从尖峰到鸟足的形状变化。支持该区域增加的因素来自内部因素，即沉积物价值高，而来自海洋的外部因素低。