Citarum River, the longest river in West Java, is one of the most strategic rivers yet one of the most polluted rivers causing a series of floods throughout history. Understanding shallow flood deposits characteristics may infer the past flooding episode and predict future flood deposits distribution. This research aims to analyze grain size and elemental distributions of flood deposits found in the Citarum Riverbank Area at several districts in Bandung Regency, West Java. Shallow coring resulted in soil samples showing that the samples were dominated by clay and silt. Element analysis revealed that Si and Al are the major elements followed by high concentrations of Fe-oxide in all soil samples. Based on these findings, it is presumed that there were two major episodes of past-floods that occurred in the research area.

The Tidal wave is one of the main factors that producing sedimentary structure and agent of erosion. Study further about it can help for local people living in the coastal area and for academic learning. The tidal wave was replicated using a flume tank. The sand used is fine-grained that taken from Sawarna beach. To obtain the quantitative Digital Elevation Model (DEM) was used. The DEM data were taken using a laser distance meter after the experiment. Reynold’s Rule was used for scaling down the variable that happens in nature to the experiment scale. There are 3 significant changes as a result of this experiment. First, the sediment was sorted according to the grain size of the sediment. Second, the slope of the coast has changed which is measured by DEM. Third, the sediment structure was created which has a similarity with the one created by nature. So, the result was a proof that Reynold’s scaling down methods can be used to scale down a sedimentary process that happens in nature. This research explains what exactly happens in the formation of a sedimentary structure.