Forecasting Longshore Sediment Transport on a Wave-Dominated Coast Using Various Wave Data Sources

Wave data is critical for calculating sediment transport, especially longshore sediment transport. However, wave measurement data is not always available in most areas of the Indonesian ocean, particularly on the Glagah-Congot Coast, Yogyakarta, Indonesia. Because of the breakwater construction, this coast is expected to experience unbalanced longshore sediment transport. Therefore, severe accretion and erosion occurred at certain locations on this coast. This study aims to look at how well ECMWF and ERDDAP wave data can be used to predict the transport of longshore sediment. Furthermore, the CERC equation is applied to calculate longshore sediment transport. These results compare to those of a previous computation utilizing Indian Ocean (JICA) wave data. The study’s findings show that all wave data sources show the same trend of longshore sediment transport even though the values differ. Because the significant wave height is mostly from the south, sediment transport on this coast is primarily to the west.