Structural Connectivity of Sediment Affected by Check Dams in Loess Hilly-Gully Region, China

Check dams play an irreplaceable role in soil and water conservation the Chinese Loess Plateau region. However, there are few analyses on connection between check downstream channel impact structural connectivity sediment interception efficiency. Based a field survey, this study classified mode channel, actual control area percentage by discharge canal dam land was used to quantitatively evaluate degree of channel. The analysis results show that can be divided into eleven categories with different connectivity. modes its combination channels systems have large difference, system is less than or equal sum single watershed. will greatly reduced if main no lower reaches Compared dam, 0–42.38%, average 11.18%. According difference four typical small watersheds, optimization methods for series, parallel hybrid were proposed. research provide reference efficiency watershed also guide layout arrangement drainage facilities.