黄河下游滩涂湿地泥沙冲淤格局及影响因素OA

[Objective]This study aims to elucidate the sediment erosion-deposition patterns in typical floodplain wetlands of the lower Yellow River under the influence of water-sediment regulation by the Xiaolangdi Reservoir and to explore the feasibility of predicting these patterns using remote sensing-derived influencing factors,thereby providing scientific support for ecological protection and high-quality development of the wetlands in this region.[Methods]This study selected six representative floodplain wetlands in the lower Yellow River,where sediment erosion-deposition processes were monitored from 2023 to 2024 using RTK(Real-Time Kinematic)surveys along established transects and sampling points.By integrating hydrological data and multi-source remote sensing imagery,the effects of four key factors-relative elevation,distance from the river channel,NDVI(Normalized Difference Vegetation Index),and inundation duration-on sediment erosion-deposition patterns were analyzed.[Results](1)Microtopographic changes exhibited significant spatial heterogeneity across the wetlands,though deposition dominated as the overall trend(mean deposition thickness was 0.152 m).(2)The correlation coefficients between relative elevation,distance from the river channel,NDVI,and inundation duration and the amount of erosion-deposition at the sampling points were-0.319,0.046,-0.129 and 0.174,respectively,with all p-values less than 0.05.(3)The multiple regression model established using all factors had an R2 of 0.116 and p<0.001.[Conclusion]The floodplain wetlands in the lower Yellow River are dominated by sediment deposition.While a statistically significant correlation exists between net sediment change and various influencing factors,the linear relationship is relatively weak.Furthermore,multiple regression analysis indicates that accurately predicting sediment erosion-deposition patterns using the existing factors remains challenging,highlighting the complexity of the geomorphic processes in this region.