最近五十年来黄河三角洲潮间滩涂动力地貌演变研究

黄河三角洲属典型温带季风区淤泥质海岸，潮间滩涂独具特色，曾有过多次河口输沙减少及海岸类型的相应变化，近期流域—海岸带人类活动强烈。本项目把黄河三角洲潮滩作为整体，用地貌学、动力学和沉积学结合的技术路线，研究其最近50年来动力地貌演变。.内容包括最近50年来潮间滩涂的地貌、沉积特征、沉积动力体系及时空演变，以及三者内在联系、作用机理。拟解决的关键科学问题为：最近50年来黄河三角洲潮间滩涂沉积动力体系的组成结构、空间格局及演变。.目标是揭示最近50年来黄河口位置、边界条件、入海泥沙和相对海面变化对潮间滩涂沉积动力过程的影响，查明不同岸段潮滩的动力沉积联系，建立最近50年来潮间滩涂动力地貌演变模式。.项目已有较多研究基础。研究结果可深化全球变化影响下潮滩动力地貌演变研究，丰富关于全球海面上升和河流入海泥沙减少的海岸地貌效应的认识，为预测黄河三角洲地貌和环境演变提供依据。

The Yellow River Delta, the typical temperate monsoon and muddy coast with unique intertidal flats, has experienced the fluvial sediment decline from the Yellow River Estuary into the sea together with corresponding coast type changes several times during the last 2500 years, and undergone intense human activity from the river basin to coastal zone during the last 50 years. Morphodynamic evolution of the Yellow River Delta intertidal flats in the recent 50 years will be studied in this project, considering the intertidal tidal flats along different sub-deltas constituting the Yellow river delta as a whole, and applying a combination technics of geomorphology, dynamics and sedimentology. .Research contents of this project include intertidal flat geomorphic and sedimentary characteristics, sedimentary dynamic system and its spatio-temporal evolution along the Yellow River Delta in the last 50 years, as well as internal relations and mechanisms of action among them. The key scientific issue to be solved in this project is the composition structure, spatial pattern and evolution of the sedimentary dynamic system along the Yellow River Delta intertidal flats over the last 50 years. .Research object of this project is to reveal the influence mechanism on intertidal flat sediment dynamic processes which is affected by the migration of the Yellow River Estuary, changes of coastal boundary conditions, fluvial sediment from the Yellow river into the sea, and the relative sealevel over the last 50 years, to identify dynamic sedimentary relation between the different coast units, to establish the dynamic geomorphical evolution model of the Yellow River Delta intertidal flats over the last 50 years. .This project has much preliminary research work. Its findings can deepen the study on morphodynamic evolution of intertidal flats in the temperate monsoon region under the influence of global changes, enrich the awareness of the problem that the coast geomorphic effect impacted by global sea-level rise and sediment reduction of the river into the sea.