Effect Of The Zoobenthos Activities On The Seepage Features Of The Sediment Ground In The Yellow River Estuarine Area

Zoobenthic community is an important part of estuarine ecosystem, which comprises a broad assemblage of diverse forms, mostly Mollusca and Polychaeta, Crustacea. Sediment layer with biogenic features and zoobenthos activities of feed, build channels and burrows vary the grain size, structure of sediments, physical, mechanical and hydraulic properties, which causes the variation of wave loading effect, stress and seepage in sediments. Wave-induced seepage variation in the sediment is the main reason for the destruction of coastal or offshore engineering. Therefore, the study of bioturbation–induced seepage variation is very necessary. It is first time to research the effect of bioturbation on the features of sediment as viewed from seabed dynamic response in China. It is also in the beginning phase in the world. Large numbers of foundation research are requiredIn this dissertation, the research contents include following aspects: firstly, (1)Completely analyze these factors of the effect seepage features on seabed from a large region in the modern Yellow River Estuarine Area; (2) Analyze soil composition, physical properties, hydraulic conductivity, mineral composition and micro-structure of porous media from 1000 sampling in 20 meters soil column in each of four points in the coastal intertidal zone; (3) Investigate zoobenthic community and research Zoobenthic community in the coastal 10 intertidal zones, and analyze the relationship between organic matter contents and different intertidal zone. Secondly, a completed, further series of research on seepage features under bioturbation and wave is carried out in a typical research zone in the coastal intertidal zone which is an abandoned delta of Diaokou. Research works in the typical research zone include:①Apply high density resistance to measure solid resistance variation in bioturbation area and no bioturbation area, and trace the resistance variation with infiltration of saturated salt water, and discuss the seepage pattern of bioturbation sediment under different conditions.②Measure excess pore water pressure accumulation in a tide period, and apply effective...