The fractal characteristics change in the Huanghe River Estuary due to the hydrodynamic conditions variety

The research area lies in the subaqueous delta that the Huanghe River entering the sea is formed vis Diaokou between 1964 and 1976.One well field road was built for exploring petroleum which formed a seawall favorably obstructing waves.The hydrodynamic conditions of the north side of the road are relatively violent,on the contrary,that of the south side of the road is nearly placid,which makes the research area a natural laboratory fog studying the influence of the hydrodynamic conditions on the fractal characteristics of the tidal flat.Selecting a area named Case 1 on the side of strong hydrodynamic conditions,and a area named Case 2 on the other side.Measuring the topography and sampling,and analyzing the granulometric compositions,it is found that the hydrodynamic conditions have fatal influence on the surface fractal dimensions and the granulometric fractal dimensions of the research area.In Case 1,which has the strong hydrodynamic conditions,the surface fractal dimensions are obviously larger than those of Case 2 and the granulometric fractal dimensions are relatively smaller than those of Case 2,the surface fractal dimensions of Case 1 decrease quickly with the increase of grid size; the granulometric fractal dimensions are disperse,while the conditions of Case 2 are just reverse.A sampling line and a sampling point in depth on each side of the road are selected.It is found that in the south side of the road the granulometric fractal dimensions change regularly in the line and in depth,the more far from the road the smaller the fractal dimensions,and the more deep the sampling position is the larger the fractal dimensions.While the north side of the road has no this orderliness.The mechanism of the influence of hydrodynamic conditions on the fractal charateristics is discussed.