Analysis And Research On Silting In Harbor Basin--Taking Fuzhou Mawei Harbor As An Example

The operations of harbors and docks are seriously hindered by sedimentation, which discourage the development of harbor transportation and regional economy. It's an urgent and necessary problem of analyzing and solving sedimentation of harbor basins. The analysis and research on sedimentation of Mawei harbor in Fuzhou was carried out in this paper as an example. Flow conditions of the harbor basin were studied by using numerical model. The solution can be used in engineering studies and designs.This paper was set out from the analysis on depth changes and evolvement of washing out and filling out in Mawei of Fuzhou harbor, the evolvement characters of harbor basin were summed up. There is no relationship between the flow and sediment rate from upper reach and sedimentation, which was closely linked with flow changes and caused directly by tramquill flow under the secure of Dama reef.Several numerical calculation methods were introduced and compared based on the summarization of former achievements, numerical model was establish by using visual program FASTTABS based on the calculation model of two-dimensional shallow water. Experimental calculation solutions show that ebb tide is more salient and harbor basin is on concave bank when tide is falling, which cause straightforward velocity in harbor basin and benefit to sediment transportation and the maintenance of water depth. In this paper, reasons of sedimentation and current movement status in Mawei docks often thousands tons were studied, furthermore, a good many questions brought forward from engineering practice are satisfactorily answered. It was mentioned that only by enhancing hydrodynamic conditions can good effects be achieved in waterway regulations.