| Jiaxing area is characterized by the typical plain tidal river-networkwith high urbanization, big population and numerous rivers and lakes.Jiaxing area belongs to the subtropics monsoon climate with abundantrainfall. Long duration, high and intensity raining are the main factors thatcaused flood disaster. Frequent flooding and waterlogging disasters havebeen serious problems for a long time. All of these have brought a lot ofnew research subjects for the river-network area such as flood control,drainage. In most cases, river-networks can only be simulated numericallydue to its large scale.The principle of hydrological model and river-network hydrodynamic(HD) model was discussed in this thesis including the common softwareof these models and their applications. Various of models and programswere compared with each other and then MIKE11 was selected to setupthe river-network hydrodynamic model based on the features of Jiaxing area. And hydrologic model for Jiaxing plain area was setup using NAMmodel. Numerical simulation of river network flow in Jiaxing area waspresented in terms of NAM model and HD model. The results showed thatthe storm runoff simulation could provide reliable and accurate dischargefor the river-network HD model.Two hydrodynamic models according to two different densities ofriver network generalization were presented respectively. The comparativeanalysis, on the water levels and discharge changes to these two kinds ofhydrodynamic models, were carried out respectively. The result indicatedthat different densities of river network generalizations affect thecomputing results of the water levels and discharges. The thesis had alsoanalyzed influence of boundary condition on simulation of canal and othermajor rivers. Key hydrodynamic factors contributing to the simulation ofBeijing-Hangzhou canal were dealt with. For the hydrodynamic factors, thekey factors were water inflow at upstream and tidal water level atdownstream boundary.
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