Parallelization Of Numerical Storm Surge Forecasting Around Hangzhou Bay And The Coastal Areas Of Zheiiang

Storm surge is an integrated disaster with a collection of marine,meteorology, flood and so on. Each year there’re several typhoon in China, causinghuge losses of the lives and property to the coastal areas’ people. And Hangzhou Bayis one of the most serious areas in China. So it is strongly practical meaningful forthe study of storm surge along the Hangzhou Bay and Zhejiang coastal area.In this paper, the characteristics, disaster and harm of storm surge is analyzed.The great influence of storm surge in Hangzhou Bay is described. The researchprogress and status of the numerical prediction of storm surge is summarized.The earlier numerical prediction method of SPLASH mode nomogram method isstudied. A more precise calculation of a two-variable interpolation method combinedboth three points and full range is used. Moreover, a correction method about theSPLASH mode nomogram is given to provide some reference for the2D numericalprediction. The No.6903typhoon Viola and the typhoon Camille which occurredacross the Mississippi in1969are selected as examples to verify the calculation. Theresults show that the method in the article is feasible.In the static condition, the storm surge numerical model is studied. A finitedifference method with the scheme of semi-explicit and semi-implicit is used todiscretely solve the control equations. The pressure field distribution of the domain isgot by the calculation that nested the two formula of Fujita and Fujita-Takahashipressure formula. The wind field distribution of the domain is got by the gradientwind formula and the Ueno shift wind formula.The computational domain is divided into a smaller grid according to the actualterrain of Hangzhou Bay to make the boundary fitting better. The NO.5612typhoonWanda and the NO.7708typhoon Babe are selected as examples to the calculationrespectively on the big and small grid. And the measured data of several typical tidestations is used to verify the results. It turns out that the results from the small grid fit better.The C++programming language is selected to develop a2D parallel numericalprediction visualization software on Visual Studio2010platform. The numericalcalculation is carried out by inputing the water depth data, the underwatertopography and the typhoon parameter data every6hours. And the input parametersare gained from the meteorological website, including the latitude and longitudelocation of typhoon center, the radius of maximum wind, pressure reading in centerof the typhoon. The typhoon moving track and the surge process across the wholecomputational domain are displayed in the interface of the program intuitively.Moreover, both the storm surge curve of selected tidal station and the wind velocitycurve of the typhoon are displayed synchronously.