Study on the discharge re-distributions of multi-circle, capillary-like river networks by a 2D numerical model
mbalanced developments of the Jing-nan river networks lead to flood-control, water-supply and environmental problems in nearby water system. In this background, regulations are tried to restore healthy Jing-nan river networks. In this study, we attempt to use a semi-implicit 2D numerical model to simulate flows in large-scale, complex river networks and study the regulation designs. The domain of the river networks (611.5km2) is covered by a channel-refined, unstructured grid of about 104,000 cells, and the flow system is solved as a whole. The newly developed PCP method by Hu(2012) is adopted to parallelize the solution of linear equations derived from the velocity–pressure coupling problem. In calibrations and validations, the computation errors are generally less than 0.35% and 6cm respectively for the discharge and water level. The accuracy is obviously improved in a 2D simulation relative to that in a traditional 1D simulation, to a degree of an order. More over, a max speedup of 42.3 is achieved for runtimes using 32 sub-domains and 32 working cores. The simulation of one-year unsteady hydrodynamics process is estimated to be finished in about 3.3 hours. Then, effects of regulation constructions (over-topping dams) are studied and compared, to clarify their effects on the discharge re-distributions of nearby river networks. The recommended regulation design performs an annual-averaged reduction of the diversion flow of the Suzhi River. After the regulation, the Song-west River is expected to be eroded in an annual-averaged term, and the current imbalance of river networks will be gradually eliminated.
river networks 2D numerical model river regulation parallel computation Three Gorges Project (TGP)
Dechao Hu
Yangtze River Scientific Research Institute, Huang-pu Street 23＃, Wuhan 430010, China
国际会议
The 3rd Biennial ISRS Symposium Achieving Healthy and Viable Rivers (ISRS)第3届国际河流大会
北京
英文
297-310
2013-08-05（万方平台首次上网日期，不代表论文的发表时间）