ADI method is adopted to establish a two-dimensional tidal current numerical model for Beilun Harbor based on the hydrologic data and sediment data. The current conditions of the site where the second stage project is...ADI method is adopted to establish a two-dimensional tidal current numerical model for Beilun Harbor based on the hydrologic data and sediment data. The current conditions of the site where the second stage project is going to be carried out are described. The analysis and calculations for the deposition and erosion in the harbor basin are performed, which provides references for the construction of the harbor. The effect of the pile group on the current is simulated by increasing the sea bed roughness which can be determined with empirical equations of artificial roughness. The method is considered to be applicable after verification with field data. The test has provided experiences for future mathematical modelling to simulate the open type hydraulic structures.展开更多
Based on the measured hydrological data from 1951 to 2008, the chain hydrological effect between Jingjiang River and Dongting Lake is analyzed by comparative method after the Three Gorges Project operation. The result...Based on the measured hydrological data from 1951 to 2008, the chain hydrological effect between Jingjiang River and Dongting Lake is analyzed by comparative method after the Three Gorges Project operation. The result indicates that 1） the scouring amount in Jing- jiang River made up 78.9% of the total from Yichang to Chenglingji, and its average scouring intensity was higher than the latter; 2） the water and sand diversion rates at the three outlets of the Jingjiang River were reduced by 2.33% and 2.78% separately; 3） the proportion of multi-year average runoff and sediment through the three outlets in the total into the Dongting Lake decreased by 7.7% and 24.4% respectively; 4） in Dongting Lake, the speed of sediment accumulation was lowered by 26.7%, in flood season, the runoff amount was 20.2% less than the multi-year average value, leading to seasonal scarcity of water year by year. The former prolonged the lake life, while the latter induced droughts in summer and fall in successive years, shortage of drinking and industrial water, shipping insecurity, as well as ecological problems such as decrease of birds and quick increase of Microtus fortis; 5） The multi-year average values of sediment and flood transporting capacity at the lake outlet were respec- tively increased by 26.6% and 3.7%, the adapt to the new change of the river-lake embankments were protected effectively. Then, to relation, some suggestions were put forward, such as optimizing further operation program of the Three Gorges Reservoir, reexamining the idea of river and lake regulation, and maintaining connection of the river and the lake.展开更多
文摘ADI method is adopted to establish a two-dimensional tidal current numerical model for Beilun Harbor based on the hydrologic data and sediment data. The current conditions of the site where the second stage project is going to be carried out are described. The analysis and calculations for the deposition and erosion in the harbor basin are performed, which provides references for the construction of the harbor. The effect of the pile group on the current is simulated by increasing the sea bed roughness which can be determined with empirical equations of artificial roughness. The method is considered to be applicable after verification with field data. The test has provided experiences for future mathematical modelling to simulate the open type hydraulic structures.
基金Construction Program of the Key Discipline in Hunan Province,No.2008001The Construction Program of the Key Discipline in Hunan Normal University
文摘Based on the measured hydrological data from 1951 to 2008, the chain hydrological effect between Jingjiang River and Dongting Lake is analyzed by comparative method after the Three Gorges Project operation. The result indicates that 1） the scouring amount in Jing- jiang River made up 78.9% of the total from Yichang to Chenglingji, and its average scouring intensity was higher than the latter; 2） the water and sand diversion rates at the three outlets of the Jingjiang River were reduced by 2.33% and 2.78% separately; 3） the proportion of multi-year average runoff and sediment through the three outlets in the total into the Dongting Lake decreased by 7.7% and 24.4% respectively; 4） in Dongting Lake, the speed of sediment accumulation was lowered by 26.7%, in flood season, the runoff amount was 20.2% less than the multi-year average value, leading to seasonal scarcity of water year by year. The former prolonged the lake life, while the latter induced droughts in summer and fall in successive years, shortage of drinking and industrial water, shipping insecurity, as well as ecological problems such as decrease of birds and quick increase of Microtus fortis; 5） The multi-year average values of sediment and flood transporting capacity at the lake outlet were respec- tively increased by 26.6% and 3.7%, the adapt to the new change of the river-lake embankments were protected effectively. Then, to relation, some suggestions were put forward, such as optimizing further operation program of the Three Gorges Reservoir, reexamining the idea of river and lake regulation, and maintaining connection of the river and the lake.
