Wang S.,Hydrological Bureau of Zhejiang Province |
Zhou S.,University of Sichuan |
Wang X.,University of Sichuan
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2014
The wide gradual reach is a common form of natural rivers because of the impacts of flow and sediment conditions, and man-made projects. Based on the flood process and erosion and deposition of hydrological observational cross section in a gradual width river, the hydrodynamic characteristics was simulated and analyzed by means of a two-dimensional flow model. The comparison between observation and simulation showed that the intensities of increase and decrease of flood depend on the value and duration of flood process, and the velocity distribution at any cross section often change with the variation of asymmetry river wide, which affects the bed deformation in the whole reach considering the effect of sediment critical incipient velocity.
Wang S.-Y.,Hydrological Bureau of Zhejiang Province |
Zhou S.-F.,University of Sichuan |
Zhao X.-E.,The Pearl River Hydrology and Water Resources Survey Center |
Liu X.-N.,University of Sichuan |
Wang X.-K.,University of Sichuan
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2013
The wide gradual channel is a common form of natural rivers. The flow structure was measured in the physical model with wide gradual channel by means of acoustic Doppler velocimeter. The results showed that the flow presents different evolutions between the local diverging sections and converging sections. The scales of the streamwise velocity and the secondary flow of the upper layer decrease in diverging sections, however, the later shows the inverse variations in converging sections. In addition, the flow separation occurs in the whole lotus root shape channel. These flow characteristics often affect the sediment movement and channel processes.
Wu Y.,Hydrological Bureau of Zhejiang Province |
Tao Y.,Hydrological Bureau of Zhejiang Province |
Liu F.,Hydrological Bureau of Zhejiang Province
Advances in Science and Technology of Water Resources | Year: 2015
Taking the annual maximum flood peak flow, rainfall intensity, drainage area, river length, and river slope at different periods of 122 hydrological stations in Zhejiang Province as indicators, the regional regression equation is established. Then, the regression equation is used to calculate the annual maximum flood peak flow at those hydrological stations. Comparing the calculated values with observations, the results show that the relation between them significantly follows the regionalization rules. Therefore, Zhejiang Province can be divided into two flood calculation zones. Points where the calculated value is bigger than the measured focus on the areas such as the middle and upper reaches of the Qiantang River, the middle and upper reaches of the Ou River, the Puyang River, and the Cao'e River, and the points account for 69.5% of whole points in the zone; points where the calculated value is smaller than the measured focus on the areas such as the Tianmu Mountain, Kuaiji Mountain, Siming Mountain, Tiantai Mountain, Dapan Mountain, Kuocang Mountain, and the North and South Yandang Mountain, distributing as “7” glyph, and the points account for 73% of whole points in the zone. The result matches the zonings of plum rains (East Asian rainy season), typhoon rain, land utilization, vegetation, etc., in Zhejiang Province, which reveals that the zoning result is reasonable and the zoning method is feasible. ©, 2015, Editorial Office of Journal of Hohai University (Nature Sciences). All right reserved.