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Zhang Z.,Zhejiang Institute of Hydraulics and Estuary | Zhang Z.,Zhejiang Provincial Key Laboratory of Estuary and Coast | Zhang Z.,Zhejiang Institute of Marine Planning and Design | Yang Y.,Zhejiang Institute of Hydraulics and Estuary | And 2 more authors.
Electronic Journal of Geotechnical Engineering | Year: 2015

It is important to study the onset condition of scour below offshore pipelines for the protection of pipeline. In this paper a new and small scale numerical reversing tidal flow flume is established using FLOW-3D Software. This numerical flume can simulate the time process of tidal level as well as the flow velocity and shows good reliability. Using this numerical flume, the onset condition of scour below offshore pipelines under reversing tidal flow is discussed. The flow fields at different times in a period are analyzed and the influences of middle tidal level, flow velocity and buried depth on pressure difference are studied systematically. The onset condition of scour below offshore pipeline for reversing tidal flow is determined, which supplies the technical support for practical engineering. © 2015 ejge.


Pan C.,Zhejiang Institute of Hydraulics and Estuary | Pan C.,Zhejiang Institute of Marine Planning and Design | Zhang S.,Zhejiang Institute of Hydraulics and Estuary | Zhang S.,Zhejiang Institute of Marine Planning and Design | And 2 more authors.
Shuikexue Jinzhan/Advances in Water Science | Year: 2015

Based on the long term hydrological and bathymetric analysis, the morphological evolution in the estuary features the significantly large riverbed change, that is, the great erosion in runoff-dominated periods and the great sedimentation in tide-dominated period in the upper reach of the Qiangtang River estuary. This morphdynamic characteristics results in the large variation of tide in the upstream section and therefore affects saltwater intrusion. With plentiful runoff during wet seasons, the riverbed suffers great erosion, leading to the increase of river convey volume and enhancement of tide. This results in the increase of saltwater intrusion in falls with strong tide. On the contrary, with small runoff during wet seasons, the river convey volume is small. Therefore, it results in weakening saltwater intrusion in falls. The results indicated that the runoff variation has direct and indirect impacts on saltwater intrusion in the Qiantang River estuary. The direct impacts are the common characteristics of tidal estuary, i. e. saltwater intrusion increases as runoff decreases. The indirect impact is that the large erosion caused by the large runoff results in the increase of tide, and therefore indirectly leading to intensified saltwater intrusion. This feature results from the characteristics of the large riverbed change and its great response of tide strength in the Qiantang River estuary. ©, 2015, China Water Power Press. All right reserved.


You A.J.,Zhejiang Institute of Hydraulics and Estuary | You A.J.,Zhejiang Institute of Marine Planning and Design | Jin Q.N.,Zhejiang Institute of Hydraulics and Estuary | Jin Q.N.,Zhejiang Institute of Marine Planning and Design | And 2 more authors.
Resources, Environment and Engineering - Proceedings of the 2014 Technical Congress on Resources, Environment and Engineering, CREE 2014 | Year: 2015

The water quality of man-made lake is affected by both the quantity and quality of the source water. Therefore, the design strategy of water circulation system based on source water quality was investigated in order to ensure the water quality of the planned man-made lake. Taking the planning man-made lake in Shangyu as an example, this paper analyzed the water quality and the pre-treatment scheme of the planned source water. According to the observed data, water quality of the source water couldn't meet the planned water quality goal of the manmade lake, therefore, the idea of integrated internel, external and self water circulation system was proposed.


Pan C.,Zhejiang Institute of Hydraulics and Estuary | Pan C.,Zhejiang Institute of Marine Planning and Design | Zhang S.,Zhejiang Institute of Hydraulics and Estuary | Zhang S.,Zhejiang Institute of Marine Planning and Design | And 4 more authors.
Advances in Science and Technology of Water Resources | Year: 2015

Using a finite volume method based on the Godunov scheme, a two-dimensional saltwater intrusion mathematical model considering the tidal bore effect was established for forecasting chlorinity at water intakes in the Qiantang River Estuary. Based on field data and computational results from the mathematical model, the effects of main factors, including runoff, tides and tidal bore, and riverbed topography, on saltwater intrusion were analyzed. Results show that the riverbed topography affects saltwater intrusion indirectly through changing tides. The larger the river volume is, the larger the tidal range and tidal prism are, leading to intensification of saltwater intrusion. The tidal bore also enhances saltwater intrusion, as chlorinity changes abruptly before and after the tidal bore. Application of the established model in chlorinity prediction shows that the computational results of the model agree with the field data, and the model has significant application value in chlorinity prediction. ©, 2015, Editorial Office of Journal of Hohai University (Nature Sciences). All right reserved.


Pan C.-H.,Zhejiang Institute of Hydraulics and Estuary | Pan C.-H.,Zhejiang Institute of Marine Planning and Design | Zhang S.-Y.,Zhejiang Institute of Hydraulics and Estuary | Zhang S.-Y.,Zhejiang Institute of Marine Planning and Design | And 6 more authors.
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2014

With strong tide, rapid flow and turbulent tidal bore, Qiantang Estuary is a typical well-mixed one. Its saltwater intrusion is far stronger than other tidal estuaries. Based on a finite volume method with Godunov scheme, a 2D saltwater intrusion mathematical model affected by tidal bore was established. Combining with the field data analysis for tide, tidal bore and chlorinity, the effect of the tidal bore on saltwater intrusion of Qiantang Estuary was studied. The tidal bore increases the aggravation of saltwater intrusion, resulting in intensification of the gradient in time domain and in lengthways. The tidal bore is the kinetic mechanism to form salinity front. Meanwhile, the fierce and turbulent tidal bore makes chlorinity even in vertical distribution. In addition, the value of chloride diffusion coefficient in the chlorinity control equation has been discussed, and it is appropriate to take the diffusion coefficient in Qiantang Estuary for 102 m2/s magnitude. ©, 2014, China Water Power Press. All right reserved.

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