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| 1 | SUSPENDED SEDIMENT TRANSPORT IN THE OFFSHORE NEAR YANGTZE ESTUARY显示文摘Based on the Estuarine,Coastal and Ocean Modeling System with Sediments(ECOMSED) model,a 3-D hydrodynamic-transport numerical model was established for the offshore area near the Yangtze Estuary in the East China Sea.The hydrodynamic module was driven by tide and wind.Sediment module included sediment resuspension,transport and deposition of cohesive and non-cohesive sediment.The settling of cohesive sediment in the water column was modeled as a function of aggregation(flocculation) and deposition.The numerical results were compared with observation data for August,2006.It shows that the sediment concentration reduces gradually from the seashore to the offshore area.Numerical results of concentration time series in the observation stations show two peaks and two valleys,according with the observation data.It is mainly affected by tidal current.The suspended sediment concentration is related to the tidal current during a tidal cycle,and the maximum concentration appears 1h-4h after the current maximum velocity has reached. | CHEN Bin WANG Kai | 2008 | Journal of Hydrodynamics2008，20，3： | 14 |
| 2 | EXPERIMENT OF IMPACT OF RIVER HYDRAULIC CHARACTERISTICS ON NUTRIENTS PURIFICATION COEFFICIENT显示文摘Hydraulic characteristics of a river are the key factors for river water quality improvement and river restoration. A simulated river was exploited to study the interactions between water contaminant purification coefficients and the characteristics of the river, such as the cross-section velocity, water depth, Reynolds number, and Froude number. To enhance the purification capacity of the river, detritus with 5 mm to 10 mm in diameter and contact surface area per volume of 87.6 m2/m3 were constructed naturally at the bed and along one side of the bank to form half shape of the river cross-section. During the one-month experiment (including 3 periods) from the third of November to the fourth of December, 2005, three categories of hydraulic conditions were investigated. Results show that the purification coefficient (K) of Total Nitrogen (TN) is closely coherent with the hydraulic retention time (T), river length (L), Reynolds number (Re) and Froude number (Fr). The relationship of K and T generally agrees with the power law under the three experimental water hydraulic conditions. Based on these results, the optimal Re and Fr ranges can be obtain to serve as a guideline for ecological re-engineering design to improve river water quality and restore river ecosystem. | WANG Pei-fang WANG Xiao-rong WANG Chao | 2007 | Journal of Hydrodynamics2007，19，3： | 6 |
| 3 | NUMERICAL SIMULATION OF WIND-INDUCED MOTION IN SUSPENDED SEDIMENT TRANSPORT显示文摘In regions with broad water surfaces such as lakes, reservoirs and coastal areas, the wind stress on the flow motion generates a significant impact. The wind stress is an unsteady force which makes numerical simulation difficult. This paper presents a two-dimensional (2-D) mathematical model of the impact of wind-induced motion on suspended sediment transport at Beijing's 13-Ling Reservoir. The model uses the Diagonal Cartesian Method (DCM) with a wetting-drying dynamic boundary to trace variations in the water level. The calculation results have been tested against in situ measurements. The measurements confirm the model's accuracy and agreement with the actual situation at the reservoir. The calculations also indicate that wind stress holds the key to suspended sediment transport at Beijing's 13-Ling Reservoir, especially when westerly winds prevail. | CHEN Zhi-he FANG Hong-wei LIU Bin | 2007 | Journal of Hydrodynamics2007，19，6： | 3 |
| 4 | EXPERIMENTAL STUDY ON INSTANTANEOUS DISCHARGE OF UNSORTED PARTICLE CLOUD IN CROSS-FLOW显示文摘A series of extensive laboratory experiments were conducted to investigate the transport and mixing of instantaneous discharge of unsorted particle cloud in cross-flow. The following experimental results were obtained: (1) the vertical frontal position and the longitudinal width of the particle cloud in the cross-flow is much larger than those in stagnant water, (2) the smaller cross-flow velocity will normally cause the larger non-dimensional frontal position for the same particle size range and initial volume, (3) the non-dimensional longitudinal width of the particle cloud in the cross-flow increases with the increase of cross-flow velocity. The empirical constants (α1, α3 and α2) and their variance range, which can be used to determine the relationships of non-dimensional vertical frontal position and time, longitudinal width and time, and vertical frontal position and longitudinal width were also obtained through the analysis of experimental data. | GU Jie HUANG Jing LIC. W. | 2008 | Journal of Hydrodynamics2008，20，1： | 2 |
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