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Study on the Fluvial, Hydrodynamic and Water Quality Processes in Downstream of Xiangjiang River

Author: LiChangLing
Tutor: JiangChangBo
School: Changsha University of Science and Technology
Course: Port, Coastal and Offshore Engineering
Keywords: Fluvial Hydrodynamic simulation Numerical simulation of water quality
CLC: TV147.5
Type: Master's thesis
Year: 2011
Downloads: 48
Quote: 0
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Abstract


This paper studies the Xiangjiang River downstream hydrological terrain data in recent years, has been lower reaches of the Xiangjiang river bed evolution. Through the establishment of a one-dimensional hydrodynamic and water quality model to study long river flow within the hydrodynamic characteristics, as well as the variation of pollutants. On this basis, focusing on river sand mining in the river changes, and make the following aspects of the research and analysis. (A) upstream hydro regulatory role within reach of small water lasted cause prolonged washout period increased river sediment reduction, will inevitably lead to the sustainable development of river erosion; river reach more performance for Chau Tau Jiangxinzhou scour Chau Mei siltation, sedimentation downstream extension; Jiangxinzhou extending upstream deposition generally by the upstream embankment construction near the riverbank and affected by the presence or river bend to sit by the river bends role written; role by revetment construction riverbank erosion in the river bed down in the process, with contour distribution gradually move closer to the next cut shoreline revetment construction is bound to endanger the safety of building revetment stability; being within reach of human factors sand, river flow conditions deteriorate, that river Within the main fluvial; river water level increases with flow changes. (2) with sub-type parameter assignment methods, models Roughness set in the time between 0.027-0.033 calculated results coincide with the actual value of the highest degree. Although the roughness value in this range, the calculation error is still present, and the distribution of error is a pattern: small calculation error when the high water level, the low water level calculation errors. According to the actual situation of the Xiangjiang River, between roughness values ??are reasonable in the 0.027-0.033. The main sources of error are scattered downstream river thalweg, dry season water dispersion; riverbed changes irregularly, resulting in reduced accuracy of the information model of the terrain, which makes the final calculated results with the measured results have greater access. (3) development of dozens of different flow and water level, calculated using the model under different conditions of the river water surface, the model for the next lay the foundation for water quality analysis of calculation results. (4) water quality model results are consistent with trends in pollutants, but because in the model only considers the impact of upstream sewage, no sewage situation along the river and take advantage of quantization, so water quality modeling results do not fully reflect river water within the actual changes. The numerical results and the actual monitoring results Another factor is due to the deviation of the selected text between the four pollutants present transformation, this relationship is difficult to quantify. (5) the use of dozens of different hydrodynamic flow of different water levels, analyzes the pollutants subject to hydrodynamic conditions. This effect mainly reflected in the river flow velocity within the larger (including lower water levels and flow greater) when pollutants spread rapidly downstream, small changes in the concentration of pollutants duration of growth.

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Sediment dynamics, River Dynamics > Fluvial > Evolution and forecast of hydraulic structures downstream river
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