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sediment distribution pattern mapped from the combination of objective analysis and geostatistics in the large shallow Taihu Lake, China

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Journal of Environmental Sciences 2004年第6期16卷 908-911页

作者： LUOLian-cong QINBo-qiang ZHUGuang-wei NanjingInstituteofGeography＆Limnology ChineseAcademyofSciencesNanjing210008China

Investigation was made into sediment depth at 723 irregularly scattered measurement points which cover all the regions in Taihu Lake, China. The combination of successive correction scheme and geostatistical method was used to get all the values of recent sediment thickness at the 69×69 grids in the whole lake. The results showed that there is the significant difference in sediment depth between the eastern area and the western region, and most of the sediments are located in the western shore-line and northern regimes but just a little in the center and eastern parts. The notable exception is the patch between the center and Xishan Island where the maximum sediment depth is more than 4.0 m. This sediment distribution pattern is more than likely related to the current circulation pattern induced by the prevailing wind-forcing in Taihu Lake. The numerical simulation of hydrodynamics can strong support the conclusion. sediment effects on water quality was also studied and the results showed that the concentrations of TP, TN and SS in the western part are obviously larger than those in the eastern regime, which suggested that more nutrients can be released from thicker sediment areas.

关键词： objective analysis geostatistics sediment distribution Taihu Lake

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Three-dimensional eutrophication model and application to Taihu Lake,China

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Journal of Environmental Sciences 2008年第3期20卷 278-284页

作者： MAO Jingqiao CHEN Qiuwen CHEN Yongcan State Key Laboratory of Urban and Regional Ecology Research Centre for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Department of Hydraulic Engineering Tsinghua University Beijing 100084 China

Taihu Lake, the largest freshwater shallow lake in eastern China, has suffered from severe eutrophication over the past two decades. This research developed a three-dimensional eutrophication model to investigate the eutrophication dynamics. The model fully coupled the biological processes and hydrodynamics, and also took into account the effects of sediment release and the external loads from the tributaries. After sensitivity analyses, the key parameters were defined and then calibrated by the field observation data. The calibrated model was applied to study the seasonal primary productions and its regional differences. The comparisons between model results and field data in year 2000 indicated that the model is able to simulate the eutrophication dynamics in Taihu Lake with a reasonable accuracy. From the simulation experiments, it was found that the meteorological forcing have significant influences on the temporal variations of the eutrophication dynamics. The wind-induced circulation and sediment distribution play an important role in the spatial distribution of the algae blooms.

关键词： eutrophication dynamics algae bloom sediment distribution Taihu Lake

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Particle suspension in sediment-laden flow

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Progress in Natural Science:Materials International 2002年第7期 3-14页

作者： NI Jinren(Center for Environmental Sciences, Peking University The Key Laboratory of Water and sediment Sciences, Ministry of Education, Beijing 100871, China) Center for Environmental Sciences Peking University The Key Laboratory of Water and sediment Sciences Ministry of Education Beijing 100871 China

Many theories have been developed for predicting the vertical profiles of suspended sediment concentration in sediment-laden flows. An overview of various recent investigations is given herein. The generalization of the existing formulas and the interpretation of the typical sediment distributions are discussed in terms of continuum and kinetic concepts. The continuum assumption, which has been proved very successful for descriptions of liquid fluid motion, seems insufficient to describe motions of discrete solid particles in two-phase flows. Stochastic models can be used to approach the motion of the individual particles in the fluid, but are unsuitable for simulating interactions between solid particles. The analogy of kinetic theory in sediment-laden flows offers a promising alternative approach, and is expected for the applications in hyper-concentrated flow studies.

关键词： sediment distribution suspension generalization continuum concept kinetic theory.

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