Mathematical model for interactions and transport of phosphorus and sediment in the Three Gorges Reservoir.
Mathematical model for interactions and transport of phosphorus and sediment in the Three Gorges Reservoir.
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DOI：
10.1016/j.watres.2015.08.049
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发表时间：
2015-11
期刊：
影响因子：
12.8
通讯作者：
Lei Huang;H. Fang;D. Reible
中科院分区：
文献类型：
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作者：
Lei Huang;H. Fang;D. Reible
磷在自然沃茨中的迁移和归宿在河流和水库生态中起着至关重要的作用。本文建立了一个水动力、泥沙输移和磷素输移的耦合模型，详细考虑了泥沙对磷素输移的影响。磷的吸附估计使用机械表面络合模型，能够模拟各种水化学条件下的吸附特性。沉积动力学分析，以评估沉积和释放的磷在床面。此外，还区分了沉积物的好氧层和厌氧层，研究了活性沉积层中磷在溶解相和颗粒相之间的分配。应用该模型对三峡水库不同运行方式对泥沙和磷的截留效果进行了评价。结果表明，该模型能较好地反映三峡库区磷素随泥沙的运移规律，影响三峡库区泥沙滞留的管理措施也会影响三峡库区磷素平衡。然而，适度的操作变化，对沉积物截留的影响很小，对磷平衡的影响也很有限。
Phosphorus fate and transport in natural waters plays a crucial role in the ecology of rivers and reservoirs. In this paper, a coupled model of hydrodynamics, sediment transport, and phosphorus transport is established, in which the effects of sediment on phosphorus transport are considered in detail. Phosphorus adsorption is estimated using a mechanistic surface complexation model which is capable of simulating the adsorption characteristics under various aquatic chemistry conditions. The sediment dynamics are analyzed to evaluate the deposition and release of phosphorus at the bed surface. In addition, the aerobic layer and anaerobic layer of the sediments are distinguished to study the distribution of phosphorus between dissolved and particulate phases in the active sediment layer. The proposed model is applied to evaluate the effects of various operating rules on sediment and phosphorus retention in the Three Gorges Reservoir (TGR). Results show that the proposed model can reasonably reflect the phosphorus transport with sediment, and management scenarios that influence sediment retention will also influence the phosphorus balance in the TGR. However, modest operational changes which have only minor effects on sediment retention also have limited influence on the phosphorous balance.