研究论文
李健,杨文俊,金中武.应用三维粒子轨迹跟踪模型模拟香溪河水藻增殖过程[J].环境科学学报,2014,34(2):481-487
应用三维粒子轨迹跟踪模型模拟香溪河水藻增殖过程
- A three dimensional particle tracking model for simulation of Xiangxi River algal bloom process
- 基金项目：国家自然科学基金青年基金项目（No. 51309021）
- 作者
- 单位
- 李健
- 1. 长江水利委员会长江科学院河流研究所, 武汉 430010;2. 三峡地区地质灾害与生态环境湖北省协同创新中心, 宜昌 443002
- 杨文俊
- 1. 长江水利委员会长江科学院河流研究所, 武汉 430010;2. 三峡地区地质灾害与生态环境湖北省协同创新中心, 宜昌 443002
- 金中武
- 1. 长江水利委员会长江科学院河流研究所, 武汉 430010;2. 三峡地区地质灾害与生态环境湖北省协同创新中心, 宜昌 443002
- 摘要：三峡工程建成后将改变库区的水动力条件，会对库区及支流的水生态环境产生重要影响.因此，本文应用三维非结构海洋动力学模型ELcirc，以及考虑营养物质浓度、水温、水下光照强度和流速等因素影响水藻增殖的粒子轨迹跟踪模型模拟三峡库区支流香溪河的水流及水藻颗粒的输移.同时，采用室内弯道水槽试验资料对模型进行了验证，计算结果表明，验证后的模型可以较为精确地模拟弯道水流运动特性和弯道水流中的物质输移现象.采用验证后的模型研究了2007年9—10月三峡水库蓄水期香溪库湾的水流及藻类颗粒物质输移，结果表明，长江干流水体倒灌入香溪库湾产生回流，藻类颗粒向上游运动，考虑水藻生长过程的三维粒子轨迹跟踪模型可以较好地模拟水藻颗粒的垂向分布及水藻生长的水华过程.
- Abstract：The operation of Three Gorges Reservoir (TGR) causes dramatic change to hydrodynamic condition and aquatic ecological environment in TGR and some tributaries. The three-dimensional unstructured-mesh oceanic model ELcirc coupled with a particle tracking model (PTM) was applied for simulating the flow and algal cells transportation in Xiangxi River (XXR) one tributary of Yangtze River. PTM took consideration of nutrients' concentrations, water temperature, underwater light attenuation and flow velocity affecting algal reproduction process. Flume experiment data was used to verify the model and the results showed a good description of flowing and mass transportation in curved flume. The XXR algal bloom from September to October 2007, the period that TGR began to impound, was simulated. The modeling results show that backflow from the Yangtze's main stream into XXR occurred, and algae particles were pushed to the upstream. The PTM considering the algal reproduction could be used to simulate the vertical distribution and reproduction process of algae in XXR.
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