荆江—洞庭湖河网一二维嵌套水动力学模型研究
发布时间：2018-08-19 11:22
【摘要】：荆江-洞庭湖构成的具有复杂时空变化特点的江湖水系对长江防洪体系有着重要影响。自三峡水库蓄水运用以来,荆江干流以及向洞庭湖三口分流过程发生了新的调整,因此在一定程度上改变了原有的防洪形势。为应对荆江-洞庭湖水系关系的变化,需要能够准确模拟河道、湖泊内各种复杂水流运动过程,建立了荆江-洞庭湖区一、二维嵌套水动力学模型,对荆江和三口河系模拟采用一维河网模型,洞庭湖区采用二维浅水湖泊模型。本嵌套模型是以边界搭接的水量交换方式连接一、二维模型,即一维模型为二维模型的提供上游流量边界;二维模型为一维模型提供下游水位边界,模型之间能互相传递物理量,并依据边界水力因子相等原则,实现互赋边界迭代计算。利用2008年全年荆江干流上监利、螺山站,三口河道的新江口、沙道观站、弥陀寺以及洞庭湖区内的鹿角站的实测水文资料对模型进行率定,利用2012年的实测水文资料对模型进行验证。同时模拟计算了洞庭湖丰、枯水期的流场,湖区主体表层水流流向是从目平湖-南洞庭湖-东洞庭湖,最终由城陵矶流出,接着汇入长江。丰水期水体几乎被置换,而枯水期"死水"现象明显。模型在水位、流量、断面流速过程3方面的验证结果显示,无论是在荆江干流、分洪水系还是洞庭湖区,模拟结果均与实测资料吻合较好,峰谷对应关系明显。嵌套模型选取的糙率等参数准确,技术处理到位,具有较高的精度,能较好反映整个荆江-洞庭湖区的水流运动过程。同时模型可用于荆江-洞庭湖区不同组合类型洪水过程的计算,对三峡调度影响下的荆江防洪预测有着重要参考价值。
[Abstract]:The river and lake system composed of Jingjiang River and Dongting Lake with complex temporal and spatial variation has an important influence on the flood control system of the Yangtze River. Since the storage and operation of the three Gorges Reservoir, new adjustment has taken place in the main stream of Jingjiang River and its diversion to Dongting Lake, which has changed the original flood control situation to a certain extent. In order to cope with the change of water system relationship between Jingjiang and Dongting Lake, it is necessary to simulate accurately various complex flow processes in rivers and lakes, and a 2-D nested hydrodynamic model for Jingjiang-Dongting Lake region is established. One dimensional river network model is used for simulation of Jingjiang River and three river systems, and two dimensional shallow lake model is used for Dongting Lake area. The nested model is connected by the water exchange method of boundary overlap. The two-dimensional model provides upstream discharge boundary for the two-dimensional model, and the two-dimensional model provides the downstream water level boundary for the one-dimensional model, and the one-dimensional model provides the upstream flow boundary for the two-dimensional model. The models can transfer physical quantities to each other and calculate the boundary iteratively according to the principle of equal boundary hydraulic factor. Based on the measured hydrological data of Jianli, Luoshan Station, Xinjiang Estuary of three Rivers, Sand Daoguan Station, Mituo Temple and antler Station in Dongting Lake District in 2008, the rate of the model is determined. The model is verified by the measured hydrological data in 2012. At the same time, the flow field of Dongting Lake during the periods of abundant and dry water is simulated and calculated. The flow direction of the main surface water flows from Muping Lake to South Dongting Lake to East Dongting Lake, and finally flows out from Chenglingji and then flows into the Yangtze River. The water was almost replaced in the high water period, but the "dead water" phenomenon was obvious in the dry season. The verification results of the model in three aspects of water level, discharge and cross-section velocity process show that the simulation results are in good agreement with the measured data, whether in the Jingjiang main stream, flood diversion system or Dongting Lake area, and the corresponding relationship between peak and valley is obvious. The parameters such as roughness selected by the nested model are accurate, the technical treatment is in place, and the accuracy is high, which can better reflect the flow motion process of the whole Jingjiang-Dongting Lake region. At the same time, the model can be used to calculate the flood process of different combination types in Jingjiang-Dongting Lake area, which has an important reference value for the flood control prediction of Jingjiang River under the influence of three Gorges operation.
【作者单位】： 中南大学地球科学与信息物理学院/有色金属成矿预测与地质环境监测教育部重点实验室;中南民族大学资源与环境学院;长江水利委员会水文局;河海大学水文水资源与水利工程科学国家重点实验室;华中科技大学水电与数字化工程学院;
【基金】：国家自然科学基金项目(51509273) 水文水资源与水利工程科学国家重点实验室开放研究基金项目(2015491111) 中南民族大学中央高校基本科研业务专项资金资助项目(CZW15072,CZW15126)
【分类号】：TV131.2
本文编号：2191508
[Abstract]:The river and lake system composed of Jingjiang River and Dongting Lake with complex temporal and spatial variation has an important influence on the flood control system of the Yangtze River. Since the storage and operation of the three Gorges Reservoir, new adjustment has taken place in the main stream of Jingjiang River and its diversion to Dongting Lake, which has changed the original flood control situation to a certain extent. In order to cope with the change of water system relationship between Jingjiang and Dongting Lake, it is necessary to simulate accurately various complex flow processes in rivers and lakes, and a 2-D nested hydrodynamic model for Jingjiang-Dongting Lake region is established. One dimensional river network model is used for simulation of Jingjiang River and three river systems, and two dimensional shallow lake model is used for Dongting Lake area. The nested model is connected by the water exchange method of boundary overlap. The two-dimensional model provides upstream discharge boundary for the two-dimensional model, and the two-dimensional model provides the downstream water level boundary for the one-dimensional model, and the one-dimensional model provides the upstream flow boundary for the two-dimensional model. The models can transfer physical quantities to each other and calculate the boundary iteratively according to the principle of equal boundary hydraulic factor. Based on the measured hydrological data of Jianli, Luoshan Station, Xinjiang Estuary of three Rivers, Sand Daoguan Station, Mituo Temple and antler Station in Dongting Lake District in 2008, the rate of the model is determined. The model is verified by the measured hydrological data in 2012. At the same time, the flow field of Dongting Lake during the periods of abundant and dry water is simulated and calculated. The flow direction of the main surface water flows from Muping Lake to South Dongting Lake to East Dongting Lake, and finally flows out from Chenglingji and then flows into the Yangtze River. The water was almost replaced in the high water period, but the "dead water" phenomenon was obvious in the dry season. The verification results of the model in three aspects of water level, discharge and cross-section velocity process show that the simulation results are in good agreement with the measured data, whether in the Jingjiang main stream, flood diversion system or Dongting Lake area, and the corresponding relationship between peak and valley is obvious. The parameters such as roughness selected by the nested model are accurate, the technical treatment is in place, and the accuracy is high, which can better reflect the flow motion process of the whole Jingjiang-Dongting Lake region. At the same time, the model can be used to calculate the flood process of different combination types in Jingjiang-Dongting Lake area, which has an important reference value for the flood control prediction of Jingjiang River under the influence of three Gorges operation.
【作者单位】： 中南大学地球科学与信息物理学院/有色金属成矿预测与地质环境监测教育部重点实验室;中南民族大学资源与环境学院;长江水利委员会水文局;河海大学水文水资源与水利工程科学国家重点实验室;华中科技大学水电与数字化工程学院;
【基金】：国家自然科学基金项目(51509273) 水文水资源与水利工程科学国家重点实验室开放研究基金项目(2015491111) 中南民族大学中央高校基本科研业务专项资金资助项目(CZW15072,CZW15126)
【分类号】：TV131.2
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