鄱阳湖枯水水位及流速时空分布模拟

发布时间：2018-05-21 11:08

本文选题：鄱阳湖 + 水位　；参考：《长江流域资源与环境》2017年04期

【摘要】：大型通江湖泊鄱阳湖水文节律独特,水位和流速是其生态系统功能维持的关键因子。为探究其水位和流速时空特征,基于EFDC(Environmental Fluid Dynamics Code)模型,利用五河及湖口水文数据、气象数据及湖底高程作为输入条件,模拟出鄱阳湖的枯水水文统计年(2010-07-01~2011-06-30)水位和流速时空变化过程。模拟结果表明:(1)星子等4个站点拟合程度较好(r20.85),达到了复杂湖库水动力模拟的精度。(2)高水位期,湖区水位空间分布无明显差异,水深直接受湖底高程影响,自上游至下游呈逐级递增;低水位期,鄱阳湖水位在空间上出现明显差异,湖区外缘水位至入江水道逐级递减,水深分布空间差异不大,仅入江水道处水深明显高于其他水域。(3)流速也包括一系列时空变化特征,如高水位时期流速小于低水位时期;除大水面时期外,深水道流速大于主湖区;高水位时期上游流速略高于下游,但其他月份,北部入江水道流速均大于南部湖区等。(4)流速与水位关系密切,且不同水位对应流速大小及分布有所差异。鄱阳湖枯水水位和流速模拟分析可为大型湖库枯水水情管理提供科学参考和辅助决策支持。
[Abstract]:The hydrological rhythm of large Tongjiang Lake Poyang Lake is unique. Water level and flow velocity are the key factors for the maintenance of its ecosystem function. In order to explore the spatial and temporal characteristics of its water level and flow velocity, based on the EFDC (Environmental Fluid Dynamics Code) model, the hydrological data of five rivers and Hukou, the meteorological data and the lake bottom elevation are used as the input conditions to simulate the Poyang Lake. The time and space variation process of water level and flow velocity in the dry water hydrology year (2010-07-01~2011-06-30). The simulation results show that (1) the 4 stations, such as stars, have a better fitting degree (r20.85), and the accuracy of the hydrodynamic simulation of the complex lake reservoir is achieved. (2) there is no obvious difference in the spatial distribution of the water level in the lake area, and the water depth is directly affected by the height of the lake bottom, from the upstream to the upper level. In the low water stage, the water level in Poyang Lake is obviously different, and the water level of the lake area is obviously different. The water level of the lake area is reduced gradually, and the spatial difference of the water depth is not very different. (3) the velocity of the river is obviously higher than that of the other waters. (3) the flow velocity also includes a series of temporal and spatial variation characteristics, for example, the flow velocity in the high water level is less than the low water level. In addition to the large water level, the flow velocity of the deep water channel is greater than the main lake area. The flow velocity in the upper reaches of the high water level is slightly higher than that of the lower reaches, but the flow velocity in the northern river channel is greater than that of the southern Lake area. (4) the flow velocity is closely related to the water level, and the different water level is corresponding to the velocity and distribution of the flow rate. The simulation analysis of the water level and flow rate of the dry water in Poyang Lake can be large It provides scientific reference and auxiliary decision support for the management of the low water condition of the type lake reservoir.
【作者单位】：中国科学院流域地理学重点实验室中国科学院南京地理与湖泊研究所;中国科学院大学;江西省鄱阳湖水文局;
【基金】：国家重点基础研究发展计划项目(2012CB417006) 江西省水利厅重大水利科技项目(KT201406)~~
【分类号】：P333.3

【相似文献】