DYNHYD与WASP模型在复杂河网区的应用——以湖南省大通湖垸河湖连通为例

通过对湖南大通湖垸进行现场调查并结合河湖连通规划,针对自草尾河引水入东洞庭湖的连通方案,建立了DYNHYD与WASP水质耦合模型。模型参数确定后,模拟了在枯水典型水文年水位条件下,调水后的大通湖及各主要河渠总磷的浓度变化情况。分析模拟结果表明,大通湖达到预期Ⅲ类水标准所需的时间为135d,各河渠中总磷浓度达到预期标准所需的时间明显小于大通湖。分析方法和过程可为DYNHYD与WASP水质耦合模型在南方复杂水网地区河湖连通中的实际应用提供科学参考和实际指导。

Application of coupled water quality model of DYNHYD and WASP in complex river network area:case of river and lake connectivity in Datong Lake area in Hunan Province

Through field investigation of Datong Lake polders and in the combination with river-lake connection planning and scheme, aiming at the connection scheme of water diversion from Caowei River to East Dongting Lake, a coupled water quality model of DYNHYD and WASP is established. After the determination of model parameters, the model is used to calculate and simulate TP variation of Datong Lake and the main river channels under the condition of typical dry hydrology year. The analysis and simulation results show that in typical dry year, 135 days are need for TP content to reach the required classification III water of the Datong Lake, however the corresponding time in rivers is significantly longer. The analysis and process can provide refer-ence and practical guidance for application of the coupled model water quality of DYNHYD and WASP in southern complex river network area.