入湖河流尾闾河段界定方法研究

Research on method of defining tail-reach of inflowing river

针对从地理区域划分的角度界定入湖河流尾闾河段的范围常常与实际不符的情况,通过分析枯、丰两期入湖河流与湖泊之间的水动力学作用关系,结合水动力学模型及水流连续性方程,提出入湖河流尾闾河段动态界定方法。并以湘江为例,通过该方法界定出湘江入洞庭湖尾闾河段的范围,结果表明,湘江入洞庭湖尾闾河段的范围距离濠河口100 km的湘潭水文站位置处,与实际调查情况相吻合。科学界定尾闾河段距离,为相应河段水资源综合利用与保护奠定理论基础,并可为其他自然通江通湖河流尾闾河段范围的界定所借鉴。

Aiming at the situation that the definition of the scope of the tail-reach of inflowing river is often not conformed to the actual condition from the aspect of geographical plotting, a dynamic definition method of the tail-reach of inflowing river is put for- ward herein based on the hydrodynamic model and continuity equation of flow concerned through the analysis on the hydrodynamic correlation between inflowing river and lake during both the wet and the dry seasons. Furthermore, by taking Xiangjiang River as a study case, the scope of the tail-reach of the river into Dongting Lake is defined with this method. The result shows that the scope of the tail-reach of Xiangjiang River into Dongting Lake at Xiangtan Hydrological Station 100 km from the moth of Haohe River is well accord with that from the actual investigation. The scientific definition of the distance of the tail-reach of the river lays a theoretical basis for the comprehensive utilization and protection of the water resources therein, and then can also provide a reference for the definitions of the tail-reaches of the other natural rivers flowing into larger rivers or lakes.