基于MIKE模拟计算的信江水库水质及水动力学演化特征分析

Analysis of water quality and hydrodynamic evolution characteristics of Xinjiang Reservoir based on MIKE simulation calculation

为研究信江水库水质影响特性及水动力演化特征,通过开展水库水质断面监测及影响性分析,对水库水质和建库前、后水位演化特征进行研究。结果表明:(1)影响水库水质COD含量、氨氮含量、TP含量的因素有工业化发展程度、降雨量以及农工业生产化。(2)建库后丰水年、平水年及枯水年全年水位分别呈"U"型、"倒S"型、"波浪线"型变化,枯水年建库后水位以及各月水位变化均为最低,全年最低、最高水位差距幅度仅为0.48%。(3)建库前水位以丰水年为最高,各测点在全年中整体变化幅度较小,而各测点中以下游测点水位最高,测点间距增大5km,断面水位平均可增大0.9%。研究结论为为水库水质治理及运营提供了重要依据。

In order to study the characteristics of water quality and hydrodynamic evolution of Xinjiang Reservoir,the water quality of the reservoir and the evolution characteristics of water level before and after the construction of the reservoir were studied by cross-section monitoring and influence analysis.The results show that:(1) the factors that affect the COD content,ammonia nitrogen content and TP content of the water quality of the reservoir are the degree of industrialization,rainfall and agricultural and industrial production.(2) After the construction of the reservoir,the annual water level showed a U-shaped inverted S-shaped wavy line change in the wet year and the dry year,respectively.The water level changed the lowest in the dry year after the construction of the reservoir and in each month,and the difference between the lowest and highest water level in the year was only 0.48%.(3) Before the construction of the reservoir,the water level is the highest in the wet year,and the overall variation range of each measuring point is small throughout the year.Among the measuring points,the water level of the downstream measuring point is the highest.The distance between measuring points increases by 5 km,and the water level of section can increase by 0.9% on average.The research results provide an important basis for water quality control and operation of the reservoir.