【摘要】 水温的变化会影响到水体的物理和化学性质，进而对水生生物的生存繁殖和水环境系统的生态平衡产生影响。为了研究大型水库水温分层结构的演变特征，基于CE-QUAL-W2模型建立山美水库垂向二维水温模型，从年、月尺度出发，分析了不同水文年、不同季节及月份水库垂直方向上的热分层结构。研究结果表明：山美水库水温存在季节性分层，分层持续时间约9个月。水库温跃层型式受入库流量影响，入流增加容易导致垂向水温呈现双温跃层结构；温跃层厚度夏季最大，冬季最小；深度变化与厚度相反，二者存在明显的负相关关系。丰水年受径流过程影响强烈，水体相对稳定性RWCS指数和分层时间小于平水年和枯水年。更多还原

【Abstract】 The change of water temperature affects physical and chemical properties of water body,and then the survival and reproduction of aquatic organisms and the ecological balance of aquatic environment system. A vertical two-dimensional water temperature model of Shanmei Reservoir was established based on CE-QUAL-W2 model, and the variation characteristics of thermal stratification structure of the reservoir in different hydrological years, seasons and months were analyzed. The results showed that there was seasonal water temperature stratification in the reservoir, which lasted for about nine months. The reservoir thermocline type was affected by the inflow, which easily led to a double thermocline structure in the vertical water temperature. The thickness of the thermocline was the largest in summer and the smallest in winter, while it showed opposite pattern for the depth of the thermocline.Dramatically affected by the inflow, the relative stability of the water body RWCS index and stratification time in wet year were less than normal year and dry year.更多还原