基于鱼类保护目标的椒江环境流量研究

Using fish conservation as object to estimate environmental flow in Jiaojiang River

以鱼类为保护目标,通过建立概念模型将鱼类保护目标与流量之间的关系相联系,识别了与椒江鱼类保护目标相关的环境流量组成要素。采用FLOWS方法,计算了椒江2个断面的环境流量,柏枝岙断面的低流量为6.8～17.3 m3.s?1、高流量为22.2 m3.s?1,低流量脉冲为74 m3.s?1,高流量脉冲为110 m3.s?1,齐岸流量为948 m3.s?1;灵海断面的低流量为16.0～31.8 m3.s?1,高流量为46.0 m3.s?1,齐岸流量为2 488～3 184 m3.s?1。并得出每组环境流量出现时间、持续时间和出现频率等的推荐结果。与Tennant方法的计算结果比较,采用FLOWS计算方法能够反映环境流量的季节性变化特点,同时体现了环境流量与自然流量过程的一致性。此研究结果可为椒江的水资源合理利用与河流生态系统保护提供理论依据。

A relationship between fish conservation object and flow rate was developed using a concept model.In Jiaojiang River,fish was considered as the main conservation object in identifying the key components of environmental flow.Then environmental flow in two monitored sections was estimated via FLOWS method.In the Baozhiao section,the low,highest and full bank flows were 6.8～17.3 m3·s？1,22.2 m3·s？1 and 948 m3·s？1,respectively.Also the low and high flow pulses were 74 m3·s？1 and 110 m3·s？1,respectively.In the Linghai section,the low,high and full bank flows were 16.0～31.8 m3·s？1,46.0 m3·s？1 and 2 488～3 184 m3·s？1,respectively.The suitable environmental flow occurrence time,duration and frequency were also estimated.Compared with the Tennant method,the results from FLOWS method better reflected the seasonal characterizes of environmental flow in the river.The study also simulated the interconnection between environmental and natural flow.The findings therefore laid the theoretical basis for water resources utilization and fish conservation in Jiaojiang River.