为研究吉林省伊通河生态需水量年内分配情况,采用流量历时曲线法分别对位于伊通河中下游的农安站及上游的伊通站的历史流量资料进行分析,得到伊通河农安站和伊通站的河道内最小生态需水量分别为4 693.66万 m3和303.52万 m3, 分别占年径流量的15.46%和4.80%;同时采用Tennant法和最小月流量平均法对伊通河最小生态需水量进行估算验证。Tennant法估算得到的最小生态需水量与流量历史曲线法较接近 。结果表明:在天然情况下,伊通河生态需水量的年内分配过程符合于实际水量分配过程,即多水时需水量多,少水时需水量少。农安段生态需水量可以有限地保护水生生物栖息地;而伊通段水生生物栖息地已经退化或贫瘠,需要采取措施对其进行保护治理。
Abstract
The distribution of ecological water demand of Yitong River within a year was investigated using flow duration curve method according to the historical flow data at Nong’an station and Yitong station. Nong’an Station is located in the mid-lower reaches of Yitong River, and Yitong station is in the upstream of Yitong river. Calculation results showed that the minimum ecological water demand at Nong’an station was 46.94 million m3, which accounts for 15.46% of the annual runoff; and the minimum ecological water demand at Yitong station was 3.04 million m3, taking up 4.80% of the annual runoff. Furthermore, the Tennant method and the average value of minimum monthly flow were used to estimate and verify the ecological water demand. The result obtained by Tennant method is close to the result by the flow duration curve method. The results indicate that the distribution of ecological water demand of Yitong River within a year is in correspondence with the practical water allocation, which means that the water demand is large in high flow period and small in low flow period. Through the ecological water demand, the aquatic habitats at Nong’an segment could be protected; whereas the aquatic habitats of Yitong segment have already degenerated and impoverished, and protective measures should be taken.
关键词
河道生态需水量 /
最小生态需水量 /
历时曲线法 /
伊通河 /
年内分配
Key words
ecological water demand of rivers /
minimum ecological water demand /
flow duration curve method /
Yitong River /
annual distribution
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