辽河(铁岭段)水文情势演变规律研究

Study on evolution laws of hydrologic regime in Tieling section of Liaohe river

文中结合河流生态水文学理论,采用IHA/RVA法对辽河铁岭段水文情势变化规律进行研究,并重点对清河、柴河水库建库前后水文情势变异性进行分析。结果表明:随着人类活动的加强,辽河铁岭段水文情势发生明显变化,除个别月份外,月流量呈下降趋势;年最大流量呈下降趋势,发生时间提前;最小流量略呈下降趋势,发生时间滞后;高低流量持续时间、涨幅、降幅率及改变次数均呈下降趋势,径流过程坦化。清河、柴河水库建库前后IHA的33个指标中,共有2个指标属于高度改变,16个指标属于中度改变,15个指标属于低度改变,整体改变度为45.3%,属于中度改变。

Combining the ecological hydrology theory of the river,the paper studies the evolution laws of hy drologic regime in Tieling section of Liaohe river by using the IHA/RVA method,and analyzes the variation of hydrologic regime before and after the construction of Qinghe reservoir and Chaihe reservoir.The results show that the variation of hydrologic regime in Tieling section of Liaohe river is significant along with the strengthening of human activities.Most of the month discharge show the decrease tendency except for months,the annual maximum discharge shows decrease tendency with the time advance,the annual minimum discharge shows decrease tendency with the time delay.Keeping time,the increase and decrease rate and the change times of the high and low flow are all decrease with the smooth runoff process.In the 33 indexes of IHA before and after construction of Qinghe reservoir and Chaihe reservoir,2 indicators are high change,16 indicators are moderate change and 15indicators are low change,overall change degree are 45.3%,which is belong to the moderate change.