基于集中度与集中期的径流年内分配研究

借鉴年降水量年内分配的向量法,描述径流年内分配的径流集中度和集中期,尝试提出一种计算河川径流年内分配不均匀性的定量新方法。实例研究表明,用月径流量计算的集中度比径流年内不均匀系数有更高的分辨能力和敏感性,用月径流量计算的集中期对应的月份与月径流最大值出现的实际月份完全一致,径流集中度、集中期能够充分定量地表征径流在年内分配的非均匀性。

Interannual Runoff Distribution Based on Degree and Time of Concentration for Rivers

Runoff-concentration degree(RCD)and runoff-concentration period(RCP)were defined by means of vector composition computing annual distribution of yearly precipitation.At the same time,the quantification method was proposed to describe and compute the non-uniformity in annual distribution of stream flows.Case study showed that the concentration degree calculated by monthly runoff volume had higher resolving power and sensitivity than that of non-uniform coefficient denoting annual runoff distribution.The month corresponding to runoff concentration period computed by monthly runoff was closely consistent with actual month in which maximum of monthly runoff appeared.It was proved that runoff concentration degree and concentration period could well display the non-uniformity in the annual distribution of runoff.The results above suggested that the method was feasible and the estimated result was believable.