摘要
针对中小型水库抗暴雨能力预报中存在不确定性的问题,提出了一种考虑降水总量与降雨历时联合概率分布的降雨情景构建方法,旨在减轻抗暴雨能力计算中降雨历时及雨型不同对预报结果产生的影响,以实现中小型水库抗暴雨能力的概率预报。该方法基于Copula函数构建降水总量和降雨历时的联合分布,并与各历时下代表雨型结合,生成同一降水总量下不同历时的降雨过程及其概率;以概率降雨情景为输入,计算水库抗暴雨能力,最终得到水库抗暴雨能力的阈值区间及概率分布。实例验证结果表明,该方法考虑了不同历时降雨发生概率对入库径流的影响,可为中小水库抗暴雨能力的概率预报提供切实可行的降雨情景构建方法。
For the uncertainty in the forecast of rainstorm resistance capacity of small-and medium-sized reservoirs,a method of constructing rainfall scenarios considering the joint probability distribution of rainfall amount and duration was proposed,alleviating the impact of the difference in rainfall duration or rain type on the forecast result and realizing the probability forecast of rainstorm resistance capacity of small-and medium-sized reservoirs.A joint probability distribution of rainfall amount and duration was built based on the Copula function and combined with the corresponding rain type at each duration to generate rainfall processes and probabilities at the same rainfall amount.Taking the probabilistic rainfall scenario as the input,the rainstorm resistance capacity of reservoirs was calculated,and the threshold interval and probability distribution were obtained.The results of a case study show that the method considers the impacts of probabilities of different rainfall durations on inflow of reservoirs,and provides a feasible rainfall scenario construction method for the probability forecast of rainstorm resistance capacity of small-and medium-sized reservoirs.
作者
吴志勇
汪瑛琪
何海
李源
孙昭敏
WU Zhiyong;WANG Yingqi;HE Hai;LI Yuan;SUN Zhaomin(College of Hydrology and Water Resources,Hohai University,Nanjing 210098,China)
出处
《水资源保护》
EI
CAS
CSCD
北大核心
2022年第3期9-16,33,共9页
Water Resources Protection
基金
国家自然科学基金联合基金(U2240225)
国家重点研发计划(2017YFC1502403)。
关键词
抗暴雨能力
降雨情景
概率预报
COPULA函数
水库
rainstorm resistance capacity
rainfall scenario
probability forecast
Copula function
reservoir
