基于区域回归分析法的浙江省洪水计算分区

以浙江省122个水文站历年最大洪峰流量与不同时段雨强、流域面积、河长、河床比降为指标,建立区域回归方程,利用该回归方程计算各水文站历年最大洪峰流量,并与实测值比较,结果表明计算值与实测值相关关系的分区规律明显,可将浙江省分为两个洪水计算区,计算值大于实测值的站点相对集中于钱塘江中上游、瓯江中上游、浦阳江、曹娥江等区域,占该区全部站点的69.5%;计算值小于实测值的站点相对集中于天目山、会稽山、四明山、天台山、大盘山、括苍山、南北雁荡山等呈"7"字形分布区域,占该区全部站点的73%。该分区结果与浙江省梅雨、台风雨以及土地利用、植被等分区总体吻合,表明分区结果是合理的,该分区方法具有可行性。

重庆市微型流域设计洪水计算方法

以2013~2017年重庆地区山洪灾害调查评价成果大数据为分析背景,提出了重庆市微型流域概念与无资料地区设计洪水计算方法;综合叠加各要素图层,经聚类分析、碎片整合确定了重庆地区微型流域设计洪水的六个分区;通过该计算方法进行分区设计洪水计算、修正,并利用洪水调查资料进行验证,形成了一套完整的覆盖重庆市微型流域“六分区五频率”设计洪水查算图集和经验公式;弥补了重庆市微型流域缺乏水文资料的现状,补全和细化了重庆地区流域设计洪水成果。

Trends of Extreme Flood Events in the Pearl River Basin during 1951-2010

The study investigated the trend of extreme flood events in the Pearl River basin during 1951-2010. Stream flow data at 23 gauging stations were used for the study. The Pearson type III distribution was selected for the flood frequency analysis. Results indicate that extreme flood events increase significantly in the Pearl River Basin since 1980. At the 23 gauging stations, there are 16 (70%) stations show positive (increasing) trends in 1981-2010. Most of the 16 stations are located along the West River and North River. While 7 (30%) stations show negative (decreasing) trends, and are found in the East River and the southeast region of the West River Basin.

西拉沐伦河设计洪水地区组成分析

文章以西拉沐伦河西拉西庙站为控制断面,结合工程设计实践对洪水地区组成问题进行了重点分析。