Abstract
The traditional flood season division method is cumbersome. In order to make the flood season division elaborate, the Mann–Kendall and cumulative sum of rank difference (CSD) methods were used to detect the abrupt change year of precipitation (p) over the study area from 1969 to 2015. The year of change was determined to be 1995. Taking the 1995 year as a demarcation point of the data, the discriminant model and Fisher optimal partition method were applied for flood division, and a comparison of the results from the two approaches were compared. The discriminant model was found to perform slightly better than the Fisher approach. It was found that abrupt rainfall change has a certain influence on flood season division. The main flood season in the Zhangjia Zhuang reservoir during 1969–2015 was 16 days longer than during 1996–2015, but three days shorter than between 1969–1995. For the Zhangjia Zhuang Reservoir, the flood water level limit can increase up to 2 m according to the results of the flood season division and designed rainfall after abrupt change; in addition, the water storage capacity is 469 million m³ more than that of the traditional reservoir operation mode.
Highlights
Rainstorms and floods are more distinct from one another during different periods, and the flood season is divided into several periods, on the basis of accounting for the law of this difference [1].In practical work, it is of great significance to rationally determine the stages of the flood season, which is the precondition for reservoir flood control, and is of great significance to the rational application of flood control and water resources in the basin and reservoir [2]
The daily precipitation data of Zhangjia Zhuang Reservoir from June to September are analyzed in detail
The results show that the results of the flood season division obtained by the discriminant model can better reflect the actual situation, and be more detailed and reasonable
Summary
Rainstorms and floods are more distinct from one another during different periods, and the flood season is divided into several periods, on the basis of accounting for the law of this difference [1].In practical work, it is of great significance to rationally determine the stages of the flood season, which is the precondition for reservoir flood control, and is of great significance to the rational application of flood control and water resources in the basin and reservoir [2]. Rainstorms and floods are more distinct from one another during different periods, and the flood season is divided into several periods, on the basis of accounting for the law of this difference [1]. The long series of rainfall and runoff data have often been used to divide the flood season, and factors such as climate change and extreme weather were not considered [3]. A large number of studies show that the trend of global warming is remarkable in the past hundred years. Climate change is a global issue that impacts every living being in the world. One of the most noticeable consequences of this global phenomenon is the inevitable water cycle modification, with precipitation being a major component in these processes [5]
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