Purpose

The purpose of this study is to evaluate the rainfall intensities and their limits for durations from 0.25 to 8 h with return periods from 2 to 100 years for Ca Mau City in Vietnam.

Design/methodology/approach

First, the quality of the historical rainfall data series in 44 years (1975–2018) at Ca Mau station was assessed using the standard normal homogeneity test and the Pettitt test. Second, the appraised rainfall data series are used to establish the rainfall intensity-duration-frequency curve for the study area.

Findings

Based on the findings, a two-year return period, the extreme rainfall intensities (ERIs) ranged from 9.1 mm/h for 8 h rainstorms to 91.2 mm/h for 0.25 h. At a 100-year return period, the ERIs ranged from 18.4 mm/h for 8 h rainstorms to 185.8 mm/h for 0.25 h. The results also show that the narrowest uncertainty level between the lower and upper limits recorded 1.6 mm at 8 h for the two-year return period while the widest range is at 42.5 mm at 0.25 h for the 100-year return period. In general, the possibility of high-intensity rainfall values compared to the extreme rainfall intensities is approximately 2.0% at the 100-year return period.

Originality/value

The results of the rainfall IDF curves can provide useful information for policymakers to make the right decisions in controlling and minimizing flooding in the study area.

中文翻译：

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模拟气候变化影响下的卡茂沿海地区的降雨IDF曲线，用于洪水预警

目的

这项研究的目的是评估越南Ca Mau市的降雨强度及其持续时间为0.25至8 h，返回期为2至100年的极限。

设计/方法/方法

首先，使用标准的正常均一性检验和Pettitt检验评估了Ca Mau站44年（1975-2018年）的历史降雨数据系列的质量。其次，利用评估的降雨数据序列建立研究区域的降雨强度-持续时间-频率曲线。

发现

根据调查结果，在为期两年的回归期中，极端降雨强度（ERI）从8小时暴雨的9.1毫米/小时到0.25小时的91.2毫米/小时不等。在100年的恢复期中，ERI范围从8小时暴雨的18.4毫米/小时到0.25小时的185.8毫米/小时。结果还显示，在两年回归期的8 h时，上下限之间的最窄不确定度记录为1.6 mm，而对于100年回归期的最宽范围在0.25 h时为42.5 mm。通常，在100年的回归期中，与极端降雨强度相比，高强度降雨值的可能性约为2.0％。

创意/价值

降雨IDF曲线的结果可以为决策者提供有用的信息，以便他们在控制和最小化研究区域的洪水方面做出正确的决策。