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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Analysis of Storm Pattern for Design Urban Drainage System in the Monsoon Areas of Vietnam
Author(s)
Bui Thi Thu Trang1, Nguyen Thi Hong Hanh1, Nguyen Thi Hoai Thuong1 and Nguyen Van Thuan2
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DOI:10.17265/2162-5298/2018.02.001
Affiliation(s)
1. Faculty of Environment, Hanoi University of Natural Resources and Environment, Hanoi 100000, Vietnam
2. Department of General Affairs, State Audit Office of Vietnam, Hanoi 100000, Vietnam
ABSTRACT
In Vietnam, rainfall data usually received using daily rainfall at all hydrology
stations with higher time resolution are scarce. However, its
analyses to achieve IDF (Intensity-Duration-Frequency) curves are often required at a finer scale such as hourly. Therefore, it needs to develop and apply
methods to derive the IDF characteristics of short-duration events from daily
rainfall statistics in Vietnam. In recent years, the need for new insights
into the rainfall process leading to new approaches to model the distribution
of rainfall intensities in time and space was recognized. This research aims to establish IDF curves for monsoon climate
area in Vietnam based on scaling method. Scaling properties of extreme
rainfall are examined in the Red River Delta of Vietnam in order to establish
scaling behavior of statistical moments over different durations. Such scaling
or scale-invariant models enable us to scale data from one temporal resolution
to another, and thus, help to overcome the lack of the extreme rainfall data of
sub-daily durations. The disaggregation or downscaling techniques are used to
obtain sub-daily rainfall data from daily rainfall data for the derivation of
scaled IDF curves. Research results show that most of rainfall amount
(approximately 70%) received from rains occurring between 6:0 pm to 6:0 am of the day after that, the daytime usually
less rainfall occurrence with only 30%. The peak rainfall is usually occurred
during 0:0 am to 4:0 am having approximately 42.98% of rainfall
amount over a day. The peak rainfall likely happen earlier in the recent year
(36% rainfall amount over a day occurrence from 6:00 pm to 10:00 pm in 2008). The analysis also illustrated that approximately 40% of
rainfall events have duration less than 60 minutes. In contrast,
only approximately 9% of rainfall events have duration more than 6 hours but total rainfall depths of these events is
approximately.
KEYWORDS
IDF (Intensity-Duration-Frequency) curves, design rainfall for urban, design rainfall in the Monsoon areas.
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