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首页> 外文会议>International Conference on Water and Environment(WE-2003); 20031215-18; Bhopal(IN) >Design Rainstorm Of Peninsular Malaysia: Regional Frequency Analysis Approach
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Design Rainstorm Of Peninsular Malaysia: Regional Frequency Analysis Approach

机译：马来西亚半岛的设计暴雨：区域频率分析方法

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Estimates of high intensity rainfall are very important in rainfall-runoff modelling with respect to design flood estimation. Instead the use of at-site estimation approach, regional estimation has been recommended in order to reduce the uncertainties and to overcome unavailability of long data records particularly for estimation of design rainstorm. In this study the regional frequency analysis focused on rainfall analysis that was based on the theory of L-moments. The process involved four stages of the analysis namely screening of the data, identification of homogeneous regions, choices of a regional frequency distribution and estimation of the frequency distribution. Annual maximum model of rainfall series were extracted for 0.25-hour to 72-hour duration of 53 rainfall stations throughout Peninsular Malaysia. Analysis was conducted in accordance to the index flood approach where in this case the index flood was replaced by the index rainfall. The main objective was focused on the development of a dimensionless regional frequency curve or growth curve (X_T), representing the ratio of extreme rainfall of any return period to an index rainfall (R_T/R_D). The second objective was to develop the index rainfall estimation tools with establishment of the relations 24-hour index rainfall and site characteristics, and to produce index rainfall map. In order to estimate specific duration index rainfall, the index rainfall factor-duration curves were developed. These approaches are use to estimate the index rainfall at ungauged site. The results from this study in the region of Peninsular Malaysia revealed that of the nine cases of the rainstorm investigated, only ! -hour duration could be categorized as homogeneous' regions. The robustness study shows the bias and RMSE values were small, even though in the case of heterogeneous region. The GLO and GEV are the best regional frequency distributions for the cases of 0.25 to 1 hour duration and 3 to 72 hour duration of AM series respectively. The most important finding, however, contributed by the index rainstorm factor (R_D/ R_(24)) that means daily readings from manual stations could be fully utilized by converting them into shorter duration rainfall.
机译：在设计径流估算方面，高强度降雨的估算在降雨径流建模中非常重要。取而代之的是使用现场估计方法，建议使用区域估计，以减少不确定性并克服长数据记录的不可用性，特别是用于设计暴雨的估计。在这项研究中，区域频率分析集中在基于L矩理论的降雨分析上。该过程涉及分析的四个阶段，即筛选数据，识别均匀区域，选择区域频率分布和估计频率分布。在整个马来西亚半岛的53个降雨站中，提取了0.25年至72小时的年度最大降雨序列模型。根据指数洪水法进行分析，在这种情况下，指数洪水被指数降雨代替。主要目标集中在发展无量纲区域频率曲线或增长曲线（X_T）上，该曲线表示任何回归期的极端降雨与指数降雨（R_T / R_D）之比。第二个目标是通过建立24小时指数降雨与站点特征之间的关系来开发指数降雨估算工具，并制作指数降雨图。为了估计特定持续时间指数降雨，制定了指数降雨因子持续时间曲线。这些方法用于估计未开垦地点的指数降雨。在马来西亚半岛地区的这项研究结果表明，在调查的9例暴雨中，只有！小时的持续时间可以归类为同类区域。鲁棒性研究表明，即使在异质区域的情况下，偏差和RMSE值也很小。对于AM系列，分别在0.25至1小时持续时间和3至72小时持续时间的情况下，GLO和GEV是最佳的区域频率分布。然而，最重要的发现是由指数暴雨因子（R_D / R_（24））贡献的，这意味着将手动站的每日读数转换为较短持续时间的降雨可以得到充分利用。

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