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首页> 外文会议>International Conference on Water and Environment(WE-2003); 20031215-18; Bhopal(IN) >Frequency Analysis Of Rainfall: Inter-Comparison Of Plotting Position Formulae
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Frequency Analysis Of Rainfall: Inter-Comparison Of Plotting Position Formulae

机译：降雨频率分析：测绘位置公式的相互比较

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Frequency analysis of hydrologic events is very much essential in the solution of a variety of water-resource problems such as design of hydraulic structures, flood plain zoning, economic evaluation of flood protection projects, etc. In this paper the frequency analysis of annual rainfall is performed by the more commonly used plotting-position formulae such as California method, Hazen's method, Weibul method, Tukey method, Chegodayev method and Blom method. Observed annual rainfall data for the period of 65 years from 1935 to 2000 years at certain rain-gauge stations located in Cuddalore district, Tamil Nadu state are taken for the study. The return period of each observed annual rainfall magnitude at each of the rain-gauge stations taken for study is determined by each of the plotting-position formulae considered in the study. Logarithmic equations of the form P = a + b. ln (T_r) are fitted respectively to the observed annual rainfall magnitudes with return periods T_r for each station and for each of the plotting position formulae. The extrapolated values as estimated by different formulae are compared with the actual rainfall magnitudes. Plotting-position methods that give reliable estimates of rainfall for higher return periods are recommended.
机译：对水文事件进行频率分析对于解决各种水资源问题（例如水力结构设计，洪泛区划，防洪工程的经济评价等）非常重要。通过更常用的绘图位置公式（例如，加利福尼亚方法，哈岑方法，威布尔方法，图基方法，切戈达耶夫方法和布洛姆方法）执行。该研究取自位于泰米尔纳德邦库德达洛尔地区某些雨量计站的1935年至2000年65年期间的观测年降水量数据。在研究中使用的每个雨量计站处每个观测到的年降水量的返回期由研究中考虑的每个绘图位置公式确定。 P = a + b形式的对数方程。 ln（T_r）分别适合于每个站点和每个测绘位置公式的观测年降水量，并具有返回周期T_r。将用不同公式估算的外推值与实际降雨幅度进行比较。建议使用标绘位置方法，以提供可靠的高回报期降雨估计。

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