کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4577205 1630004 2012 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reducing the uncertainty in indirect estimates of extreme flash flood discharges
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Reducing the uncertainty in indirect estimates of extreme flash flood discharges
چکیده انگلیسی

SummaryDirect current meter measurements are rarely available for extreme flash floods. Corresponding discharges are generally estimated using so-called “indirect” techniques such as the slope – area method. These methods are based on empirical hydraulic formulae that typically use Manning’s equation, and have been calibrated and also widely tested for flow conditions that differ significantly from those encountered during flash floods. Recent work conducted in Europe, as part of the HYDRATE research project and other studies, has shown that the use of these formulae and their associated tabulated roughness values available in current guidance documents, without further verification, can lead to over-estimates of peak discharges in the case of flash floods. After having discussed the limitations of indirect methods based on Manning’s formula, the paper illustrates how the uncertainty in indirect discharge estimates can be reduced through the analysis of various types of data that can be collected during post-event surveys and through consistency checks. Based on a review of current literature and on recent flash flood studies, this paper proposes simple guidelines to assist practitioners in estimating extreme discharges during post-event surveys.


► In this paper, we examine the use of indirect methods to estimate flash flood flows.
► The use of standard Manning’s n roughness values can lead to over-estimates of extreme floods flows.
► We show that the mean maximum velocity and Froude number of extreme events are usually less than 3 m/s and 1, respectively.
► We propose guidelines to assist in validating and reducing the uncertainty in indirect flood estimates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrology - Volumes 414–415, 11 January 2012, Pages 16–30
نویسندگان
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