On the local-scale spatial variability of daily summer rainfall in the humid and complex terrain of the Blue Nile: observational evidence

被引：10

作者：

Bitew, Menberu M. ^{[1
]}

Gebremichael, M. ^{[1
]}

Hirpa, F. A. ^{[1
]}

Gebrewubet, Y. M. ^{[2
]}

Seleshi, Y. ^{[2
]}

Girma, Y. ^{[3
]}

机构：

[1] Univ Connecticut, Dept Civil & Environm Engn, Storrs, CT 06269 USA

[2] Univ Addis Ababa, Dept Civil Engn, Addis Ababa, Ethiopia

[3] Debreberhan Res Ctr, Amhara Reg Agr Res Inst, Debreberhan, Ethiopia

来源：

HYDROLOGICAL PROCESSES | 2009年 / 23卷 / 26期

关键词：

rainfall; spatial variability; local scale; complex terrain;

D O I：

10.1002/hyp.7468

中图分类号：

TV21 [水资源调查与水利规划];

学科分类号：

081501 ;

摘要：

The HEXB'08 (Hydrological EXperiment in Blue Nile) experiment provided an opportunity, via dense network of rain gauges, to study the spatial variability of daily rainfall at a 5 km x 5 km scale in a humid and mountainous part of the Blue Nile river basin, for the period of 2 July-9 August 2008. The results of daily rainfall spatial analyses are shown in this paper. High-intensity rainfall events have more absolute spatial variability (as measured by standard deviation) and less relative spatial variability (as measured by coefficient of variation), compared to lower intensity events. The coefficient of variation of daily rainfall, computed using gauge-measured rainfall at several rain gauges, varies from 12% to 424%, with a median of 38% to 51%, indicating that there is a significant variability from one gauge observation to the other at the daily time scale, and one gauge does not represent 5 km x 5 km grid-average daily values. For rainfall events that had significant contribution to the total rainfall, the coefficient of variation is within 55%. (C) Copyright 2009 John Wiley & Sons, Ltd.

引用

页码：3670 / 3674

页数：5

共 7 条

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