干旱区生态环境知识资源中心(Arid): Effect of the stream extraction threshold on the morphological characteristics of arid basins, fractal dimensions, and the hydrologic response

Arid

DOI	10.1016/j.jafrearsci.2020.103968
	Effect of the stream extraction threshold on the morphological characteristics of arid basins, fractal dimensions, and the hydrologic response
	Al-Wagdany, Abdullah; Elfeki, Amro; Kamis, Ahmed Samy; Bamufleh, Sameer; Chaabani, Anis
通讯作者	Kamis, AS (corresponding author), King Abdulaziz Univ, Fac Meteorol Environm & Arid Land Agr, Dept Hydrol & Water Resources Management, POB 80208, Jeddah 21589, Saudi Arabia.
来源期刊	JOURNAL OF AFRICAN EARTH SCIENCES
ISSN	1464-343X
EISSN	1879-1956
出版年	2020
卷号	172
英文摘要	This paper presents the effect of the threshold (S) used in the extraction of the stream network on the morphological characteristics, fractal dimensions, and the hydrologic response of arid basins. Four basins with areas vary between 252 and 2726 km(2) are considered as a sample in Makkah Al-Mukarramah region, Saudi Arabia (SA). Three different values of the threshold are used for each basin: 0.5 km 2 , 1.0 km(2), and 2.0 km(2). The methodology estimated the fractal dimensions of the mainstream and the stream network of the basins based on Horton-Strahler ratios and compared them with measurements from GIS software using the box-counting technique. Two theoretical procedures were used to compute the fractal dimensions. The fractal dimension of the mainstream (d2) is closer to the measured (d) when compared to (d1). Both d1 and d2 overestimated the d values. In contrast, the fractal dimension of the stream network (D1) is closer to the measured (D) values when compared to D2. Both D1 and D2 overestimated D. The values of d range between 1.05 and 1.13 while the D values range between 1.36 and 1.71. Based on the theory of geomorphological instantaneous unit hydrograph (GIUH), it has been shown that the GIUH varies depending on the threshold. The computed GIUH parameters for different thresholds showed that the values of the peak discharge (q(p)) varies between 0.46 and 1.96 (1/hour) and the values of time to peak (t(p)) varies between 0.28 and 1.11 hour. The comparison between observed and estimated storm hydrographs of the gauged Dara basin showed high variability with different thresholds. The relative error (RE) in peak discharge (Q(p)) varies between 0 and 59%. While the RE in runoff volume varies between -7.9% and -58.4%. The RE in lag time (T-lag) varies between 6.3% and -275%. The GIUH based on gamma distribution seems not to be a representative model to the hydrographs in arid regions and other models should be investigated. A new approach has to be followed to develop a GIUH that does not depend on the threshold or finding an appropriate threshold that can be used for accurate flood predictions.
英文关键词	Flash floods Horton's ratio Scale effect GIUH Fractal dimension
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000590387100015
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348955
作者单位	[Al-Wagdany, Abdullah; Elfeki, Amro; Kamis, Ahmed Samy; Bamufleh, Sameer; Chaabani, Anis] King Abdulaziz Univ, Fac Meteorol Environm & Arid Land Agr, Dept Hydrol & Water Resources Management, POB 80208, Jeddah 21589, Saudi Arabia
推荐引用方式 GB/T 7714	Al-Wagdany, Abdullah,Elfeki, Amro,Kamis, Ahmed Samy,et al. Effect of the stream extraction threshold on the morphological characteristics of arid basins, fractal dimensions, and the hydrologic response[J],2020,172.
APA	Al-Wagdany, Abdullah,Elfeki, Amro,Kamis, Ahmed Samy,Bamufleh, Sameer,&Chaabani, Anis.(2020).Effect of the stream extraction threshold on the morphological characteristics of arid basins, fractal dimensions, and the hydrologic response.JOURNAL OF AFRICAN EARTH SCIENCES,172.
MLA	Al-Wagdany, Abdullah,et al."Effect of the stream extraction threshold on the morphological characteristics of arid basins, fractal dimensions, and the hydrologic response".JOURNAL OF AFRICAN EARTH SCIENCES 172(2020).