إستخدام نماذج الإرتفاعات الرقمية والطرق الإحصائية للمتغيرات المتعددة في تحليل المعاملات المورفومترية لبعض أودية غرب المملكة العربية السعودية

Subyani, Ali M.; Qari, Mohammed H.; Matsah, Mohamed

doi:10.1007/s12517-010-0149-7

Cited by 34 publications

(22 citation statements)

References 19 publications

(5 reference statements)

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“…This may be because the values of D d are lower in arid environments with low rainfall frequency than in humid areas [74]. These estimated D d values are consistent with estimates from other studies of arid environments (e.g., [19,20]). The relative similarity of the D f , F1 and D d values of the Wadi Qena sub-basins is probably due to their existence in the same wadi and the fact that they have been developed under relatively similar climatological conditions.…”

Section: Drainage Network Parameterssupporting

confidence: 88%

“…Few studies have discussed this relationship for wadi systems (e.g., [17][18][19][20]). Some authors used measured wadi flow data [17,19] that were barely related to spatially homogenous storms, which could have had a deceptive effect on this analysis.…”

mentioning

confidence: 99%

“…Some authors used measured wadi flow data [17,19] that were barely related to spatially homogenous storms, which could have had a deceptive effect on this analysis. Other researchers used empirical equations to estimate hydrological indices, such as peak discharge, using the wadi area, which may not represent the real characteristics of the basin and thus may not yield a reliable relationship with morphometric parameters (e.g., [20]). Although geomorphologic parameters have been used for WFF hazard assessment (e.g., [21][22][23][24]), this assessment was mainly based on morphometric analysis, whereas the hydrologic component was not sufficiently covered.…”

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confidence: 99%

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A Hydrological and Geomorphometric Approach to Understanding the Generation of Wadi Flash Floods

Abdel-Fattah

Saber

Kantoush

et al. 2017

Water

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Abstract:The generation and processes of wadi flash floods are very complex and are not well understood. In this paper, we investigate the relationship between variations in geomorphometric and rainfall characteristics and the responses of wadi flash floods. An integrated approach was developed based on geomorphometric analysis and hydrological modeling. The Wadi Qena, which is located in the Eastern Desert of Egypt, was selected to validate the developed approach and was divided into 14 sub-basins with areas ranging from 315 to 1488 km 2 . The distributed Hydrological River Basin Environment Assessment Model (Hydro-BEAM) was used to obtain a good representation of the spatial variability of the rainfall and geomorphology in the basin. Thirty-eight geomorphometric parameters representing the topographic, scale, shape and drainage characteristics of the basins were considered and extracted using geographic information system (GIS) techniques. A series of flash flood events from 1994, 2010, 2013, and 2014, in addition to synthetic virtual storms with different durations and intensities, were selected for the application of this study. The results exhibit strong correlations between scale and topographic parameters and the hydrological indices of the wadi flash floods, while the shape and drainage network metrics have smaller impacts. The total rainfall amount and duration significantly impact the relationship between the hydrologic response of the wadi and its geomorphometry. For most of the parameters, we found that the impact of the wadi geomorphometry on the hydrologic response increases with increasing rainfall intensity.

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Section: Drainage Network Parameterssupporting

confidence: 88%

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confidence: 99%

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confidence: 99%

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A Hydrological and Geomorphometric Approach to Understanding the Generation of Wadi Flash Floods

Abdel-Fattah

Saber

Kantoush

et al. 2017

Water

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“…Furthermore, the hydrological descriptors of drainage basins (including arid catchments) are positively correlated with morphometric parameters of a watershed, such as: slope, shape, size, drainage density, elevation, basin length, maximum stream length, and total length of stream segments etc. [36]. The hydrological behavior of a drainage basin is largely determined by its geomorphic, geologic, climatic, and morphometric characteristics as defined by linear, areal and relief aspects of the basins [37] [38].…”

Section: Introductionmentioning

confidence: 99%

Morphometric Assessment of Wadi Wala Watershed, Southern Jordan Using ASTER (DEM) and GIS

Farhan¹

2017

JGIS

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Morphometric analysis is of vital concern to understand hydromophological processes in a given watershed, and thus, it is a priority for assessing water resources in drainage basins. A morphometric analysis was conducted to identify the drainage properties of Wadi Wala and the 23 fourth-order subbasins. ASTER DEM data was employed to compile slope, elevation, and aspect maps. Arc GIS software was used to measure and calculate basic, derived and shape morphometric parameters. W. Wala is found to be a sixth-order drainage basin, and the drainage pattern is trellis to sub-trellis in the central and lower part of the catchment, whereas it is dendritic to sub-dendritic pattern in the southern and northern parts. The slopes of the catchment vary from 0˚ -5˚ to >35˚ in slope categories. Tectonic uplifting and tilting, lithology, structure and rejuvenation are the major factors controlling morphological variation over the watershed. The recognized fault systems are chiefly controlling the drainage pattern, and the elongated shape of the sub-basins is attributed to dense lineaments in the central and eastern parts of the watershed. The R b values for the entire catchment and the sub-catchments range from 2 to 7, with a mean of 4.55, which indicates the distortion of drainage pattern by geological structure. Hypsometric integral values are high for the W. Wala watershed and the sub-basins, where it ranges from 70% to 89%. High HI values indicate that drainage basins are at the youth-age stage of geomorphic development, and they are affected by tectonic uplifting, tilting, and the dominance of hillslope process. Variation in HI values is apparent between sub-basins located at the western part, or, the rejuvenated belt where HI values range from 85% to 89%. Whereas the HI values of the sub-basins located at the eastern part of the watershed, vary from 70% to 84%. Regression analysis reveals that R 2 values, which represent the degree of control of driving pa- Y. Farhan respectively (where the F-value is significant at 0.1% and 0.5% levels). Such results imply that the height of local base level (m), and the mean height (m) are the only morphometric driving parameters which have significant control on HI values in the W. Wala watershed. High annual soil loss and sediment load estimated recently, denote that the catchment is highly susceptible to surface erosion at present. Hence, the present study, and the resultant information would help to plan for efficient soil and water conservation measures to reduce soil erosion rates, conserve water, and to control sediment into W. Wala dam.

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“…These geometric characteristics of drainage basins are the fundamental units of the fluvial landscape and a great amount of research has focused on it (Abrahams, 1984). The application of morphometric analysis using remote sensing and GIS techniques for studying floods and flood hazard management have been reported by number of researchers (Ozdemier and Bird, 2009;Subyani et al 2012;Dawood et al 2013). …”

Section: Introductionmentioning

confidence: 99%

Morphometric Analysis of Diyung Watershed in Northeast India using GIS Technique for Flood Management

Kusre

2016

Journal of the Geological Society of India

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The North eastern region is characterized by undulating terrain and high rainfall. Such condition creates a situation of floods in the downstream plain areas of Assam. Difficulties in monitoring the data collection of hydrological events (runoff and sediment yield) in the rugged terrain hinders the planning of suitable control measures. To overcome such constraints alternate measures need to be explored and the study of terrain is one such approach. The study of terrain (morphometry) can help in diagnosing the hydrological behavior of any watershed. In the present study morphometric analysis was done to determine the drainage characteristics of Diyung watershed in Kopili river basin using topographic maps and GIS tools. The morphometric analysis indicates high values of stream density (15464), stream length ratio (1.81); Bifurcation ratio (3.66), RHO coefficient (0.49), Stream frequency (5.26 km -2 ), Drainage density (3.24), indicative of high runoff generation capabilities of the watershed. This high runoff from the watershed is the main reason for floods in the downstream areas. Based on the results, structural and non-structural measures are proposed to mitigate the impacts of flood events.

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إستخدام نماذج الإرتفاعات الرقمية والطرق الإحصائية للمتغيرات المتعددة في تحليل المعاملات المورفومترية لبعض أودية غرب المملكة العربية السعودية

Cited by 34 publications

References 19 publications

A Hydrological and Geomorphometric Approach to Understanding the Generation of Wadi Flash Floods

A Hydrological and Geomorphometric Approach to Understanding the Generation of Wadi Flash Floods

Morphometric Assessment of Wadi Wala Watershed, Southern Jordan Using ASTER (DEM) and GIS

Morphometric Analysis of Diyung Watershed in Northeast India using GIS Technique for Flood Management

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