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Catchment hillslopes in nature have a complex geometry. Complex hillslopes have different plans (convergent, parallel and divergent) and different curvature (straight, concave and convex). In this study, the erosion rates of the nine complex hillslopes were investigated using the universal soil loss (USLE) method. The topography factor (LS function) in the USLE was developed as a function of plan shape and profile curvature. The hillslopes studied were divided into sets of complex pixels and the erosion over the pixels was calculated. Total erosion was regarded as the sum of erosion of all pixels. Furthermore, to calculate the sediment delivery ratio of each pixel, a new travel time equation for complex hillslopes was employed. Results showed that the mean erosion of convex hillslopes was 1.43 times that of concave and 1.19 times that of straight slopes. The effect of curvature shape on erosion was much greater than plan shape effect. The highest erosion belonged to convex divergent slopes, and the least erosion was related to concave divergent slopes. The laboratory results intended for validation of the numerical model also show that in hillslopes with fixed plan, the erosion rate in the convex hillslopes exceeds that of concave and straight hillslopes. Also, in the hillslopes with fixed curvature profile, the erosion rate in the convergent hillslopes is more than in the divergent and parallel ones.
Słowa kluczowe
Wydawca
Czasopismo
Rocznik
Tom
Strony
1587--1597
Opis fizyczny
Bibliogr. 38 poz.
Twórcy
autor
- Department of Civil Engineering, Estahban Branch, Islamic Azad University, Estahban, Iran
autor
- Faculty of Natural Resources, Yazd University, Yazd, Iran
- Present Address: Geography Department, The University of British Columbia, Vancouver, Canada
Bibliografia
- 1. Aryal SK, O’Loughlin EM, Mein RG (2005) A similarity approach to determine response times to steady-state saturation in landscapes. Adv Water Resour 28:99–115
- 2. Baiamonte G, Singh VP (2015) Overland flow times of concentration for hillslopes of complex topography. J Irrig Drain Eng 142(3):04015059
- 3. Benavidez R, Jackson B, Maxwell D, Norton K (2018) A review of the (revised) universal soil loss equation ((R) USLE): with a view to increasing its global applicability and improving soil loss estimates. Hydrol Earth Syst Sci 22(11):6059–6086
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- 6. Desmet PJJ, Govers G (1996) A GIS procedure for automatically calculating the USLE LS factor on topographically complex landscape units. J Soil Water Conserv 51(5):427–433
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- 9. Ferro V (1997) Further remarks on a distributed approach to sediment delivery. Hydrol Sci J 42(5):633–647
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- 13. Lu W, Li S, Li F, Lei T (2016) Laboratory study on soil erosion of loess convex and concave slopes with application of polyacrylamide. Trans Chin Soc Agric Eng 32(10):122–128
- 14. Mombeini A (2017) Laboratory investigation of effect of the manning roughness coefficient on erosion along complex hillslopes. MSc thesis, Yazd University
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- 16. Noroozpour S, Saghafian B, Akhondali AM, Radmanesh F (2014) Travel time of curved parallel hillslopes. Hydrol Res 45(2):190–199
- 17. Ostovari Y, Ghorbani-Dashtaki S, Bahrami HA, Naderi M, Dematte JAM, Kerry R (2016) Modification of the USLE K factor for soil erodibility assessment on calcareous soils in Iran. Geomorphology 273:385–395
- 18. Panagos P, Borrelli P, Meusburger K (2015) A new European slope length and steepness factor (LS-factor) for modeling soil erosion by water. Geosciences 5(2):117–126
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- 22. Sabzevari T (2010) Development of catchments geomorphological instantaneous unit hydrograph based on surface and subsurface flow response of complex hillslopes. PhD thesis, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
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Uwagi
Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).
Typ dokumentu
Bibliografia
Identyfikator YADDA
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