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Nosratollah Amanian
Department of Civil Engineering, Faculty of Engineering, Yazd University, Yazd, Iran

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Journal article
Published: 12 June 2021 in CATENA
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Factors involved in hillslope geometry and soil erosion are still under discussion by the scientific community- and one of these factors is microtopography. In this research, the effect of surface roughness (SR) on the soil loss was investigated for different complex hillslope (CHS) systems in terms of plan shapes (convergent, parallel, and divergent) and profile curvatures (convex, concave, and straight), considering representative surface conditions of the arid steep slope region of Tahoneh Watershed, located close to the city of Yazd, Iran. The current research was conducted under laboratory conditions on three different soil types with an SR of 0.015, 0.016, and 0.018 and using a rainfall simulator under a rainfall intensity of 26 ± 3 mm/h with a duration of 15 min. The results showed that the soil loss, as well as the sediment’s arrival time into the outlet of each complex hillslope, varied with SR changes. S, oil loss decreased in each CHS, and the sediment’s arrival time into the outlet was delayed with increased SR in the soil types. A significant difference (F = 51.648, P ≤ 0.001) was obtained in the interaction between the SR and CHSs on the soil loss, as well as the sediment’s arrival time into the outlet. The results of this study using these specific soils indicate that the highest soil loss reduction due to the SR can be observed in straight parallel hillslopes. We conclude that our results can give new key insights about complex geomorphological processes related to sediment mobilization at the pedon scale in arid watersheds to mitigate the negative impacts of human activities on non-straight parallel hillslopes.

ACS Style

Ava Mombini; Nosratollah Amanian; Ali Talebi; Mahboobeh Kiani-Harchegani; Jesús Rodrigo-Comino. Surface roughness effects on soil loss rate in complex hillslopes under laboratory conditions. CATENA 2021, 206, 105503 .

AMA Style

Ava Mombini, Nosratollah Amanian, Ali Talebi, Mahboobeh Kiani-Harchegani, Jesús Rodrigo-Comino. Surface roughness effects on soil loss rate in complex hillslopes under laboratory conditions. CATENA. 2021; 206 ():105503.

Chicago/Turabian Style

Ava Mombini; Nosratollah Amanian; Ali Talebi; Mahboobeh Kiani-Harchegani; Jesús Rodrigo-Comino. 2021. "Surface roughness effects on soil loss rate in complex hillslopes under laboratory conditions." CATENA 206, no. : 105503.

Journal article
Published: 03 December 2019 in Water
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The geometry of hillslopes (plan and profile) affects soil erosion under rainfall-runoff processes. This issue comprises of several factors, which must be identified and assessed if efficient control measures are to be designed. The main aim of the current research was to investigate the impact of surface Roughness Coefficients (RCs) and Complex Hillslopes (CHs) on runoff variables viz. time of generation, time of concentration, and peak discharge value. A total of 81 experiments were conducted with a rainfall intensity of 7 L min−1 on three types of soils with different RCs (i.e., low = 0.015, medium = 0.016, and high = 0.018) and CHs (i.e., profile curvature and plan shape). An inclination of 20% was used for three replications. The results indicate a significant difference (p-value ≤ 0.001) in the above-mentioned runoff variables under different RCs and CHs. Our investigation of the combined effects of RCs and CHs on the runoff variables shows that the plan and profile impacts are consistent with a variation in RC. This can implicate that at low RC, the effect of the plan shape (i.e., convergent) on runoff variables increases but at high RC, the impact of the profile curvature overcomes the plan shapes and the profile curvature’s changes become the criteria for changing the behavior of the runoff variables. The lowest mean values of runoff generation and time of concentration were obtained in the convex-convergent and the convex-divergent at 1.15 min and 2.68 min, respectively, for the soil with an RC of 0.015. The highest mean of peak discharge was obtained in the concave-divergent CH in the soil with an RC of 0.018. We conclude that these results can be useful in order to design planned soil erosion control measures where the soil roughness and slope morphology play a key role in activating runoff generation.

ACS Style

Masoud Meshkat; Nosratollah Amanian; Ali Talebi; Mahboobeh Kiani-Harchegani; Jesús Rodrigo-Comino. Effects of Roughness Coefficients and Complex Hillslope Morphology on Runoff Variables under Laboratory Conditions. Water 2019, 11, 2550 .

AMA Style

Masoud Meshkat, Nosratollah Amanian, Ali Talebi, Mahboobeh Kiani-Harchegani, Jesús Rodrigo-Comino. Effects of Roughness Coefficients and Complex Hillslope Morphology on Runoff Variables under Laboratory Conditions. Water. 2019; 11 (12):2550.

Chicago/Turabian Style

Masoud Meshkat; Nosratollah Amanian; Ali Talebi; Mahboobeh Kiani-Harchegani; Jesús Rodrigo-Comino. 2019. "Effects of Roughness Coefficients and Complex Hillslope Morphology on Runoff Variables under Laboratory Conditions." Water 11, no. 12: 2550.