Surface runoff as influenced by slope position and land use in the Koupendri catchment of northwest Benin: field observation and model validation

Azuka, Chukwuebuka Vincent; Igué, A. M.

doi:10.1080/02626667.2020.1729360

Cited by 8 publications

(3 citation statements)

References 51 publications

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“…For example, apart from the soil texture classes, there is a significant effect on estimates of soil hydraulic properties, when both OM and BD variables and when only one of them are inputs to the equations (PTFs) [54]. Consequently, the impact of land use and geographic attributes on soil BD and OM [55] leads to a different description of the same soil in the PTFs (i.e., different input values into the equation) and this may account for the observed variation in soil hydraulic properties [11,43]. As a result, the spatial distribution of the differences that we observed between AWC and K sat simulated by the scenarios and those of the baseline scenario could be attributed to the land use distribution as well as the proximity to watercourses (Figures 1 and 3).…”

Section: Discussionmentioning

confidence: 99%

A Comparative Investigation of Various Pedotransfer Functions and Their Impact on Hydrological Simulations

Mohajerani

Teschemacher

Casper

2021

Water

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Soil hydraulic properties, which are basically saturated and unsaturated hydraulic conductivity and water retention characteristics, remarkably control the main hydrological processes in catchments. Thus, adequate parameterization of soils is one of the most important tasks in physically based catchment modeling. To estimate these properties, the choice of the PTFs in a hydrological model is often made without taking the runoff characteristics of the catchment into consideration. Therefore, this study introduces a methodology to analyze the sensitivity of a catchment water balance model to the choice of the PTF. To do so, we define 11 scenarios including different combinations of PTFs to estimate the van Genuchten parameters and saturated hydraulic conductivity. We use a calibrated/validated hydrological model (WaSiM-ETH) as a baseline scenario. By altering the underlying PTFs, the effects on the hydraulic properties are quantified. Moreover, we analyze the resulting changes in the spatial/temporal variation of the total runoff and in particular, the runoff components at the catchment outlet. Results reveal that the water distribution in the hydrologic system varies considerably amongst different PTFs, and the water balance components are highly sensitive to the spatial structure of soil hydraulic properties. It is recommended that models be tested by careful consideration of PTFs and orienting the soil parameterization more towards representing a plausible hydrological behavior rather than focusing on matching the calibration data.

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Section: Discussionmentioning

confidence: 99%

A Comparative Investigation of Various Pedotransfer Functions and Their Impact on Hydrological Simulations

Mohajerani

Teschemacher

Casper

2021

Water

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“…This is supported by Qur'ani et al ( 2022) that forest with slopes of 0-8% produce greater infiltration rate values than those with slopes of 8%-23%. In addition, Azuka and Igué (2020) and Jourgholami et al (2020) reported that the density and planting layout in forest areas can influence the length of surface flow paths. As reported by Virlayani et al (2021) the speed of surface water runoff in sub-watershed forest areas of Malang District is 56.33 mm/second in the area without vegetation, 54.00 mm/second in the straight planting system, and 52.83 mm/second in the zig-zag planting system.…”

Section: Discussionmentioning

confidence: 99%

“…The low surface runoff in November 2022 is caused by the condition of the soil which is still relatively dry, because the rainy season has just begun that month. Dry soil conditions have pores that are still filled with a lot of air and the soil is still not saturated, so water can quickly be absorbed into the soil (Azuka and Igué 2020;Jourgholami et al 2020). This result is in line with the research by Kabelka et al (2019) in hop garden Solopysky Village, Czech Republic and Parhizkar et al (2021) in Saravan Forest Park, Guilan province, Iran that wet or dry soil conditions during rain greatly influence the amount of surface runoff, where in dry soil conditions many soil macro pores are filled with air which allows a lot of rainwater infiltrates.…”

Section: Discussionmentioning

confidence: 99%

Surface runoff in varying forest cover types in Jangkok Watershed, Lombok Island, Indonesia

MARKUM,

RAHMAN

2024

Biodiversitas

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Abstract. Markum, Rahman FA. 2024. Surface runoff in varying forest cover types in Jangkok Watershed, Lombok Island, Indonesia. Biodiversitas 25: 753-761. Forests in the Jangkok Watershed play an important role in controlling ecological functions and hydrological cycles in Lombok Island, West Nusa Tenggara, Indonesia. This research aims to evaluate the amount of surface runoff in the Jangkok Watershed by looking at various types of forest cover, namely Primary Forest (PF), Disturbed Forest (DF), Candlenut Agroforestry (CA), Mahogany Woodlot (MW), Multistrata Agroforestry (MA) and Simple Agroforestry (SA). The research area was located at altitudes between 250-650 meters above sea level with a slope of 7-43%. Data collected on each type of forest cover included: vegetation characteristics, surface runoff, slope and rainfall. The result shows vegetation cover in the studied area varies from moderate to very dense with coverage ranging from 50-90%. The vegetation in PF, DF and MA are characterized by very diverse vegetation, while that in UM, CA and SA it is quite homogeneous. The amount of Surface runoff coefficient varies across forest cover types with PF being the lowest (0.6-1.4%), followed by DF (0.6-1.7%), MA (0.6-1.7%), MW (0.6-2.1%), SA (1.0-2.2%) and CA (1.8-4.3%). Factors that are considered influential in determining the magnitude of surface runoff at the research location are the physical properties of the soil, rainfall intensity, vegetation type, structure and density, and land slope. The findings of this study suggest that more complex vegetation has important role in minimizing surface runoff, highlighting the importance of preserving and protecting this forest type to maintain hydrological function of watershed.

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Study of experimental and numerical simulation on the influence of gravel on the interflow of slope land

wang,

Bai,

Huang

2024

Environ Sci Pollut Res

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Surface runoff as influenced by slope position and land use in the Koupendri catchment of northwest Benin: field observation and model validation

Cited by 8 publications

References 51 publications

A Comparative Investigation of Various Pedotransfer Functions and Their Impact on Hydrological Simulations

A Comparative Investigation of Various Pedotransfer Functions and Their Impact on Hydrological Simulations

Surface runoff in varying forest cover types in Jangkok Watershed, Lombok Island, Indonesia

Study of experimental and numerical simulation on the influence of gravel on the interflow of slope land

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