Applicability of the landscape evolution model in the absence of rills
Despite numerous applications of physically-based models for incised landscapes, their applicability for overland flow on unchanneled surfaces is not known. This work challenges a widely used landscape evolution model for the case of non-uniform rainfall and absence of rills using laboratory flume e...
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| Format: | Article |
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Frontiers Media S.A.
2022-07-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.872711/full |
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| author | Mohsen Cheraghi Andrea Rinaldo Andrea Rinaldo Graham C. Sander Paolo Perona Paolo Perona Andrea Cimatoribus Seifeddine Jomaa D. A. Barry |
| author_facet | Mohsen Cheraghi Andrea Rinaldo Andrea Rinaldo Graham C. Sander Paolo Perona Paolo Perona Andrea Cimatoribus Seifeddine Jomaa D. A. Barry |
| author_sort | Mohsen Cheraghi |
| collection | DOAJ |
| description | Despite numerous applications of physically-based models for incised landscapes, their applicability for overland flow on unchanneled surfaces is not known. This work challenges a widely used landscape evolution model for the case of non-uniform rainfall and absence of rills using laboratory flume experiment. Rainfall with an average intensity of 85 mm h−1 was applied for 16 h during which high resolution laser scans of the morphology were captured. The overland flow was modeled as a network that preserves the water flux for each cell in the discretized domain. This network represented the gravity-driven surface flow and determined the evolution direction. The model was calibrated using the first 8 h of the experiment and was then used to predict the second 8 h. The calibrated model predicted, as expected, a smoother surface morphology (and less detailed overland flow network) than that measured. This difference resulted from quenched randomness (e.g., small pebbles) within the experimental soil that emerged during erosion and that were captured by the laser scans. To investigate the quality of the prediction, a low-pass filter was applied to remove the small-scale variability of the surface morphology. This step confirmed that the model simulations captured the main characteristics of the measured morphology. The experimental results were found to satisfy a scaling relation for the exceedance probability of discharge even in absence of rills. However, the model did not reproduce the experimental scaling relation as the detailed surface micro-roughness was not accounted for by the model. A lower cutoff on the scale of applicability of the general landscape evolution equation is thus suggested, complementing other work on the upper cutoff underpinned by runoff-producing areas. |
| first_indexed | 2024-04-13T20:56:31Z |
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| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-13T20:56:31Z |
| publishDate | 2022-07-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-a1479cd3cdc745e98c628ebb5525ec3d2022-12-22T02:30:19ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-07-011010.3389/feart.2022.872711872711Applicability of the landscape evolution model in the absence of rillsMohsen Cheraghi0Andrea Rinaldo1Andrea Rinaldo2Graham C. Sander3Paolo Perona4Paolo Perona5Andrea Cimatoribus6Seifeddine Jomaa7D. A. Barry8Ecological Engineering Laboratory (ECOL), Institute of Environmental Engineering (IIE), School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandEcohydrology Laboratory (ECHO), Institute of Environmental Engineering (IIE), School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandDipartimento di Ingegneria Civile Edile e Ambientale, Universitá di Padova, Padua, ItalySchool of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, United KingdomHydraulic Platform-LCH, Civil Engineering Institute (IIC), School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandSchool of Engineering, Institute for Infrastructure and Environment, The University of Edinburgh, Edinburgh, United KingdomEcological Engineering Laboratory (ECOL), Institute of Environmental Engineering (IIE), School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandDepartment of Aquatic Ecosystem Analysis and Management, Helmholtz Centre for Environmental Research—UFZ, Magdeburg, GermanyEcological Engineering Laboratory (ECOL), Institute of Environmental Engineering (IIE), School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, SwitzerlandDespite numerous applications of physically-based models for incised landscapes, their applicability for overland flow on unchanneled surfaces is not known. This work challenges a widely used landscape evolution model for the case of non-uniform rainfall and absence of rills using laboratory flume experiment. Rainfall with an average intensity of 85 mm h−1 was applied for 16 h during which high resolution laser scans of the morphology were captured. The overland flow was modeled as a network that preserves the water flux for each cell in the discretized domain. This network represented the gravity-driven surface flow and determined the evolution direction. The model was calibrated using the first 8 h of the experiment and was then used to predict the second 8 h. The calibrated model predicted, as expected, a smoother surface morphology (and less detailed overland flow network) than that measured. This difference resulted from quenched randomness (e.g., small pebbles) within the experimental soil that emerged during erosion and that were captured by the laser scans. To investigate the quality of the prediction, a low-pass filter was applied to remove the small-scale variability of the surface morphology. This step confirmed that the model simulations captured the main characteristics of the measured morphology. The experimental results were found to satisfy a scaling relation for the exceedance probability of discharge even in absence of rills. However, the model did not reproduce the experimental scaling relation as the detailed surface micro-roughness was not accounted for by the model. A lower cutoff on the scale of applicability of the general landscape evolution equation is thus suggested, complementing other work on the upper cutoff underpinned by runoff-producing areas.https://www.frontiersin.org/articles/10.3389/feart.2022.872711/fulllandscape evolution modelflume experimentabsence of rillsnon-uniform rainfallhigh resolution morphologyspectral analysis |
| spellingShingle | Mohsen Cheraghi Andrea Rinaldo Andrea Rinaldo Graham C. Sander Paolo Perona Paolo Perona Andrea Cimatoribus Seifeddine Jomaa D. A. Barry Applicability of the landscape evolution model in the absence of rills Frontiers in Earth Science landscape evolution model flume experiment absence of rills non-uniform rainfall high resolution morphology spectral analysis |
| title | Applicability of the landscape evolution model in the absence of rills |
| title_full | Applicability of the landscape evolution model in the absence of rills |
| title_fullStr | Applicability of the landscape evolution model in the absence of rills |
| title_full_unstemmed | Applicability of the landscape evolution model in the absence of rills |
| title_short | Applicability of the landscape evolution model in the absence of rills |
| title_sort | applicability of the landscape evolution model in the absence of rills |
| topic | landscape evolution model flume experiment absence of rills non-uniform rainfall high resolution morphology spectral analysis |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.872711/full |
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