Watershed Environmental Hydrology (WEHY) Model Based on Upscaled Conservation Equations: Hydrologic Module

Kavvas, M. L.; Chen, Z. Q.; Dogrul, C.; Yoon, Jaeyoung; Ohara, N.; Liang, L.; Aksoy, Hafzullah; Anderson, Michael L.; Yoshitani, Junichi; Fukami, Kimio; Matsuura, Takeshi

doi:10.1061/(asce)1084-0699(2004)9:6(450)

Cited by 94 publications

(65 citation statements)

References 27 publications

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“…Aksoy & Kavvas (2005) cite some physically-based models (EUROSEM and WEPP, for example), which overcome this limitation and are able to simulate sediment fluxes on an event basis. Nonetheless, the substantial amount of input data for such models makes their applicability to large watersheds impractical, unless the governing equations are upscaled, as in WEHY model (Kavvas et al, 2004(Kavvas et al, , 2006. As a consequence, watershed-scale estimations of sediment yield in a spatially-distributed manner have been carried out with semi-distributed models such as SWAT (Chen & Mackay, 2004), or pixelbased models such as WATEM/SEDEM (Verstraeten et al, 2007;de Vente et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Modelling spatio-temporal patterns of sediment yield and connectivity in a semi-arid catchment with the WASA-SED model

Medeiros

Güntner

Francke

et al. 2010

Hydrological Sciences Journal

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Rainfall-runoff induced soil erosion causes important environmental degradation by reducing soil fertility and impacting on water availability as a consequence of sediment deposition in surface reservoirs used for water supply, particularly in semi-arid areas. However, erosion models developed on experimental plots cannot be directly applied to estimate sediment yield at the catchment scale, since sediment redistribution is also controlled by the transport conditions along the landscape. In particular, representation of landscape connectivity relating to sediment transfer from upslope areas to the river network is required. In this study, the WASA-SED model is used to assess the spatial and temporal patterns of water and sediment connectivity for a semi-arid meso-scale catchment (933 km 2 ) in Brazil. It is shown how spatial and temporal patterns of sediment connectivity within the catchment change as a function of landscape and event characteristics. This explains the nonlinear catchment response in terms of sediment yield at the outlet.Key words sediment yield; watershed connectivity; catchment scale; semi-arid; WASA-SED model Modélisation des patrons spatio-temporels de la connectivité et de la production de sédiments dans un bassin versant semi-aride à l'aide du modèle WASA-SED Résumé L'érosion des sols induite par le ruissellement cause d'importantes dégradations de l'environnement en réduisant la fertilité des sols et en ayant un impact sur la disponibilité de l'eau suite au dépôt de sédiments dans les réservoirs, particulièrement dans les régions semi-arides. Cependant, des modèles d'érosion développés pour des parcelles expérimentales ne peuvent pas être appliqués à l'évaluation de la production de sédiments à l'échelle des bassins hydrographiques, parce que la redistribution des sédiments est aussi contrôlée par les conditions de transport dans le paysage. En particulier il est nécessaire de représenter la connectivité du paysage en relation avec le transfert des sédiments des versants vers le réseau hydrographique. Dans cette étude, on utilise le modèle WASA-SED pour évaluer les patrons spatio-temporels de la connectivité de l'eau et des sédiments dans un bassin versant semi-aride de méso-échelle (933 km 2 ) au Brésil. Les résultats montrent comment les patrons spatio-temporels de la connectivité des sédiments dans le bassin versant changent en fonction des caractéristiques du paysage et des événements. Ceci explique la réponse non-linéaire du bassin versant en termes de production de sédiments à l'exutoire.Mots clefs production des sédiments; connectivité; échelle du basin versant; semi-aride; modèle WASA-SED

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Section: Introductionmentioning

confidence: 99%

Modelling spatio-temporal patterns of sediment yield and connectivity in a semi-arid catchment with the WASA-SED model

Medeiros

Güntner

Francke

et al. 2010

Hydrological Sciences Journal

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“…Similarly, analytical studies have shown that the functional form of point-and hillslope-scale infiltration equations are different (Maller and Sharma, 1981;Chen et al, 1994;Govindaraju et al, 2006). Kavvas et al (2004) consider these issues in formulating the WHEY model.…”

Section: P R Furey Et Al: a Top-down Model To Generate Ensembles Omentioning

confidence: 99%

“…The approaches taken to develop such models have led to two types of models: bottom-up (upward) and top-down (downward). Bottom-up models originate from observations at a point or plot scale (Kavvas et al, 2004;Govindaraju et al, 2006), while top-down models originate from observations at the basin scale (Klemes, 1983;Sivapalan et al, 2003). Most approaches taken to model runoff generation as a space-time variable phenomenon within a basin have been bottom-up.…”

Section: Introductionmentioning

confidence: 99%

A top-down model to generate ensembles of runoff from a large number of hillslopes

Furey

Gupta

Troutman

2013

Nonlin. Processes Geophys.

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Abstract. We hypothesize that total hillslope water loss for a rainfall-runoff event is inversely related to a function of a lognormal random variable, based on basin-and pointscale observations taken from the 21 km 2 Goodwin Creek Experimental Watershed (GCEW) in Mississippi, USA. A top-down approach is used to develop a new runoff generation model both to test our physical-statistical hypothesis and to provide a method of generating ensembles of runoff from a large number of hillslopes in a basin. The model is based on the assumption that the probability distributions of a runoff/loss ratio have a space-time rescaling property. We test this assumption using streamflow and rainfall data from GCEW. For over 100 rainfall-runoff events, we find that the spatial probability distributions of a runoff/loss ratio can be rescaled to a new distribution that is common to all events. We interpret random within-event differences in runoff/loss ratios in the model to arise from soil moisture spatial variability. Observations of water loss during events in GCEW support this interpretation. Our model preserves water balance in a mean statistical sense and supports our hypothesis.As an example, we use the model to generate ensembles of runoff at a large number of hillslopes for a rainfall-runoff event in GCEW.

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“…Only recently, KAVVAS et al (2004) developed a two-dimensional physically-based rainfallrunoff model coupled later on to an environmental module accommodating the erosion and sediment transport processes considering the random behaviour of the watershed as well as rill formation on the soil surface (KAVVAS et al, 2006). Clearly this type of analysis is not an easy task.…”

Section: Modelling Of Sediment Transportmentioning

confidence: 99%

Relationships among man, environment and sediment transport

Mahé

Aksoy

Brou

et al. 2013

rseau

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In the Mediterranean the environment is under pressure from agricultural and urban development, changes in agricultural practices and international markets, and climate change. Moreover, many studies show a steady increase in the agro-pastoral pressure and land degradation and their impacts on water resources and soil, and ultimately the lives of local people. But few studies address these issues across the inclusive scale of large river basins. The conference held at Tipaza in Algeria, from which come several papers published in the Journal of Water Science in 2013, was intended to reflect on the topics, methods and tools available to study the relationships among humans, the environment and sediment transport at this large scale, with the result expected to improve the potential for dialogue between researchers and developers who make decisions for regional macro surfaces. The topics discussed at the conference that appear in the articles published here concern the factors responsible for the variability of sediment transport: climate change and anthropogenic changes, such as agricultural activity and water projects; relationships between land-cover/land-use, rainfall-runoff processes and sediment transport; modeling of sediment transport; and the interest of a multi-scale approach, predominantly a spatial one, for addressing the geographical realities of large basins and scale transfer issues, particularly in Mediterranean and semi-arid areas.

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Watershed Environmental Hydrology (WEHY) Model Based on Upscaled Conservation Equations: Hydrologic Module

Cited by 94 publications

References 27 publications

Modelling spatio-temporal patterns of sediment yield and connectivity in a semi-arid catchment with the WASA-SED model

Modelling spatio-temporal patterns of sediment yield and connectivity in a semi-arid catchment with the WASA-SED model

A top-down model to generate ensembles of runoff from a large number of hillslopes

Relationships among man, environment and sediment transport

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