Modeling watershed erosion with CASC2D

Juliën, Pierre Y.; Rojas, Rosalía; Velleux, Mark

doi:10.1201/9781439833896.ch118

Cited by 2 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yilmaz Kilinc (1972) and Kilinc & Richardson (1973). Rojas (2002) enhanced sediment transport algorithms in CASC2D-SED over Johnson et al (2000) by improving the simulation of transition between supply-limited and capacity-limited transport, allowing transport by advection of suspended material even with negligible capacity and improving sedimentation simulation in backwater areas.…”

Section: Cascade Two-dimensional Sediment Model (Casc2d-sed)mentioning

confidence: 99%

A model for continental-scale water erosion and sediment transport and its application to the Yellow River Basin

Jiang

Parteli

Shao

2022

Preprint

View full text Add to dashboard Cite

<p>A large-scale water erosion and sediment transport model is introduced and applied to predict continental-scale hydrological transport processes at the Yellow River Basin in China. Our model couples the Atmospheric and Hydrological Modelling System (AHMS) with the CASCade 2 Dimensional SEDiment (CASC2D-SED), by considering a scale-adaptive water erosion parameterization and eight possible flow directions of the channel routing model. Here, the AHMS-SED is applied to simulate the water erosion processes in the Yellow River Basin over 10 years with a spatial resolution of 20 km. The simulated daily sediment fluxes from four major hydrological stations along the Yellow River (namely, Tangnaihe, Lanzhou, Toudaoguai and Huayuankou) are compared with corresponding observations. There is a quantitative agreement between these observations and modelling results at all stations. Our results demonstrate the good performance of the new scale-adaptive parameterization and the integrated AHMS-SED, paving the way for the studies of water erosion and sediment transport at large scales. We also show how of our numerical simulations can be used to predict the evolution of sediment transport in the Yellow River Basin under consideration of specific climate change scenarios.</p>

show abstract

Section: Cascade Two-dimensional Sediment Model (Casc2d-sed)mentioning

confidence: 99%

A model for continental-scale water erosion and sediment transport and its application to the Yellow River Basin

Jiang

Parteli

Shao

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…As rain falls on a vegetated surface, part of it is held on the foliage by surface tension forces. This portion of the rainfall evaporates directly (Rojas et al , 2003) and does not take part in the formation of runoff. Accordingly, the interception depth is subtracted from the rainfall before infiltration is calculated.…”

Section: Mathematical Formulationmentioning

confidence: 99%

Geospatially based distributed rainfall‐runoff modelling for simulation of internal and outlet responses in a semi‐forested lower Himalayan watershed

Ramsankaran¹,

Kothyari²,

Ghosh³

et al. 2011

Hydrological Processes

View full text Add to dashboard Cite

Abstract:This study presents a Geographic Information System (GIS)-based distributed rainfall-runoff model for simulating surface flows in small to large watersheds during isolated storm events. The model takes into account the amount of interception storage to be filled using a modified Merriam (1960) approach before estimating infiltration by the Smith and Parlange (1978) method. The mechanics of overland and channel flow are modelled by the kinematic wave approximation of the Saint Venant equations which are then numerically solved by the weighted four-point implicit finite difference method. In this modelling the watershed was discretized into overland planes and channels using the algorithms proposed by Garbrecht and Martz (1999). The model code was first validated by comparing the model output with an analytical solution for a hypothetical plane. Then the model was tested in a medium-sized semi-forested watershed of Pathri Rao located in the Shivalik ranges of the Garhwal Himalayas, India. Initially, a local sensitivity analysis was performed to identify the parameters to which the model outputs like runoff volume, peak flow and time to peak flow are sensitive. Before going for model validation, calibration was performed using the Ordered-Physics-based Parameter Adjustment (OPPA) method. The proposed Physically Based Distributed (PBD) model was then evaluated both at the watershed outlet as well as at the internal gauging station, making this study a first of its kind in Indian watersheds. The results of performance evaluation indicate that the model has simulated the runoff hydrographs reasonably well within the watershed as well as at the watershed outlet with the same set of calibrated parameters. The model also simulates, realistically, the temporal variation of the spatial distribution of runoff over the watershed and the same has been illustrated graphically.

show abstract

Modeling watershed erosion with CASC2D

Cited by 2 publications

References 5 publications

A model for continental-scale water erosion and sediment transport and its application to the Yellow River Basin

A model for continental-scale water erosion and sediment transport and its application to the Yellow River Basin

Geospatially based distributed rainfall‐runoff modelling for simulation of internal and outlet responses in a semi‐forested lower Himalayan watershed

Contact Info

Product

Resources

About