Model:River Erosion Model

River Erosion Model

Also known as	REM
Model type	Single
Model part of larger framework
Note on status model
Date note status model

Incorporated models or components:

Spatial dimensions	1D
Spatial extent	Watershed-Scale
Model domain	Terrestrial, Hydrology
One-line model description	An intermediate complexity model for simulating stream channel evolution (years to decades) at the watershed scale.
Extended model description	REM mechanistically simulates channel bed aggradation/degradation and channel widening in river networks. It has successfully been applied to alluvial river systems to simulate channel change over annual and decadal time scales. REM is also capable of running Monte Carlo simulations (in parallel to reduce computational time) to quantify uncertainty in model predictions.

Keywords:	,

Supported platforms	Windows
Other platform	Has not been tested on non-Windows platforms
Programming language	C++
Other program language
Code optimized	Single Processor, Multiple Processors
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development	2017
Does model development still take place?	Yes
If above answer is no, provide end year model development
Code development status	Only maintenance
When did you indicate the 'code development status'?	2020
Model availability	As code
Source code availability (Or provide future intension)	Through web repository
Source web address	https://github.com/rodlammers/REM
Source csdms web address
Program license type	Other
Program license type other	MIT
Memory requirements
Typical run time	5-10 minutes for single run; hours for Monte Carlo runs

Describe input parameters	Channel geometry (e.g. bank height/angle, width, longitudinal profile); bed grain size distribution; discharge time series; sediment input time series; bank soil parameters (critical shear stress and cohesion)
Input format	ASCII
Other input format
Describe output parameters	Channel geometry; sediment export
Output format	ASCII
Other output format
Pre-processing software needed?	No
Describe pre-processing software
Post-processing software needed?	No
Describe post-processing software
Visualization software needed?	Yes
If above answer is yes
Other visualization software	R package REMvisualizer

Describe processes represented by the model	Sediment transport, channel bed aggradation/degradation, fluvial bank erosion (excess shear stress) and bank failure (mass wasting). See Lammers and Bledsoe (2018) and Lammers and Bledsoe (2019) for more information: https://www.sciencedirect.com/science/article/pii/S0022169418307303 https://www.sciencedirect.com/science/article/pii/S0301479718314968
Describe key physical parameters and equations
Describe length scale and resolution constraints
Describe time scale and resolution constraints
Describe any numerical limitations and issues

Describe available calibration data sets
Upload calibration data sets if available:
Describe available test data sets	Modeling testing performed on data from the lower Colorado River and North Fork Toutle River. Model input data available here: https://github.com/rodlammers/REM
Upload test data sets if available:
Describe ideal data for testing	Long term (at least 10 years) of data on stream channel evolution. This would include changes in both channel width and bed elevation throughout a small channel network. Also have a continuous time series of discharge and physical characteristics of the stream channels (bed grain size distribution, bank soil erodibility, etc.).

Do you have current or future plans for collaborating with other researchers?

Is there a manual available?	Yes
Upload manual if available:
Model website if any	https://github.com/rodlammers/REM
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Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
Lammers, Roderick W.; Bledsoe, Brian P.; 2019. Quantifying pollutant loading from channel sources: Watershed-scale application of the River Erosion Model. Journal of Environmental Management, 234104–114. 10.1016/j.jenvman.2018.12.074	closed	2019	a module application description	9
Lammers, Roderick W.; Bledsoe, Brian P.; 2018. A network scale, intermediate complexity model for simulating channel evolution over years to decades. Journal of Hydrology, 566886–900. 10.1016/j.jhydrol.2018.09.036	closed	2018	a module overview describing a module	16