Rangeland hydrology
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2018 SWCS International Annual Conference July 29-August 1, 2018 Albuquerque Convention Center
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Rangeland hydrology
- 1. RHEM - 2018 Rangeland Hydrology and Erosion Model Mark Nearing Southwest Watershed Research Center USDA-Agricultural Research Service Tucson, AZ, USA Presented by:
- 2. Great Basin Rangelands Research, USDA-ARS Reno, Nevada Northwest Watershed Research Center, USDA-ARS Boise, Idaho RHEM Research Group Mark Nearing C. Jason Williams Mariano Hernandez Gerardo Armendariz Mark Weltz Sayjro (Kossi) Nouwakpo Fred Pierson Central National Technology Support Center, USDA-NRCS Dallas, Texas Ken Spaeth George Peacock (retired) Southwest Watershed Research Center, USDA-ARS Tucson, Arizona Olaf David Texas A&M Kingsville, Texas Osama Al-Hamdan Colorado State Univ. Ft. Collins, CO
- 3. Rangeland Hydrology and Erosion Model. RHEM is a dynamic, event-based hillslope-scale infiltration , runoff and erosion model designed specifically for rangelands. What is RHEM?
- 4. โRangelands are grasslands, shrublands, woodlands, wetlands, and deserts that are grazed by domestic livestock or wild animals.โ (Wikipedia) Rangelands are a sub-set of grazinglands, but generally refer to lands not suitable for agricultural crops. They do not include pastures that are managed using agronomic practices, such as usually found in humid cropland areas. What are rangelands?
- 5. What does RHEM do? โข RHEM estimates runoff, erosion, and sediment delivery rates at the spatial scale of the hillslope. โข RHEM is designed so to be used as a runoff and erosion calculator, or "engine", within a web-based interface and within other process-based models that apply to the watershed scale, such as AGWA/KINEROS2. โข From the research perspective RHEM is a vehicle for incorporating new science from rangeland infiltration, runoff, and erosion research.
- 6. RHEM Structure & Function Fortran Core Engine Parameter Estimation User Interfaces Applications
- 7. Experimental data ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Ely Moab Duke Nunn Cuba Rifle Price Akron Wahoo Ferron Tooele Mandan Sonora Sidney Eureka Rangely Lincoln Mercury Buffalo Degater Montrose Eastgate Streeter Prescott Killdeer Woodward Amarillo Tombstone Newcastle Los Banos Blackfoot Chickasha Castlehead Farmington Hanksville Los Alamos Susanville Cedar City Cottonwood Sheep Creek Saval Ranch Reynolds CreekSteens Mountain San Luis Obispo Nevada Testsite Grand Junction Study Locations ! RHEM Development Sites from WEPP-IRWET ! Historic Rainfall Simulations ! Funded/ Proposed Rainfall Simulations Rainfall Simulation Experimental Sites RHEM was first developed based on the WEPP-IRWET dataset 204 plots, 49 sites, 15 western states. Database is expanded now with new data from Boise, Reno, Tucson
- 8. Equations Hernandez, Nearing, et al., 2017 WRR
- 9. User Interfaces ๏ต Web-based Interface ๏ต Stand-alone executable ๏ต KINEROS & AGWA watershed/geospatial models (USDA-ARS)
- 10. RHEM web-based interface The RHEM web tool is an online interface that allows users to input site information and review simulation results. http://apps.tucson.ars.ag.gov/rhem/
- 11. Uses information that rangeland specialists understand Climate Station Soil Texture Class Slope Steepness % Shape Class Foliar Cover Bunch Grass % Shrub/Tree % Annual/Forbs % Sod Grass % Ground Cover Litter % Rocks % Basal % Bio-Crusts % 9 numbers & 3 dropdown choices
- 12. Output โ Scenario comparisons
- 13. Applications How REHM is being used ๏ต Informing Ecological Site Descriptions (ESDs) S-T ๏ต Land Resource Inventory and Assessment (NRI) ๏ต Hillslope-scale engine within watershed models ๏ต USDA-NRCS Field Offices ๏ต Research, teaching, and other applications with the web-based interface ๏ต Assessment of conservation practices (CEAP)
- 14. Future Directions ๏ต USDA Handbook and user guide ๏ต Chapter in the ESD development handbook ๏ต Training Course in rangeland hydrology ๏ต Grid-based climate input ๏ต International climate data ๏ต Disturbance (fire) ๏ต Saline soils ๏ต Risk and Soil Loss Tolerance for rangeland
- 15. http://apps.tucson.ars.ag.gov/rhem/ or go to the USDA ARS Southwest Watershed Research Center home page and follow the link to โModel Accessโ