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Modelling Runoff and Sediment Loads in a Developing Coastal Watershed of the US-Mexico Border
- Source :
- Water 11(5), 1024 (2019), Helvia. Repositorio Institucional de la Universidad de Córdoba, instname, Water, Water, Vol 11, Iss 5, p 1024 (2019), Volume 11, Issue 5
- Publication Year :
- 2019
- Publisher :
- MDPI, 2019.
-
Abstract
- Urbanization can increase sheet, rill, gully, and channel erosion. We quantified the sediment budget of the Los Laureles Canyon watershed (LLCW), which is a mixed rural-urbanizing catchment in Northwestern Mexico, using the AnnAGNPS model and field measurements of channel geometry. The model was calibrated with five years of observed runoff and sediment loads and used to evaluate sediment reduction under a mitigation scenario involving paving roads in hotspots of erosion. Calibrated runoff and sediment load had a mean-percent-bias of 28.4 and &minus<br />8.1, and root-mean-square errors of 85% and 41% of the mean, respectively. Suspended sediment concentration (SSC) collected at different locations during one storm-event correlated with modeled SSC at those locations, which suggests that the model represented spatial variation in sediment production. Simulated gully erosion represents 16%&ndash<br />37% of hillslope sediment production, and 50% of the hillslope sediment load is produced by only 23% of the watershed area. The model identifies priority locations for sediment control measures, and can be used to identify tradeoffs between sediment control and runoff production. Paving roads in priority areas would reduce total sediment yield by 30%, but may increase peak discharge moderately (1.6%&ndash<br />21%) at the outlet.
- Subjects :
- lcsh:Hydraulic engineering
Watershed
AnnAGNPS model
Geography, Planning and Development
0207 environmental engineering
urbanization
02 engineering and technology
010501 environmental sciences
Aquatic Science
01 natural sciences
Biochemistry
Article
sediment yield
Scenario analysis
lcsh:Water supply for domestic and industrial purposes
lcsh:TC1-978
020701 environmental engineering
Sedimentary budget
0105 earth and related environmental sciences
Water Science and Technology
Hydrology
lcsh:TD201-500
geography
soil erosion
geography.geographical_feature_category
Urbanization
Sediment yield
Sediment
scenario analysis
Sediment control
rainfall-runoff
Rill
Rainfall-runoff
Erosion
Soil erosion
Environmental science
Surface runoff
Channel (geography)
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Water 11(5), 1024 (2019), Helvia. Repositorio Institucional de la Universidad de Córdoba, instname, Water, Water, Vol 11, Iss 5, p 1024 (2019), Volume 11, Issue 5
- Accession number :
- edsair.doi.dedup.....77e1bec3233597e87fed571b95860175