Effect of spatial and temporal variability of antecedent moisture content on model-generated runoff from an arid watershed

William J. Meyer, Sajjad Ahmad, Michael H. Young, David S. Shafer, Julianne J. Miller, Karletta Chief

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The objectives of the research are to determine the importance and impact of spatial and temporal variation of soil hydraulic properties on calculated runoff volumes. The study also addresses the importance of storm frequency and its relationship to rainfall/runoff processes and spatial variation of soil hydraulic properties. A pedo-transfer function, based on soil physical properties, was developed to predict the variation of antecedent moisture content (AMC) with increasing time between storm events. The effective hydraulic conductivity (Keff) was evaluated at a value of half the calculated saturated hydraulic conductivity. The AMC was varied for three different scenarios on 7 individual soil surfaces located within a 228 km2 (88 mi2) arid watershed in the Mojave Desert. The modeling software packages used for the study were Rosetta, HYDRUS-1D, and FLO-2D. All data were geospatially rectified on the watershed (using ArcGIS) to account for the spatial variation of the soil parameters. Temporal variation of water content on each soil surface was evaluated using atmospheric demand and the soil properties over a 5-day period. The results show that the spatial variability of Ks and AMC have considerable effect on predicted flowrates due to varied precipitation and varied soil water content, which for the upper watershed were shown to increase as storm frequency decreases (i.e., return interval increases). As the drying time increases from 1 to 5 days, the calculated runoff reduces 46 percent (at the upper watershed) for the 100-year models. The model shows that the floodwave from upstream does progress to the outfall for the 500-year event; however, the majority of run-on and runoff infiltrates on the lower portion of the watershed for the 100-year and higher frequency events.

Original languageEnglish (US)
Title of host publicationWorld Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress
Pages1137-1146
Number of pages10
DOIs
StatePublished - 2011
Externally publishedYes
EventWorld Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Palm Springs, CA, United States
Duration: May 22 2011May 26 2011

Other

OtherWorld Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability
CountryUnited States
CityPalm Springs, CA
Period5/22/115/26/11

Fingerprint

moisture content
watershed
runoff
spatial variation
hydraulic property
hydraulic conductivity
soil surface
temporal variation
soil
water content
transfer function
soil property
desert
physical property
soil water
effect
software
rainfall
modeling

Keywords

  • Arid lands
  • Moisture
  • Runoff
  • United States
  • Watersheds

ASJC Scopus subject areas

  • Environmental Science(all)

Cite this

Meyer, W. J., Ahmad, S., Young, M. H., Shafer, D. S., Miller, J. J., & Chief, K. (2011). Effect of spatial and temporal variability of antecedent moisture content on model-generated runoff from an arid watershed. In World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress (pp. 1137-1146) https://doi.org/10.1061/41173(414)117

Effect of spatial and temporal variability of antecedent moisture content on model-generated runoff from an arid watershed. / Meyer, William J.; Ahmad, Sajjad; Young, Michael H.; Shafer, David S.; Miller, Julianne J.; Chief, Karletta.

World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress. 2011. p. 1137-1146.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Meyer, WJ, Ahmad, S, Young, MH, Shafer, DS, Miller, JJ & Chief, K 2011, Effect of spatial and temporal variability of antecedent moisture content on model-generated runoff from an arid watershed. in World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress. pp. 1137-1146, World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability, Palm Springs, CA, United States, 5/22/11. https://doi.org/10.1061/41173(414)117
Meyer WJ, Ahmad S, Young MH, Shafer DS, Miller JJ, Chief K. Effect of spatial and temporal variability of antecedent moisture content on model-generated runoff from an arid watershed. In World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress. 2011. p. 1137-1146 https://doi.org/10.1061/41173(414)117
Meyer, William J. ; Ahmad, Sajjad ; Young, Michael H. ; Shafer, David S. ; Miller, Julianne J. ; Chief, Karletta. / Effect of spatial and temporal variability of antecedent moisture content on model-generated runoff from an arid watershed. World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress. 2011. pp. 1137-1146
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AB - The objectives of the research are to determine the importance and impact of spatial and temporal variation of soil hydraulic properties on calculated runoff volumes. The study also addresses the importance of storm frequency and its relationship to rainfall/runoff processes and spatial variation of soil hydraulic properties. A pedo-transfer function, based on soil physical properties, was developed to predict the variation of antecedent moisture content (AMC) with increasing time between storm events. The effective hydraulic conductivity (Keff) was evaluated at a value of half the calculated saturated hydraulic conductivity. The AMC was varied for three different scenarios on 7 individual soil surfaces located within a 228 km2 (88 mi2) arid watershed in the Mojave Desert. The modeling software packages used for the study were Rosetta, HYDRUS-1D, and FLO-2D. All data were geospatially rectified on the watershed (using ArcGIS) to account for the spatial variation of the soil parameters. Temporal variation of water content on each soil surface was evaluated using atmospheric demand and the soil properties over a 5-day period. The results show that the spatial variability of Ks and AMC have considerable effect on predicted flowrates due to varied precipitation and varied soil water content, which for the upper watershed were shown to increase as storm frequency decreases (i.e., return interval increases). As the drying time increases from 1 to 5 days, the calculated runoff reduces 46 percent (at the upper watershed) for the 100-year models. The model shows that the floodwave from upstream does progress to the outfall for the 500-year event; however, the majority of run-on and runoff infiltrates on the lower portion of the watershed for the 100-year and higher frequency events.

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