Using observations and a distributed hydrologic model to explore runoff thresholds linked with mesquite encroachment in the Sonoran Desert

Nicole A. Pierini, Enrique Vivoni, Agustin Robles-Morua, Russell L. Scott, Mark A. Nearing

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Woody plant encroachment is a world wide phenomenon with implications on the hydrologic cycle at the catchment scale that are not well understood. In this study, we use observations from two small semiarid watersheds in southern Arizona that have been encroached by the velvet mesquite tree and apply a distributed hydrologic model to explore runoff threshold processes experienced during the North American monsoon. The paired watersheds have similar soil and meteorological conditions, but vary considerably in terms of vegetation cover (mesquite, grass, bare soil) and their proportions with one basin having undergone mesquite removal in 1974. Long-term observations from the watersheds exhibit changes in runoff production over time, such that the watershed with more woody plants currently has less runoff for small rainfall events, more runoff for larger events, and a larger runoff ratio during the study periods (summers 2011 and 2012). To explain this observation, we first test the distributed model, parameterized with high-resolution (1 m) terrain and vegetation distributions, against continuous data from an environmental sensor network, including an eddy covariance tower, soil moisture, and temperature profiles in different vegetation types, and runoff observations. We find good agreement between the model and observations for simultaneous water and energy states and fluxes over a range of measurement scales. We then identify that the areal fraction of grass (bare soil) cover determines the runoff response for small (large) rainfall events due to the dominant controls of antecedent wetness (hydraulic conductivity). These model-derived mechanisms explain how woody plants have differential effects on runoff in semiarid basins depending on precipitation event sizes. Key Points Paired watersheds show long-term runoff changes due to mesquite removal Model agreement with sensor network over a range of scales and variables Model explains how woody plants control runoff depending on storm size

Original languageEnglish (US)
Pages (from-to)8191-8215
Number of pages25
JournalWater Resources Research
Volume50
Issue number10
DOIs
StatePublished - Oct 1 2014

Fingerprint

desert
runoff
woody plant
watershed
bare soil
grass
sensor
rainfall
soil cover
eddy covariance
basin
temperature profile
vegetation type
vegetation cover
soil temperature
hydraulic conductivity
monsoon
soil moisture
catchment
vegetation

Keywords

  • environmental sensor network
  • Light Detection and Ranging
  • North American monsoon
  • streamflow yield
  • watershed
  • woody plant encroachment

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Using observations and a distributed hydrologic model to explore runoff thresholds linked with mesquite encroachment in the Sonoran Desert. / Pierini, Nicole A.; Vivoni, Enrique; Robles-Morua, Agustin; Scott, Russell L.; Nearing, Mark A.

In: Water Resources Research, Vol. 50, No. 10, 01.10.2014, p. 8191-8215.

Research output: Contribution to journalArticle

Pierini, Nicole A. ; Vivoni, Enrique ; Robles-Morua, Agustin ; Scott, Russell L. ; Nearing, Mark A. / Using observations and a distributed hydrologic model to explore runoff thresholds linked with mesquite encroachment in the Sonoran Desert. In: Water Resources Research. 2014 ; Vol. 50, No. 10. pp. 8191-8215.
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