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In Situ Soil Moisture Sensors in Undisturbed Soils
Published on: November 18, 2022
MODIS-aided statewide net groundwater-recharge estimation in Nebraska
1School of Natural Resources, University of Nebraska-Lincoln, 3310 Holdrege Street HH625, Lincoln, NE 68583.Department of Hydraulic and Water Resources Engineering, Budapest University of Technology and Economics, Muegyetem Rakpart 3-9, H-1111 Budapest, Hungary.
Ground Water
|December 11, 2012
Summary
Nebraska
Area of Science:
- Hydrology
- Remote Sensing
- Environmental Science
Background:
- Accurate estimation of groundwater recharge is crucial for water resource management.
- Previous studies lacked high spatial resolution for groundwater recharge in Nebraska.
- Understanding recharge dynamics is vital for sustainable irrigation and shallow groundwater modeling.
Purpose of the Study:
- To estimate monthly net groundwater recharge across Nebraska at a 1-km resolution from 2000-2009.
- To identify spatial patterns of groundwater recharge, including areas of depletion.
- To refine recharge estimation methods using remote sensing data.
Main Methods:
- Utilized MODIS (MODerate resolution Imaging Spectroradiometer) daytime surface temperature data.
- Applied the Priestley-Taylor equation and complementary relationship of evaporation to calculate evapotranspiration (ET).
- Integrated ET, precipitation, and groundwater vulnerability (DRASTIC code) to quantify net recharge.
Main Results:
- Statewide mean annual net recharge was estimated at 29 mm (5% of precipitation).
- Highest recharge rates (>100 mm/year) observed in eastern Sand Hills and eastern Nebraska.
- Significant negative recharge (declining groundwater) identified in southwestern Nebraska due to irrigation.
Conclusions:
- The study provides high-resolution spatial estimates of net groundwater recharge.
- The method successfully quantifies negative net recharge, important for shallow groundwater modeling.
- Findings confirm previous estimates while offering improved spatial detail and identifying critical areas of groundwater depletion.
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