Event Title

Using Hydrus_1D for Determining Conifer Forest Evapotraspiration coefficient in semi-arid mountain region

Presenter Information

Ling Lu
Scott Jones

Location

Eccles Conference Center

Event Website

http://water.usu.edu/

Start Date

3-30-2011 11:00 AM

End Date

3-30-2011 11:05 AM

Description

Mountain water cycle is playing important part in world water supply and climate movement. Evapotraspiration (ET) is one of major water exchanging processes between land and atmosphere. In order to understand the ET characteristics throughout the growing seasons in the mountain conifer forest ecosystem, a study was conducted in the conifer forest at TW Daniel Experimental Forest in Northern Utah. The study period was from June 18th 2010 (the day snow totally melt) to the September 31st 2010. Soil water content and soil temperature were measured every 30-min using Time Domain Transmissometry (TOT) sensor at the depth of 10-, 25-, and 50cm. Matric potential was measured by frequency domain with ceramic disks method in every 30-min interval. The meteorology data (precipitation, incident solar radiation, relative humidity, air temperature, wind speed and water vapor pressure) was measure in an eddy covariance tower installed nearby. The Hydrus_1 0 root uptake model was applied in this study to simulate the actual ET in the conifer forest. The simulated results were compared with the Landsat_7 observed ET. The FAO Penman-Monteith equation was to compute the reference ET. Comparing the model results and reference ET, an adjusted crop coefficient curve might be induced. This adjusted crop coefficient was influenced by local soil water content.

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Mar 30th, 11:00 AM Mar 30th, 11:05 AM

Using Hydrus_1D for Determining Conifer Forest Evapotraspiration coefficient in semi-arid mountain region

Eccles Conference Center

Mountain water cycle is playing important part in world water supply and climate movement. Evapotraspiration (ET) is one of major water exchanging processes between land and atmosphere. In order to understand the ET characteristics throughout the growing seasons in the mountain conifer forest ecosystem, a study was conducted in the conifer forest at TW Daniel Experimental Forest in Northern Utah. The study period was from June 18th 2010 (the day snow totally melt) to the September 31st 2010. Soil water content and soil temperature were measured every 30-min using Time Domain Transmissometry (TOT) sensor at the depth of 10-, 25-, and 50cm. Matric potential was measured by frequency domain with ceramic disks method in every 30-min interval. The meteorology data (precipitation, incident solar radiation, relative humidity, air temperature, wind speed and water vapor pressure) was measure in an eddy covariance tower installed nearby. The Hydrus_1 0 root uptake model was applied in this study to simulate the actual ET in the conifer forest. The simulated results were compared with the Landsat_7 observed ET. The FAO Penman-Monteith equation was to compute the reference ET. Comparing the model results and reference ET, an adjusted crop coefficient curve might be induced. This adjusted crop coefficient was influenced by local soil water content.

https://digitalcommons.usu.edu/runoff/2011/Posters/21