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Measuring soil hydraulic properties ...

Zhang, Yousheng.

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Measuring soil hydraulic properties with a double ring tension infiltrometer.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Measuring soil hydraulic properties with a double ring tension infiltrometer./
作者:	Zhang, Yousheng.
面頁冊數:	165 p.
附註:	Source: Dissertation Abstracts International, Volume: 57-07, Section: B, page: 4103.
Contained By:	Dissertation Abstracts International57-07B.
標題:	Agriculture, Agronomy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9638727
ISBN:	0591045419

Measuring soil hydraulic properties with a double ring tension infiltrometer.
Zhang, Yousheng.

Measuring soil hydraulic properties with a double ring tension infiltrometer. - 165 p.

Source: Dissertation Abstracts International, Volume: 57-07, Section: B, page: 4103.

Thesis (Ph.D.)--Colorado State University, 1996.

Modeling water and chemical movement in unsaturated field soils requires a relationship between soil hydraulic conductivity, K, and soil water suction head, h. This relationship must represent field conditions. However, the popularly used in-situ methods are time consuming, expensive and often inadequate where high spatial variations exist. The ordinary tension infiltrometer (OTI) is presently used to measure hydraulic conductivities of soils that are nearly saturated, but there are disadvantages to the analysis methods for this device.

ISBN: 0591045419Subjects--Topical Terms:

1018679
Agriculture, Agronomy.

Measuring soil hydraulic properties with a double ring tension infiltrometer.
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245 1 0 $a Measuring soil hydraulic properties with a double ring tension infiltrometer.
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500 $a Source: Dissertation Abstracts International, Volume: 57-07, Section: B, page: 4103.
502 $a Thesis (Ph.D.)--Colorado State University, 1996.
520 $a Modeling water and chemical movement in unsaturated field soils requires a relationship between soil hydraulic conductivity, K, and soil water suction head, h. This relationship must represent field conditions. However, the popularly used in-situ methods are time consuming, expensive and often inadequate where high spatial variations exist. The ordinary tension infiltrometer (OTI) is presently used to measure hydraulic conductivities of soils that are nearly saturated, but there are disadvantages to the analysis methods for this device.
520 $a In this dissertation, a new device, the double-ring tension infiltrometer (DTI), is introduced to improve the process of soil hydraulic conductivity measurement, and an improved method, called the double ring method (DRM), is introduced to calculate the hydraulic conductivity integral (HCI). A parameter matching process is also introduced, which uses measured values of K and HCI to fit parameters of commonly used algebraic hydraulic conductivity models. The double ring regression method is developed to improve the accuracy of K(h) values if the steady state infiltration cannot be reached. To avoid effects of capping materials and soil surface crusts on K(h) measurement, another method is proposed which requires only the steady infiltration rate of the inner ring area of the DTI in calculation to fit K(h) model parameters for surface crusts, capping materials and subsoils.
520 $a The double ring method (DRM) and the double ring regression method (DRRM) are verified using numerical model simulation results and field measurements made with the double ring tension infiltrometer. The values of saturated and nearly saturated soil hydraulic conductivities and HCI calculated by DRM and DRRM are more accurate than the ordinary method (Ankeny et al, 1991). However, the accuracy of DRM decreases for finer soil texture and greater imposed head conditions because it is more difficult to achieve steady state infiltration. The DRM can be used to accurately fit parameters of commonly used K(h) models. Results warrant the adaptation and suggested further evaluation of the device.
590 $a School code: 0053.
650 4 $a Agriculture, Agronomy. $3 1018679
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