Estimation of unsaturated hydraulic conductivity function: implication of low to high suction measurements

Saha, Abhisekh; Sekharan, Sreedeep

doi:10.1007/s11600-021-00548-y

Artykuł - szczegóły

Tytuł artykułu

Estimation of unsaturated hydraulic conductivity function: implication of low to high suction measurements

Autorzy

Saha Abhisekh , Sekharan Sreedeep

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-021-00548-y

Warianty tytułu

Języki publikacji

Abstrakty

Establishment of the relationship between soil suction and water content, commonly termed as soil–water characteristic curve (SWCC), is of prime importance in the feld of unsaturated soil mechanics. There are several instruments available that can be used to measure the SWCC of soil, but every suction measuring device has its own limitations in terms of its suction measurement range. Therefore, the preciseness of the estimated unsaturated soil properties largely depends on the range of suction measurements and the type of instruments used. The primary objective of this study is to quantify the error that can occur during the estimation of unsaturated hydraulic conductivity function (UHCF) from SWCC for low plastic soils. Experiments were performed to investigate the infuence of diferent suction measurement devices on the estimated UHCF for four diferent soils with varying clay content. A dew point potentiometer (WP4) and a miniature tensiometer (T5) have been used in this study for the suction measurement. The SWCC of the selected soils were predicted mathematically using a commonly used pedo-transfer function (PTF). The experimental results clearly indicated that the sole use of WP4 overestimated the SWCC parameters, as well as UHCF (overestimation in the conductivity value is in order of 104 times). Rather, a combination of T5 and WP4 data, within their accurate range, provides a more precise estimation of UHCF. Further, the accuracy of the PTF was found very efective for low plastic soils with a relatively low percentage of clay (% clay < 10), in the absence of any experimental data.

Słowa kluczowe

dew point potentiometer tensiometer soil plasticity pedo-transfer function HYDRUS-1D unsaturated hydraulic conductivity

potencjometr punktu rosy tensjometr plastyczność gleby HYDRUS-1D funkcja transferu pedo

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2021

Tom

Vol. 69, no. 2

Strony

547--559

Opis fizyczny

Bibliogr. 55 poz.

Twórcy

autor

Saha Abhisekh

abhisekh@iitg.ac.in

Department of Civil Engineering, Indian Institute of Technology, Guwahati, Assam, Indi

https://orcid.org/0000-0002-4771-572X

autor

Sekharan Sreedeep

srees@iitg.ac.in

Department of Civil Engineering, Indian Institute of Technology, Guwahati, Assam, Indi

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Bibliografia

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