Predicting the Hydraulic Conductivity of Unsaturated Soils from a Soil Moisture Profile

2006 ◽  
Author(s):  
T. Sugii
Keyword(s):  
Soil Moisture ◽  
Hydraulic Conductivity ◽  
Unsaturated Soils ◽  
Moisture Profile ◽  
Soil Moisture Profile

scholarly journals A Fiber Bragg-Grating-Based Miniature Sensor for the Fast Detection of Soil Moisture Profiles in Highway Slopes and Subgrades

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4431 ◽  
Author(s):  
Dingfeng Cao ◽  
Hongyuan Fang ◽  
Fuming Wang ◽  
Honghu Zhu ◽  
Mengya Sun
Keyword(s):  
Soil Moisture ◽  
Hydraulic Conductivity ◽  
Aluminum Oxide ◽  
Fiber Bragg Grating ◽  
Construction Materials ◽  
Water Infiltration ◽  
Bragg Grating ◽  
Moisture Profile ◽  
Fast Detection ◽  
Soil Moisture Profile

A fiber Bragg grating (FBG)-based aluminum oxide tube packed sensor (ATPS) was developed for the fast detection of the soil moisture profile in highway slopes and subgrades. The novel ATPS consists of an aluminum oxide tube with a diameter of 5 mm, an optical fiber containing a quasi-distributed FBG sensors, a “U”-shaped resistance wire, and a flange. There are four 0.9-mm diameter holes in the ATPS. Laboratory experiments were carried out to calibrate the relationship between the thermal response of ATPS and the soil moisture content. Two laboratory rainfall validation model tests were performed to validate the ATPS for capturing the soil moisture profile in highway slopes and subgrades. During the validations, the accuracy of the ATPS was quantified, and water infiltration through grassy and grassless ground surfaces were investigated. The calibrations indicate that the ATPS can detect and record real-time changes in the highway slope and subgrade moisture after rainfall, and reveal the most dangerous zones that occur at the connection between different construction materials. The average measurement accuracy of soil moisture monitoring was 0.015 m3/m3. Please note that the connection is where cracks form easily and the soil hydraulic conductivity increases significantly. The test results also indicate that grassy cover (lawn) significantly prevents water infiltration during the first few minutes of rainfall (twelve minutes in this study), after which, however, the infiltration rate drops sharply. The influence of lawn on water infiltration depends on the soil structure, hydraulic conductivity, and rainfall time. In summary, due to its small size and fast detection, the ATPS is a portable probe that can be used for moisture monitoring in highway slopes and subgrades.

scholarly journals Frozen soil parameterization in a distributed biosphere hydrological model

2009 ◽  
Vol 6 (6) ◽  
pp. 6895-6928
Author(s):  
L. Wang ◽  
T. Koike ◽  
K. Yang ◽  
R. Jin ◽  
H. Li
Keyword(s):  
Soil Moisture ◽  
Land Surface ◽  
Hydrological Model ◽  
Frozen Soil ◽  
Surface Radiation ◽  
Moisture Profile ◽  
Flood Peak ◽  
Radiation Fluxes ◽  
Soil Moisture Profile ◽  
The Web

Abstract. In this study, a frozen soil parameterization has been modified and incorporated into a distributed biosphere hydrological model (WEB-DHM). The WEB-DHM with the frozen scheme was then rigorously evaluated in a small cold area, the Binngou watershed, against the in-situ observations from the WATER (Watershed Allied Telemetry Experimental Research). In the summer 2008, land surface parameters were optimized using the observed surface radiation fluxes and the soil temperature profile at the Dadongshu-Yakou (DY) station in July; and then soil hydraulic parameters were obtained by the calibration of the July soil moisture profile at the DY station and by the calibration of the discharges at the basin outlet in July and August that covers the annual largest flood peak of 2008. The calibrated WEB-DHM with the frozen scheme was then used for a yearlong simulation from 21 November 2007 to 20 November 2008, to check its performance in cold seasons. Results showed that the WEB-DHM with the frozen scheme has given much better performance than the WEB-DHM without the frozen scheme, in the simulations of soil moisture profile at the DY station and the discharges at the basin outlet in the yearlong simulation.

Retrieval of soil moisture profile by combined C-band scatterometer data and a surface hydrological model

2000 ◽  
Author(s):  
Claudia Notarnicola ◽  
Angelo C. D'Alessio ◽  
Francesco Posa ◽  
Vincenzo Sabatelli ◽  
Domenico Casarano
Keyword(s):  
Soil Moisture ◽  
Hydrological Model ◽  
Moisture Profile ◽  
Soil Moisture Profile

Temporal stability of soil moisture profile

2006 ◽  
Vol 324 (1-4) ◽  
pp. 400-411 ◽  
Author(s):  
Patrick J. Starks ◽  
Gary C. Heathman ◽  
Thomas J. Jackson ◽  
Michael H. Cosh
Keyword(s):  
Soil Moisture ◽  
Temporal Stability ◽  
Moisture Profile ◽  
Soil Moisture Profile
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