נגישות
menu      
חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Soil surface sealing effect on soil moisture at a semiarid hillslope: Implications for remote sensing estimation
Year:
2014
Source of publication :
remote sensing (source)
Authors :
אסולין, שמואל
;
.
Volume :
6
Co-Authors:
Sela, S., Geography and Environmental Development, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva, Israel
Svoray, T., Geography and Environmental Development, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva, Israel
Assouline, S., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet Dagan, Israel
Facilitators :
From page:
7469
To page:
7490
(
Total pages:
22
)
Abstract:
Robust estimation of soil moisture using microwave remote sensing depends on extensive ground sampling for calibration and validation of the data. Soil surface sealing is a frequent phenomenon in dry environments. It modulates soil moisture close to the soil surface and, thus, has the potential to affect the retrieval of soil moisture from microwave remote sensing and the validation of these data based on ground observations. We addressed this issue using a physically-based modeling approach that accounts explicitly for surface sealing at the hillslope scale. Simulated mean soil moisture at the respective layers corresponding to both the ground validation probe and the radar beam's typical effective penetration depth were considered. A cyclic pattern was found in which, as compared to an unsealed profile, the seal layer intensifies the bias in validation during rainfall events and substantially reduces it during subsequent drying periods. The analysis of this cyclic pattern showed that, accounting for soil moisture dynamics at the soil surface, the optimal time for soil sampling following a rainfall event is a few hours in the case of an unsealed system and a few days in the case of a sealed one. Surface sealing was found to increase the temporal stability of soil moisture. In both sealed and unsealed systems, the greatest temporal stability was observed at positions with moderate slope inclination. Soil porosity was the best predictor of soil moisture temporal stability, indicating that prior knowledge regarding the soil texture distribution is crucial for the application of remote sensing validation schemes. © 2014 by the authors.
Note:
Related Files :
Physically based modeling
rain
remote sensing
soil moisture
Soils
soil surveys
עוד תגיות
תוכן קשור
More details
DOI :
10.3390/rs6087469
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
30755
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:57
You may also be interested in
Scientific Publication
Soil surface sealing effect on soil moisture at a semiarid hillslope: Implications for remote sensing estimation
6
Sela, S., Geography and Environmental Development, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva, Israel
Svoray, T., Geography and Environmental Development, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva, Israel
Assouline, S., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet Dagan, Israel
Soil surface sealing effect on soil moisture at a semiarid hillslope: Implications for remote sensing estimation
Robust estimation of soil moisture using microwave remote sensing depends on extensive ground sampling for calibration and validation of the data. Soil surface sealing is a frequent phenomenon in dry environments. It modulates soil moisture close to the soil surface and, thus, has the potential to affect the retrieval of soil moisture from microwave remote sensing and the validation of these data based on ground observations. We addressed this issue using a physically-based modeling approach that accounts explicitly for surface sealing at the hillslope scale. Simulated mean soil moisture at the respective layers corresponding to both the ground validation probe and the radar beam's typical effective penetration depth were considered. A cyclic pattern was found in which, as compared to an unsealed profile, the seal layer intensifies the bias in validation during rainfall events and substantially reduces it during subsequent drying periods. The analysis of this cyclic pattern showed that, accounting for soil moisture dynamics at the soil surface, the optimal time for soil sampling following a rainfall event is a few hours in the case of an unsealed system and a few days in the case of a sealed one. Surface sealing was found to increase the temporal stability of soil moisture. In both sealed and unsealed systems, the greatest temporal stability was observed at positions with moderate slope inclination. Soil porosity was the best predictor of soil moisture temporal stability, indicating that prior knowledge regarding the soil texture distribution is crucial for the application of remote sensing validation schemes. © 2014 by the authors.
Scientific Publication
You may also be interested in