Estimation of Soil Hydraulic Parameters with Measurment of Soil Water Content, Pressure Head or Measurment the Simultaneously by Inverse Method

Most processes of soil and water in the field occur in unsaturated conditions.In the field, It’s possible to estimate soil hydraulic properties by measurement of soil water content and soil water pressure head in different times, using inverse method. In the other hand, it’s difficult, time consumin...

Full description

Bibliographic Details
Main Authors: Maedeh MahmodianShoshtari, Shahrokh Zandpars, Mehdi Mahbod
Format: Article
Language:fas
Published: Shahid Chamran University of Ahvaz 2014-07-01
Series:علوم و مهندسی آبیاری
Subjects:
Online Access:http://jise.scu.ac.ir/article_10951_6831f5ebf261c275642dd1e4edd6d42a.pdf
id doaj-e1281a348ace42cbada883dd92d5abae
record_format Article
spelling doaj-e1281a348ace42cbada883dd92d5abae2020-11-25T02:33:16ZfasShahid Chamran University of Ahvazعلوم و مهندسی آبیاری2588-59522588-59602014-07-0137211512410951Estimation of Soil Hydraulic Parameters with Measurment of Soil Water Content, Pressure Head or Measurment the Simultaneously by Inverse MethodMaedeh MahmodianShoshtari0Shahrokh Zandpars1Mehdi Mahbod2دانشگاه شیرازدانشگاه شیرازدانشگاه شیرازMost processes of soil and water in the field occur in unsaturated conditions.In the field, It’s possible to estimate soil hydraulic properties by measurement of soil water content and soil water pressure head in different times, using inverse method. In the other hand, it’s difficult, time consuming and costly to measuring soil water content and water pressure head simultaneously. So, in this paper, the possibility of predicting soil hydraulic properties by measurement of soil water content or water pressure head separately were studied. To do this job, ESHPIM2, an inversion approach computer model, has been used. In this model, soil hydraulic parameters are optimized to reach the minimum value of objective function (Summation of squared differences between measured and predicted soil water content or water pressure head) using genetic algorithm. Soil hydraulic parameters of four soil series at Agricultural College of Shiraz University were studied in three cases. In the first case, the ESHPIM2 model with the objective function based on measuring the soil water pressure head and in the second case, the ESHPIM2 model with the objective function based on measuring the soil water content are used. Moreover, in the third case, soil hydraulic parameters are estimated by measuring soil water content and soil water pressure simultaneously. The results show that soil hydraulic parameters are predicted more appropriately by measuring soil water pressure head than soil water content in studied soils by inverse method using ESHPIM2 model. <br />http://jise.scu.ac.ir/article_10951_6831f5ebf261c275642dd1e4edd6d42a.pdfkeywords: estimating soil water propertiesinverse methodgenetic algorithmsoil water retention curveeshpim2 model
collection DOAJ
language fas
format Article
sources DOAJ
author Maedeh MahmodianShoshtari
Shahrokh Zandpars
Mehdi Mahbod
spellingShingle Maedeh MahmodianShoshtari
Shahrokh Zandpars
Mehdi Mahbod
Estimation of Soil Hydraulic Parameters with Measurment of Soil Water Content, Pressure Head or Measurment the Simultaneously by Inverse Method
علوم و مهندسی آبیاری
keywords: estimating soil water properties
inverse method
genetic algorithm
soil water retention curve
eshpim2 model
author_facet Maedeh MahmodianShoshtari
Shahrokh Zandpars
Mehdi Mahbod
author_sort Maedeh MahmodianShoshtari
title Estimation of Soil Hydraulic Parameters with Measurment of Soil Water Content, Pressure Head or Measurment the Simultaneously by Inverse Method
title_short Estimation of Soil Hydraulic Parameters with Measurment of Soil Water Content, Pressure Head or Measurment the Simultaneously by Inverse Method
title_full Estimation of Soil Hydraulic Parameters with Measurment of Soil Water Content, Pressure Head or Measurment the Simultaneously by Inverse Method
title_fullStr Estimation of Soil Hydraulic Parameters with Measurment of Soil Water Content, Pressure Head or Measurment the Simultaneously by Inverse Method
title_full_unstemmed Estimation of Soil Hydraulic Parameters with Measurment of Soil Water Content, Pressure Head or Measurment the Simultaneously by Inverse Method
title_sort estimation of soil hydraulic parameters with measurment of soil water content, pressure head or measurment the simultaneously by inverse method
publisher Shahid Chamran University of Ahvaz
series علوم و مهندسی آبیاری
issn 2588-5952
2588-5960
publishDate 2014-07-01
description Most processes of soil and water in the field occur in unsaturated conditions.In the field, It’s possible to estimate soil hydraulic properties by measurement of soil water content and soil water pressure head in different times, using inverse method. In the other hand, it’s difficult, time consuming and costly to measuring soil water content and water pressure head simultaneously. So, in this paper, the possibility of predicting soil hydraulic properties by measurement of soil water content or water pressure head separately were studied. To do this job, ESHPIM2, an inversion approach computer model, has been used. In this model, soil hydraulic parameters are optimized to reach the minimum value of objective function (Summation of squared differences between measured and predicted soil water content or water pressure head) using genetic algorithm. Soil hydraulic parameters of four soil series at Agricultural College of Shiraz University were studied in three cases. In the first case, the ESHPIM2 model with the objective function based on measuring the soil water pressure head and in the second case, the ESHPIM2 model with the objective function based on measuring the soil water content are used. Moreover, in the third case, soil hydraulic parameters are estimated by measuring soil water content and soil water pressure simultaneously. The results show that soil hydraulic parameters are predicted more appropriately by measuring soil water pressure head than soil water content in studied soils by inverse method using ESHPIM2 model. <br />
topic keywords: estimating soil water properties
inverse method
genetic algorithm
soil water retention curve
eshpim2 model
url http://jise.scu.ac.ir/article_10951_6831f5ebf261c275642dd1e4edd6d42a.pdf
work_keys_str_mv AT maedehmahmodianshoshtari estimationofsoilhydraulicparameterswithmeasurmentofsoilwatercontentpressureheadormeasurmentthesimultaneouslybyinversemethod
AT shahrokhzandpars estimationofsoilhydraulicparameterswithmeasurmentofsoilwatercontentpressureheadormeasurmentthesimultaneouslybyinversemethod
AT mehdimahbod estimationofsoilhydraulicparameterswithmeasurmentofsoilwatercontentpressureheadormeasurmentthesimultaneouslybyinversemethod
_version_ 1724815261411835904