Evaluation of the soil moisture content using GIS technique and SWAT model, (Wadi Al-Naft region: as a case study)

International Conference on Materials Engineering and Science

Mohamed, Mahmood J.^1 ; Omran, Isam I.^2 ; Abidalla, Wisam A.^2

Ministry of Water Resources, Al-Furat Al-Awsat Technical University, Babylon

51009, Iraq^1

Al-Mussaib Technical Institute, Al-Furat Al-Awsat Technical University, Babylon

51009, Iraq^2

关键词: Basic parameters;    Catchment planning;    Correlation coefficient;    Digital modeling of the elevations;    Meteorological data;    Sustainable water management;    SWAT;    Urban and rural;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/454/1/012021/pdf
DOI  :  10.1088/1757-899X/454/1/012021

来源: IOP

【 摘 要 】

Soil moisture content is one of the basic parameters required to study the strategy of sustainable water management within urban and rural uses. Wadi Al-Nafat region was chosen as a study site within a total area of 8,820 km2, which is located in the northeast of Diyala province in the country of Iraq. The net area of the main catchment planning was 4926 km2 or about 56% of the total study area. The main catchment area was divided into 83 sub - catchments for the purpose of completing the application of the GIS technique and SWAT model. They were used to calculate the soil moisture content based on input data represented by the digital model of the elevation levels, meteorological data, uses of land and soil at the study site with the application of the SCS-CN mathematical model, and then determined water losses associated with average Annual Curve Number 73 during the period 2010 to 2016.The results of SWAT simulation showed that the annual rate of soil moisture content is 41.26 mm comparing with the 46.74 mm from field works during the same period with a difference of about 11%. The study also explained the efficient use of SWAT model and GIS technique in predicting the soil moisture content values and compares them with field results. It is noted that the correlation coefficient between soil moisture content measured by field works and soil moisture content calculated according to SWAT model simulation is 97%. Study results are encouraging the use of these techniques in areas lacking hydrologic and topographic parameters and thereby reduce the need for human and economic sources.