Effect of forest covers on water conservation and surface runoff reduction in Bazoft river basin

تحقیقات جنگل و صنوبر ایران

Shahram Khalighi¹  Mostafa Panahi²  Zahra Mashayekhi³  Fateme Bakhtiari³  Mahmoud Karami⁴  Sayyed Khoshsolat⁵ 

[1] Assistant Prof., Faculty of Natural Resources, University of Tehran;Assistant Prof., Islamic Azad University, Science and Research branch;M.Sc. in Environmental Science, University of Tehran;Prof., Faculty of Natural Resources, University of Tehran;Senior Forest Expert, Forests, Rangelands and Watershed Management Organization;

关键词: runoff;    curve number;    scenario;    forest cover;    Bazoft;    lag time;    concentration time;   

DOI  :  

来源: DOAJ

【 摘 要 】

Function of water retention and avoidance of its loss, is one of the most important functions and services of the forest ecosystems which has a major role in provision of human welfare. In this study, in order to estimate the effect of forest cover on water retention and surface runoff reduction, the runoff depth has been calculated using Curve Number method. Firstly, study area has been homogenized in the basis of land use/land cover and hydrologic soil groups' characteristics and the Curve Number of each homogeneous unit determined. Thus, the average weighted Curve Number for entire of the basin has been calculated. Lag time and time of concentration parameters of the basin were also calculated. Then, the input data were entered into the HEC-HMS model and the model was run using Curve Number (SCS) method for six observed rainfall-runoff events. Four hypothetical scenarios have been developed for the concept of water retention by forests and repeated the running of model for the developed scenarios. Results showed that in the case of scenario 1 which assumes that the entire of watershed area is covered by forests, the values of initial loss and lag time in the watershed has increased while Curve Number and flood peak discharge values decreased that indicates the role of forest cover on the prevention of water loss and its retention in the soil. Furthermore, the volume of infiltrated water in scenario 1 is about 2.7×106 m3.

【 授权许可】

Unknown