واکاوی تغییر و تحولات مورفودینامیک لندفرم ها و بستر رودخانه کال شور درمحدوده منطقه حفاظت شده شیر احمد سبزوار با دیدگاه زیست محیطی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه حکیم سبزواری

2 عضو هیئت علمی دانشگاه حکیم سبزواری

10.22034/jest.2018.15811.2432

چکیده

Background and Objective: Knowledge of the characteristics of morphodynamic river systems, Landform and its evolution as one of the most vital components of the Earth's surface that In many studies and projects, including the flood control, watershed studies, and environmental hydrology of the basic requirements for environmental planners. This study aimed to evaluate the changes of landforms and the KalShour riverbed in protected area ShirAhmad is Sabzevar emphasis on environmental considerations
Method: in the Research using topographic map and satellite images of Landsat, years 1988, 2000 and 2015. For this purpose, was determined changes kaleshor of riverbed and morphodinamic landform changes occurred in the study period of 27 years and Using maximum likelihood map landforms and account for the years of research and changes in any areas identified and analyzed and assessed.
Findings: Calculations show that the rivers in the region of 8.1 km2 kalshour shorter and less meandering, and become more the radius of the circle is tangent to any show that has become curved meander pattern to direct arterial. The map Landforms has changed was produced with maximum likelihood and overall accuracy0.78 and kappa coefficient 0.84.
Discussion and Counclusion: The results show a large changes of sand dunes and vegetation especially.Based on the results, because of having high groundwater levels and also enter wastewater Sabzevar and.31.5 km2 of sand dunes volume reduction and conversion to fields Tamarix hispida and forest Tamarix.This issue is for the benefit of the natural landscape and on the other hand depletes water resources and soil and adverse impact on animal life protected area's Shirahmd that require special strategic programs in order to preserve natural heritage and sustainable development.

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