Analysis of morphodynamic changes of landforms in riverbed kalshour in the shirAhmad protected area in Sabzevar With an environmental perspective

Subject Areas : River Basin Environment

ebrahim taghavi moghadam ¹ , elahe akbari ² , Ali akbar Ehsanzadeh ³

1 - Ph.D Student of Geomorphology, Department of climatology and Geomorphology, Hakim Sabzevari University, Sabzevar, Iran *(Corresponding Author)
2 - Ph.D Student of remote sensing in Tehran University and Faculty of Geography, Hakim Sabzevari University, Sabzevar, Iran
3 - M.Sc Student of Geomorphology, Department of climatology and Geomorphology, Hakim Sabzevari University, Sabzevar, Iran

Received: 2016-02-07 Accepted : 2016-10-19 Published : 2020-09-22

Keywords: Landforms, ShirAhmad, kalshour‌, Maximum Likelihood, Remote sensing,

Abstract :

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 Conclusion:  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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