Analysis NetworkProcess in Evaluating Darakeh River-Valley's Ecological Function

The performance of landscape ecology and its subsequent changes are hierarchically associated with three levels: the construction of patched units of ecological corridors, the construction of corridor units of ecological networks, and the construction of ecological-humanistic landscape configuration.Where Tehran’s landscape is concerned, a lot of changes have happened in the quality of natural resource, and man-made constructions have increased. An important element of Tehran’s landscape in the north is its valuable natural resources in 7 river-valleys of Chitgar, Kan, Farahzad, Darakeh, Maqsoodbaik, Darband, and Darabad that extend from the west to the east, playing an essential role in promoting ecological interactions.The increasing developments of cities, growth in constructions, and environmental pollutions have seriously challenged these important elements of Tehran’s landscape. On the other hand, the principles of landscape ecology regarding the development of urban river-valleys highlight the importance of managing the landscape’s natural resources, and the need to include them in the hierarchical landscape planning. In order to get to the core of this subject and realize the levels of performance appraisals for urban river-valleys, the present study aims to evaluate the three levels of ecological performance for Darakeh River-Valley in Tehran’s landscape configuration by using the analytic network process. Any degradation in the biological and spatial quality of urban river corridors causes the biological and spatial transcendence of urban landscape to come to a stop. Therefore, in leading the sustainability program for river corridors, paying attention to the indicators of construction measurement alone in configuring applications and ecological patches are not enough, but the qualitative indicators for the performance of patches and corridors need to be considered in balancing, stabilizing, and transcending landscape ecological interactions. In this regard, the “SuperDecision” software is used.