Practical decision-making in spatially distributed natural resource management is increasingly based on process models linked to Geographical Information Systems (GIS). Geo-spatial environmental data and decision support tools can now be made available to a much larger audience by using powerful personal computers and internet-accessible mapping tools. Traditionally decision support tools based...

Three different approaches using geographical information systems (GIs) and digital elevation models (DEMs) are described and evaluated for applying the Water Erosion Prediction Project (WEPP) model to assess water erosion in small watersheds. The first approach describes a typical application of the watershed version of WEPP using GIs only as an aidfor construction of required input files. The...

تحلیل طیف در مورد بررسی آثار فرهنگی به جا مانده از گذشته، بسامد و پسماند وقایع تاریخی است که وسیله ی آن آفرینش ذهنیت های جدید صورت می گیرد. همانند گفتمان میشل فوکو باعث تجسم عینیت بخشی گذشته گردد با فردی اجتماعی حاصل شود. ژان فرانسوا لیوتار نیز مطرح نمودن شرایط پسانوگرا بر این موضوع صحه گذارد. بسامد، دامنه ، تلفیق اعوجاج اختلال موارد مهم هستند. رمان وی (1963) اعلام قطعه 49 (1966) اثر تامس پینچن...

In recent decades, water erosion potential has been recognized as a severe threat against soil sustainability and resources. The present study was conducted to investigate the relation between geomorphometric parameters type simulate in Emamzadeh watershed located northeast of Khuzestan Province. primary secondary geomorphic parameters, including slope, plan curvature, profile flow length, accu...

Water erosion is a major environmental problem in many parts of the world. Majority of semi-arid countries are concerned because of their specific climate and soils sensitivity, but also because of the recent intensification of human activities and agricultural practices. Accurate estimation of water erosion for various land-use and climate scenarios is so an important key to define sustainable...

detachment, and sediment deposition are considered simultaneously. This approach has received experimenTwo modeling frameworks have been developed to describe and tal support (Proffitt et al., 1991; Proffitt et al., 1993; predict soil erosion and sediment deposition in recent years. The first Huang et al., 1999; Heilig et al., 2001), and lays the is based on the concept of transport capacity. D...

wepp model needs a great deal of input data.  identifying the model’s sensitive parameters and their prioritization increases the accuracy and efficiency of the model. on the other hand, wepp model can simulate processes affecting on runoff, erosion and sediment throughout the year. thus, model sensitivity must vary based on the storm occurrence time and parameters value in different sections o...