Environmental Sciences - Articles List

Suggesting a Multi-Purpose Greenway Planning in Persian Coastal Areas Case studies: Anzali in the North Near the Caspian Sea and Bushehr in the South Near the Persian Gulf

Amin Rastande

Volume 5, Issue 2 , January 2008

Abstract

In the present article, the author seeks to define sustainable greenway planning along coastal areas in the North and South of Iran based both on the historical heritages of green routes in the country and international greenway theory that is concerned with American and British definitions. For this ... Read More

South Caspian River Mouth Configuration Under Human Impact and Sea level Fluctuations

Hamid Alizadeh Ketek Lahijani; Vahid Tavakoli,; Abdol Hossein Amini

Volume 5, Issue 2 , January 2008

Abstract

°°عـلـوممحـیدومشمارهپنجم،سالـطی،زمستان1386ENVIRONMENTAL SCIENCES Vol.5, No.2 , Winter 200865عـلـوممحـیـطیدومشمارهپنجم،سال،زمستان1386ENVIRONMENTAL SCIENCES Vol.5, No.2 , Winter 200865-86South Caspian River Mouth Configuration ... Read More °°عـلـوممحـیدومشمارهپنجم،سالـطی،زمستان1386ENVIRONMENTAL SCIENCES Vol.5, No.2 , Winter 200865عـلـوممحـیـطیدومشمارهپنجم،سال،زمستان1386ENVIRONMENTAL SCIENCES Vol.5, No.2 , Winter 200865-86South Caspian River Mouth Configuration Under Human Impact and Sea level Fluctuations Hamid Alizadeh Ketek Lahijani٭1, Vahid Tavakoli,1,2 , Abdol Hossein Amini21- Iranian National Center for Oceanography 2- Department of Geology, Faculty of Sciences, University of Tehran Abstract Rivers that flow from the Iranian coast to the Caspian Sea encompass 135,000 km2 of that catchment’s basin and supply 40 millionton sediment to the Caspian coast annually. The dynamics of river mouths and deltas are studied using hydrological data of the rivers, air photos, satellite images and geological and geomorphological maps as well as field observations and sediment sampling. Results from this study show that the morphology of the river mouths and deltas are mainly controlled by marine (ware-induced currents and sea level changes) and fluvial processes. Among these factors, sea level and riparian sediment supply have great variability. Analysis of hydrological data revealed that, during the past few decades with increasing human activities, the sediment supply of the rivers reduced from 10 to 40 %. The Caspian sea level has changed over a range of 3 m during instrumental measurements. The rivers are classified into three groups based on the morphology of their mouths and the nature of river/sea dynamics: Type 1 is rivers that enter to the sea through lagoons and lowlands. They have gained an ephemeral naturedue to increasing water consumption recently. Type 2 rivers have a normal flow into the Caspian Sea. They are common in steep slope coasts, where they are rarely affected by human activities and sea level changes. On moderately sloping coasts, they are slightly affected by long-shore currents of the sea. Some distributaries of the rivers enter into the sea independently. Some bars and lagoons are developed in the vicinity of the river's mouth, most commonly since the last sea level rise. Type 3 represents the great rivers with a significant sediment supply (Sefidrud River in the West and Gorganrud River in the East), producing deltas and mouth bars. They have high sediment discharge into the sea and are more greatly affected both by human activities and sea level changes

Establishing a Basic GIS Database for Madarsoo Watershed in Golestan (Iran)

Amin Hosseini Asl; Ali Akbar Matkan; Farideh Javid,; Hossein Pourali

Volume 5, Issue 2 , January 2008

Abstract

Remote-sensing and Geographic Information System (GIS) techniques have been utilized in this study to establish a GIS database for Madarsoo watershed in Golestan Province. Among the major constituents of this database we can refer to are: composite multicolor images from LANDSAT TM (30 m resolution); ... Read More