جستجوی مقالات مرتبط با کلیدواژه « حوضه آبریز » در نشریات گروه « اکولوژی »

The Sudanese system is the most important system for supplying rainfall and water accumulation in the southern catchments. In the years when suitable synoptic conditions are provided for strengthening and expanding this system on Iran, not only the southern part of the country but also most parts of the country are associated with good rainfall. Therefore, increasing or decreasing the number of Sudanese systems entering the region is very important and vital in theEco-biological structure of wetlandsand water balance of the most water-rich basins in the south and southwest of the country. In the present study, the aim is to study the historical trend of the entry of this system (1995-2017) into this part of the country. Therefore, after validating the daily precipitation data from 1995 to 2017 of selected stations, precipitation systems of independent Sudanese origin based on selected criteria from the three main routes of Hormozgan, Bushehr and Khuzestan (by year, month and duration) are identified and used. From the statistical indicators of the best fit line, Mann-Kendall and Sen’s slope estimator, their time changes at the confidence level of 0.95 were examined and analyzed. The results showed;Despite the trend and slope of decreasing changes in the frequency of entry of Sudanese systems, but due to the lack of significant trends, the frequency of entry of Sudanese systems in all three routes is stable, and lacks a trend that can be attributed to climate change.However, the period of continuous rainfall of Sudanese systems in all three routes is short and generally in the form of 1 to 3 day systems and rarely their period of activity is 5 days or more.Therefore, the scarcity and nature of the showers and short-term precipitation of the Sudanese systems should still be accepted as a principle and in the future we should expect the occurrence of droughts and heavy and torrential rains from the Sudanese system.As a result, the sustainability of aquatic ecosystems, wetlands and water basins in the south and southwest of the country will be fragile in the future.

The present study seeks to introduce the capabilities and advantages of the strategic model of Meta- Swot in the form of relevant software in wetland planning. The resource is based on resource-based theory (RBV). This theory believes that unique resources and capabilities form the main factor of continuous and sustainable competitive advantage. Accordingly, wetlands can identify their sustainable competitive advantages by programming in principle and recognizing valuable, irreplaceable, rare, and irreplaceable (VRIO) resources and capabilities compared to competitors. At first, the Environment Protection Organization’s aim was to extract in related with wetland, then each of the goals prioritized by experts. Then Wetland Strategic Indicators to succession determined and weighted by Delphi and technique like and indicators for evaluation was identified. We produced strategic-managerial map. According to assessment of resource capability, we extracted proper indicators and effective environmental factors in  Jazmoorian Strategic Planning. strategic map based on resources and environmental factors. Finally judging by strategic-managerial plans for achieving strategies was done. Results show that by using  native management with protection approach by co-ownership local communities in management processes can be suggested such as best management style at the time of drought and water crisis. Dam construction with bubble size: 4.4 and coordinates (1.3,6.5), population with bubble size and coordinates (0.3,8.3), drilling well with bubble size and coordinates (0.3,8.3) and most importantly, land use changing with bubble size 6.5 and coordinates (1.3,9.8), has the highest strategic fit.

In this study, the effects of hydro-geomorphology factors on the water quality changes of Siminehrood River and the process of these changes were studied at the different spatial and temporal scales. Data related to physical, chemical and hydrological parameters during 2003-2013 were received from the regional water organization of West Azarbaijan province and its seasonal average was calculated for each station. The related maps were extracted using GIS software. Then, the process of changing water quality during different seasons was studied for each station and the relationship between variables and their significance level was achieved by Pearson correlation test and SPSS software. Finally, Schueller and Wilcox diagrams were traced during each station and each season using Chemistry software for assessing the type and chemical quality of river water for drinking water and agricultural purposes. The quality of Kavlan station water during spring with amounts TDS (174.9), EC (269.1) and the concentration of chloride and sulfate ions (0.7) as the most favorable and Miandoab station during summer with amounts TDS (359.3), EC (529.3) and the concentration of chloride and sulfate ions (3.7) were introduced as the most critical spatial and temporal periods, respectively. In all research stations, the decrease of river water quality as the increase of EC, TDS and the concentration of chloride and sulfate ions had a direct and meaningful correlation with the discharge variable. In Siminehrood basin, the physical characteristics of the basin and hydro-geomorphology factors play a role in the presence or lack of pollution sources and seasonal-spatial changes of water quality. According to Schueller classification, Siminehrood River water is in a good and quite tasteless category in terms of drinking water. Also, in Wilcox diagram, all the stations are related to the C2S1 class for each season and have a slightly salty quality suitable for agricultural purposes.