امكان‌سنجي وتعيين اولويت مسيرهاي انتقال آب ازكارون به دشت ايذه به روش تاپسيس

Feasibility and priority route to transfer water from the Karun River to theizeh plain TOPSIS method

محدوديت منابع آبي در برخي نقاط وعدم توازن ريزش‌هاي جوي ازنظر زماني و مكاني ازيك‌طرف و افزايش مصرف آب از طرف ديگر سبب شده است كه بسياري از مناطق كشور با مشكل كم‌آبي مواجه باشند. از گذشته تابه‌حال همواره يكي از راه‌هاي تامين آب ، انتقال آب از حوضه‌هاي پرآب‌تر به مناطقي است كه با مشكل كم‌آبي مواجه هستند. حوضه كارون با بيش از 100زير حوضه يكي از حوضه‌هاي تامين آب مناطق خشك مجاور خود است . طبق تقسيمات كشوري3 زير حوضه از كارون در شهرستان ايذه قرار دارد.اما بااين‌وجود دشت ايذه بافاصله كمتر از 30كيلومتر از رودخانه كارون با مشكل كم‌آبي درزمينه كشاورزي و مصارف شهري مواجه است. در اين مقاله سعي شده تا با بررسي پتانسيل‌هاي كشاورزي وطبيعي شهرستان ايذه همچنين بررسي محدوديت‌هاي آبي دشت ايذه ، شرايط انتقال آب از رودخانه كارون در بخش جاري در حوضه ده شيخ به حوضه ايذه بررسي و با استفاده از نرم افزارهاي جغرافيايي ، نقشه هاي توپوگرافي ورقومي ، ارتفاعي اطلاعات مورد نياز جمع آوري وسپس به روش تاپسيس مسيرهاي ممكن براي انتقال آب بر اساس شرايط توپوگرافي ،شيب منطقه ،ارتفاع و فاصله نقاط برداشت آب از دشت ايذه ،طول تونل‌هاي احتمالي در مسير خط لوله و همچنين دسترسي به جاده اولويت‌گذاري شده و درنهايت مناسب‌ترين مسير انتقال آب تعيين گرديد كه در بررسي هاي انجام شده درنهايت از چهار مسير منتخب كه موردبررسي قرار گرفت ، مسير شماره 2 واقع در حوضه ده شيخ در شمال دشت ايذه كه از موقعيت جغرافيايي"13 ʹ48 °49 طول جغرافيايي و"31 ʹ08 °32عرض جغرافيايي شروع و نهايتاً در نقطه طول جغرافيايي "21 ʹ47 °49 و عرض جغرافيايي "45 ʹ58 °31 به پايان مي‌رسد ازنظر اولويت‌هاي تعريف‌شده در مدل تاپسيس براي اين تحقيق ، مناسب‌ترين مسير براي انتقال آب ازرود كارون به دشت ايذه است .

Extended Abstract Introduction Than ever to transfer water from a basin full of water to shallow areas have always been done.Karun catchment basins full of water from water sources in arid regions of Iran that is your neighbor Izeh Plain farmers and is one of the most talented centers in the basin and is located near the Karun River.However, due to the limited underground water resources, population growth and recent droughts and water shortage problems facedand transfer of water from the Karun-ize Plain is one way to fix this problem.This study aims to investigate the natural situation izehPossible routes for the transfer of water from the region Karun best course of four selected route based on TOPSIS method is adopted. Methodology This analytical method was based on field observations of the data required using GIS software, as well as topographic maps 1/50000 digital elevation map of Iran (DEM) was used. Results and discussion For the feasibility of transferring water from the Karun-izeh Plain Due to the natural conditions of the region enclosed by the Prairie Highlands Zagros Mountains and a height difference of 300 meters Webster plains and river water transfer project, given that it is at least possible cost In order to supply a given area must be considered in comparing methods have Roads to achieve the goal, resulting in the most cost-effective selection.Considering the possibilities of this material needs to evaluate the feasibility of different pathways for the transfer of water from the Karun River in the city-izeh 840 The average height of this research was to determine the plains with an average height of 840 meters above sea level height criterion was plain and then, using digital elevation maps of the area all along the river from the dam height from 3 to martyr Abbaspour Dam examined if the river is so high that the ground had to be determined.In this study, four points are obtained, the highest elevation along the Karun River has beenThen, using a map (DEM) software Arc map mash of all paths from the start point and end fields were examined and most short-haul routes along the length of the altitudes as water barrier in the way that slope as well as the area was chosen for each point in a direction determined by the specific circumstances.In the next step to select the most appropriate route TOPSIS method is applied to the data of each path and the path of natural conditions and favorable priority has been determined.TOPSIS method is applied to the four directions of the highest points of elevation river begins Pipeline cross from the most favorable terms than its surrounding areas have been identified for the study and evaluation of fixed parameters of the four directions wereThe first indicator is the high point of picking or choosing to transfer water to the letter (h) is shownDuring the index transmission path from the source to the flat plain that is deSelecting the transmission path using maps of Iran dem nearest mailbox is located in the lower elevations Mountain View is a clean appearance fay as well as from the plains is about average height is selected Water transmission pipeline along the same letters (pl) will be displayed. The third indicator to determine the priority transmission path length of the tunnel is probable route of transmission over the tunnel with letters (lt) is shownThe fourth route calculation parameters affecting the slope of the pipe is the average slope Trailhead or the location of water as well as the different slope than plain water may exist along the transmission path is and the letter (S) is shown. The method of calculating the index of V along the water pipeline which does not have access to the road with the letter (R) is shown. The specific coefficients for each of the parameters are defined according to their importance on TOPSIS method was applied to the data index Clearwater as the best option to transfer water from the four routes were introduce. Conclusion According to studies on topographic maps and digital elevation izeh region Karun River flowing in the basin water transfer in the vicinity of Sheikh plain four way possible is izeh the TOPSIS method was evaluated in four directions with regard to the criteria defined. According to Weber, the results of TOPSIS method is applied to the data obtained in this study route No. 2, located in the northern lowland basin Sheikh izeh the geographical location "13 ʹ48 °49 longitude and" 31 ʹ08 ° 32 starting latitude and longitude points eventually "21 ʹ47 ° 49 Longitude" 45 ʹ58 ° 31 ends, a izeh plain water is the first priority for transfer .Izeh Plain basin and adjacent ten-Sheikh since they are and the selected route for the transfer of water from a distance of over 24 kilometers to the 5/3 km from the need to have tunnel and a height of about 70 meters the water is higher than the average height of the plain It seems Compared to other ways of positively indicators have been closer to the ideal path and economic standpoint and reducing costs are more affordable than other routes and because water transfer route number 2 priority than other routes and is suitable.