ارزيابي نوسانات سطح ایستابی در شبکه آبیاری و زهكشی رامشیر استان خوزستان
محورهای موضوعی : بهینه سازی مصرف آب
پروانه ظاهری عبده وند
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داود خدادادی دهکردی
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1 - دانش آموخته کارشناسی ارشد، گروه مهندسی آب، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
2 - استادیار، گروه مهندسی آب، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
کلید واژه: فاصله زهکشها, خروجی زهکش, چاهک مشاهدهای, سطح ایستابی.,
چکیده مقاله :
در طرحهاي زهکشي، ارزيابي عملکرد زهکشهاي زيرزميني در کنترل سطح ايستابي و شوري خاک از اهميت زيادي برخوردار است. در این مطالعه بررسي عملكرد زهكش‌هاي زيرزميني و نوسانات سطح ايستايي منطقه رامشیر استان خوزستان با هدف كنترل سطح ايستايي انجام گرفت. بدین منظور یک مزرعه (مزرعه E) با فواصل کارگذاری زهکشهای زیرزمینی 70 متری در منطقه مورد مطالعه، انتخاب شد. چاهك‌هاي مشاهده‌اي بر روي سه لوله زهكش و در فواصل 3/0، 8/0، 5/1، 5/2 و 15 متري از لترال و در حد وسط بين دو خط زهكش در چهار رديف (یک چهارم طول لترال، دو چهارم طول لترال، سه چهارم طول لترال و 25 متری از خروجی زهکش) نصب شدند. پس از حفر، احداث و تجهیز چاهکهای مشاهدهای، در سه نوبت آبیاری پس از یک روز از زمان آبیاری، اقدام به قرائت سطح ایستابی آب در چاهکها شد. با توجه به بررسی سطح ایستابی زهکشها و شاخص RGWD مشخص شد لترالهای موردنظر در مزرعه مورد مطالعه، در كنترل سطح ايستابي به خوبي عمل نموده‌اند.
In drainage plans, the performance evaluation of underground drains in controlling the water table level and soil salinity is very important. In this study, the performance of underground drainages and water table level fluctuations in the Ramshir region of Khuzestan province was investigated with the aim of controlling the water table level. For this purpose, a farm (Farm E) with 70-meter underground drain intervals was selected in the study area. Observation wells on three drainage pipes and at distances of 0.3, 0.8, 1.5, 2.5, and 15 meters from the lateral and in the middle between two drainage lines in four rows (a quarter of the lateral length, two-quarters of the lateral length, three-quarters of the lateral length and 25 meters from the drain outlet) were installed. After digging, constructing, and equipping the observation wells in three irrigation times, after passing one day of irrigation, the level of the water table in the wells was read. According to the investigation of the water table level of the drains and the RGWD index, it was found that the desired laterals in the studied farm have performed well in controlling the water table level.
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