1دانشجوی دکتری هیدروژئولوژی، گروه زمین شناسی، دانشکدۀ علوم زمین، دانشگاه شهید چمران، اهواز
2استاد، گروه زمین شناسی، دانشکدۀ علوم زمین، دانشگاه شهید چمران، اهواز
چکیده
در دشت بهبهان طی چند سال اخیر، به‌دلیل مدیریت نامناسب برداشت از منابع آب سطحی و زیرزمینی، سطح ایستابی بالا آمده است و سبب بروز مشکلاتی همچون پدیدۀ آبگرفتگی در منطقۀ شهری شده است. از جمله عوامل تأثیرگذار در وقوع این پدیده، توسعۀ شبکههای آبیاری و زهکشی در سطح گستردهای از منطقۀ مطالعه‌شده است. برای ارزیابی این موضوع، از آمار درازمدت (سالهای آبی 1382ـ 1383 تا 1394ـ 1395) سطح آب زیرزمینی چاههای مشاهدهای و میزان آب ورودی به شبکههای آبیاری موجود در منطقه استفاده شد. با استفاده از این دادهها، هیدروگراف معرف، نقشههای هم‌عمق، هم‌تراز و نقشههای افت و خیز دشت بهبهان در قسمتهای مختلف آن بررسی شدند. نتایج نشان داد نوسانات سطح آب زیرزمینی دشت بهبهان و ذخیرۀ آن به آب ورودی از شبکههای آبیاری بستگی دارد و از میان شبکههای آبیاری منطقۀ مطالعه‌شده، شبکۀ بنهباشت در مقایسه با شبکههای آبیاری مارون جنوبی و شمالی کارکرد مؤثرتری را در تغذیۀ آبخوان دشت بهبهان و بالاآمدگی سطح آب زیرزمینی آن دارد.
Evaluation of irrigation networks in rising of groundwater levels, Behbahan plain case study
نویسندگان [English]
Hassan Daneshian1؛ Nasrallah Kalantari2
1PhD candidate Hydrogeology, Department of Geology, Faculty of Earth Sciences, Shahid Chamran University, Ahvaz, Iran
2Faculty of earth sciences, Shahid Chamran University, Ahvaz,Iran
چکیده [English]
In the past few years, due to inappropriate management of surface and groundwater resource exploitation in the Behbahan plain, the water table has risen and caused to some problems such as the phenomenon of flooding in the urban area. Development of irrigation and drainage networks in a wide zone of the study area is one of the most effective factors causing this phenomenon is. In order to evaluate this, the water level of the observation wells as well as the amount of input water to irrigation networks were investigated in a long-term hydrological period (since 2003-2004 to 2015-2016) in the region. Using these data, the representative hydrograph, the iso-depth contour, iso-piez contour, and fluctuation maps of Behbahan plain were investigated in different parts of it. The results showed that the fluctuations in groundwater level of Behbahan aquifer and its storage depend on the input water from the irrigation networks in the study area. Among the irrigation networks, Boneh-basht irrigation network has more effective role in feeding of Behbahan aquifer and rising groundwater level in comparison with the northern and southern Maroon irrigation networks.
کلیدواژه‌ها [English]
Behbahan plain, Irrigation networks, Rising of groundwater level, Flooding
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