نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

شناخت منابع تغذیه چشمه‌های کارستی مهم استان کهگیلویه و بویراحمد با استفاده از ایزوتوپ‌های پایدار اکسیژن 18 و دوتریم

نویسندگان
دانشگاه شهید چمران اهواز
چکیده
چشمه‌های کارستی بلقیس و سیاه ازجمله چشمه‌های پرآب استان کهگیلویه و بویراحمد هستند که از آهک‌های آسماری تاقدیس لار تخلیه می‌گردند. سطح بیرون زده آهک‌های آسماری تاقدیس متناسب با حجم آب تخلیه‌شده از این چشمه‌ها نیست. بر اساس بررسی‌های بیلان اجمالی و هیدروگراف تخلیه چشمه‌ها، منابع آب مهمی در منطقه موردمطالعه وجود دارد (ازجمله تاقدیس نیل) که می‌تواند در امر تغذیه چشمه‌های یادشده دخالت داشته باشد. بنابراین، جهت ارزیابی این موضوع، محتوی ایزوتوپ‌های پایدار اکسیژن (18O) و هیدروژن (2H) تمامی منابع آب موجود در منطقه هدف (تخلیه) و در منطقه تغذیه برای دو دوره ( اردیبهشت 1402 و اردیبهشت 1403) تعیین گردید. سپس، با استفاده از این نتایج ایزوتوپی و خط آب جوی محلی (LMWL)، به بررسی منشأ تغذیه چشمه‌های منطقه هدف پرداخته شد و ارتفاع منطقه تغذیه و سهم تغذیه احتمالی این چشمه‌ها از منابع آب موجود در منطقه تعیین گردید. نتایج نشان داد که ارتفاع منطقه تغذیه چشمه‌های منطقه هدف با ارتفاع آن‌ها در تاقدیس کارستی نیل مطابقت دارد. بااین‌حال، سهم آب دریافتی چشمه سیاه در مقایسه با آب دریافتی چشمه بلقیس از تاقدیس نیل، کمی بیشتراست.
کلیدواژه‌ها

عنوان مقاله English

Identifying the recharge sources of important karst springs in Kohgiluyeh and BoyerAhmad provinces using stable isotopes of oxygen 18 and deuterium

نویسندگان English

Nasrollah Kalantari
Sajjad Pourakbari
Taleb Moradieghad
University of Shahid Chamran
چکیده English

The karst springs of Belqis and Siah are among the abundant springs of Kohgiluyeh and BoyerAhmad provinces that are discharged from the Asmari limestones of the Lar anticline. The protruding surface of the Asmari limestones of the anticline is not proportional to the volume of water discharged from these springs. Based on the summary balance and hydrograph of the springs discharge, there are important water sources in the study area (including the Nile anticline) that can interfere with the recharge of the mentioned springs. Therefore, to evaluate this issue, the value of stable isotopes of oxygen (18O) and hydrogen (2H) of all water sources in the target area (discharge) and in the recharge area was determined for two periods (May 2023 and May 2024). Then, using these isotopic results and the local watershed line (LMWL), the source of recharge of the springs in the target area was investigated, and the height of the recharge area and the possible recharge share of these springs from the water sources in the area were determined. The results showed that the elevation of the recharge area of the springs in the target area corresponds to their elevation in the Nile karst anticline. However, the share of water received by the Siah Spring is slightly higher compared to the water received by the Belqis Spring from the Nile anticline.

کلیدواژه‌ها English

Belqis
Siah
recharge Resources
Hydrograph
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