آنالیز حساسیت رفتار هیدرولیکی آبخوان دشت شیراز با استفاده از مدل PMWIN

نوع مقاله: مقاله پژوهشی

نویسندگان

1 مربی مهندسی عمران- سازه هیدرولیکی، مرکز آموزشی اردل، دانشگاه آزاد اسلامی، واحد شهرکرد

2 دانشیار بخش مهندسی راه و ساختمان ، دانشکده مهندسی، دانشگاه شیراز، شیراز

چکیده

در این تحقیق رفتار هیدرولیکی آبخوان دشت شیراز با مساحت حدود 300 کیلومتر مربع به‌کمک مدل PMWIN شبیه‌سازی گردید. در این مدل، زهکش‌های در حال احداث در این دشت نیز در نظر گرفته شد و پارامترهای مؤثر بر رفتار هیدرولیکی آبخوان مورد مطالعه قرار گرفت. اطلاعات بارندگی و تبخیر اندازه‌گیری شده در دشت، میزان تغذیه و تخلیه سفره از طریق قناتها و مسیر رودخانه خشک و چنارراهدار و همچنین میزان برداشت آب از چاهها و تغذیه آبخوان به‌علت فاضلاب برگشتی، در مدل منظور گردید. پس از واسنجی مدل، ضرایب هیدرودینامیکی دشت تعیین شد و حساسیت مدل نسبت به چهار پارامتر مهم مورد آنالیز قرار گرفت. نتایج حاصله بیانگر آن‌ است که مدل اولاً نسبت به میزان تغذیه و ثانیاً به هدایت هیدرولیکی حساس است. به‌طوری‌که تغییر کوچکی در این دو پارامتر می تواند تغییر فاحشی در توزیع بار هیدرولیکی در دشت ایجاد نماید. ضریب آبدهی ویژه آبخوان نیز در دامنه نوسانات فصلی سطح آب زیرزمینی تأثیر زیادی میگذارد ولی تأثیر ضریب رسانایی زهکش فقط محدود به ناحیه شعاع تأثیر زهکش میشود و در کل مدل تأثیر محسوسی ندارد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Sensitivity Analysis for Hydraulic Behavior of Shiraz Plain Aquifer Using PMWIN

نویسندگان [English]

  • Ahmad Reza karimipour 1
  • Gholam Reza Rakhshandehroo 2
1 Instructor of Civil and Hydraulic Structure, Ardal Training Center, Isalmic Azad University, Shahrekord Branch, Shahrekord, Iran
2 Assoc. Prof. of Civil Eng., Dept. of Eng., Shiraz University, Shiraz
چکیده [English]

In this study, hydraulic behavior of Shirazplain aquifer, with an area of ~300 km2, was simulated using PMWIN model. The performance of recently constructed drainage system in the plain was modeled and parameters affecting hydraulic behavior of the aquifer were analyzed. Measured rainfall and evaporation rates in the plain, recharge and discharge rates through the aqueducts, Khoshk and Chenar Rahdar rivers, as well as amount of water discharged from production wells and recharge due to returned wastewater were considered in the model. Plain hydrodynamic coefficients were estimated via calibration and sensitivity analysis of the model was performed for four important parameters. Results showed that the model is most sensitive to recharge rate and hydraulic conductivity, respectively, such that a small variation in these two parameters causes a dramatic change in hydraulic head distribution in the plain. Furthermore, specific yield coefficient influences the seasonal water level fluctuations, but the aqueducts conductance coefficient only affects the aqueduct radius of influence with little effect on the overall hydraulic behavior of the plain.
 

کلیدواژه‌ها [English]

  • Groundwater
  • Simulation
  • Shiraz Plain
  • PMWIN model
  • Sensitivity analysis
  • Effective Parameters
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