تعیین اهمیت نسبی پارامترهای دو مدل هیدرولوژیکی یکپارچه با استفاده از روش های موریس، سوبول و شاخص آنتروپی

نوع مقاله : مقاله کامل علمی پژوهشی

نویسندگان

1 دانشگاه گنبد کاووس

2 استادیار- دانشگاه گنبد

3 دانشگاه گنبد کاووس- هیات علمی

چکیده

ont-family: TimesNewRomanPSMT;font-sizدر طی دهههای اخیر با افزایش قابلیت مدلسازی با کامپیوتر شاهد افزایش پیچیدگی و تنوع مدلهای هیدرولوژیکی بودهایم. با افزایش پیچیدگی مدل، تعداد پارامترهای مدل زیاد شده که این مسأله باعث افزایش احتمال بیشبرازشی و سخت شدن شناسایی پارامترها و ساختار مدل میشود. بدینمنظور با استفاده از آنالیز حساسیت پارامترهای مهم که به نوعی رفتار مدل را کنترل میکنند شناسایی شده و سهم هر یک از پارامترها در عدم قطعیت خروجی مدل تعیین میشود. روشهای مختلفی برای آنالیز حساسیت پارامترها و ورودیهای مدلهای مختلف وجود دارد که آنها را به دو دسته موضعی و سراسری تقسیمبندی میکنند. در حالیکه در روشهای موضعی تغییرات خروجی مدل در حالتی که سایر پارامترها ثابت بوده و فقط یکی از پارامترها تغییر میکند بررسی میشود. روشهای سراسری قادر بوده آنالیز حساسیت را برای کل دامنه پارامترهای مدل اجرا کرده و همچنین میتوانند اثرات متقابل بین پارامترها و غیرخطی بودن را نیز در نظر بگیرند. در این پژوهش کارایی سه روش آنالیز حساسیت شامل روشهای موریس، سوبول و شاخص آنتروپی در آنالیز حساسیت پارامترها و ورودیهای مدلهای هیدرلوژیکی
TOPMODELو

کلیدواژه‌ها


عنوان مقاله [English]

Assessing the relative importance of two lump hydrological models parameters using Morris, Sobol and Entropy index methods

نویسندگان [English]

  • Abolhasan Fathabadi 1
  • Hamed Rouhani 2
  • Seyed Morteza Seyedian 3
2 Assitat prof
چکیده [English]

The sensitivity and interaction analysis based onSobol, Morris screen
and Entropy methods were applied. The Morris method has been proposed as a screening
method to identify a subset of inputs that have the greatest influence on the outputs.Sobol SA is a global, variance-based method that attributes variance in the model output to individual
parameters and their interactions.Mutual entropy analysis is a sensitivity analysis method in
which the mutual entropy of two variables is regarded as the correlative extent between these
two variables. The distribution character of data (X, Y) can be expressed by contingency tables.
The HBV model and TOPMODEL are used as a test problem. There are thirteen and nine
parameters in the HBV model and TOPMODEL models, respectively. In each model, samples
of the model parameter space are obtained using a latin-hypercube. The convergence analysis
has been performed by increasing the number of simulations until there was no significant
change of the sensitivity measure. In addition, the three SA methods are evaluated and
compared in terms of convergence, the related evolution of the parameter ranking results and
required computation cost.

کلیدواژه‌ها [English]

  • Sensitivity analysis
  • Entropy
  • Sobol
  • Morris
  • Hydrological model
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