نوع مقاله : مقاله پژوهشی
نویسندگان
1 پردیس ابوریحان دانشگاه تهران
2 دانشگاه تهران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
This study aims to compare the ability of dynamic artificial neural network (DANN) and
multivariate linear regression (LR) in forecasting monthly inflow to Shahcheraghi reservoir in
Semnan province, Iran. The input data consisted monthly flow discharge, precipitation, mean
temperature and snow cover area. Snow cover area was estimated using NOAA-AVHRR images,
based on thresholds in histograms of different phenomena in visible and thermal channels. Dynamic
artificial neural networks were determined with one hidden layer, Levenberg-Marquardt as training
function, and sigmoid as transfer function Moreover, five DANN and five LR models were run with
different input data and the results were compared. Root mean square (RMSE), mean bias error
(MBE), mean absolute relative error (MARE), maximum relative error (REmax) and R2 (coefficient
of determination) are the criteria that were used for models evaluation. The best result is gained
with three inputs (inflow discharge, precipitation and snow cover area) by DANN. Regarding linear
regression as a classic model in inflow forecasting, the improvement of the results by using DANN
was obvious. The REmax of the selected DANN model was almost 85% less than REmax of the
selected LR.
کلیدواژهها [English]