مقایسه مدل‌های رگرسیون لجستیک و بیزین رگرسیون لجستیک به منظور پیش‌بینی مکانی حرکت‌های توده‌ای استان کردستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار گروه مرتع و آبخیزداری، دانشکدة منابع طبیعی، دانشگاه کردستان، سنندج.

2 دکترای ژئومورفولوژی، گروه ژئومورفولوژی، دانشکدة منابع طبیعی، دانشگاه کردستان، سنندج.

3 دکترای آبخیزداری، گروه مرتع و آبخیزداری، دانشکدة منابع طبیعی، دانشگاه کردستان، سنندج.

چکیده

هدف از انجام این پژوهش ارائه روش ترکیبی بیزین رگرسیون لجستیک و مقایسه کارایی آن با روش رگرسیون لجستیک به منظور تهیه نقشه پیش بینی مکانی وقوع حرکت­های توده­ای در استان کردستان می­باشد. در ابتدا، بر اساس مرور منابع 18 عامل تأثیرگذار بر وقوع حرکت­های توده­ای شامل: درجه شیب، جهت شیب، ارتفاع، انحنای معمولی شیب، انحنای عرضی شیب، انحنای طولی شیب، شاخص توان حمل جریان، شاخص نمناکی توپوگرافی، شاخص طول و زاویة شیب، لیتولوژی، بارش، کاربری ارضی، فاصله از گسل، تراکم گسل، فاصله از رودخانه، تراکم رودخانه، فاصله از جاده و تراکم جاده انتخاب شدند. سپس، در روش رگرسیون لجستیک (LR) بر اساس سطح معنی­داری آماری 7 عامل و در روش بیزین لجستیک رگرسیون (BLR) بر اساس شاخص Information Gain Ratio، 11 عامل به عنوان عوامل مؤثر انتخاب و جهتمدل­سازی به کار گرفته شدند. ارزیابی مدل­ها (داده­های تعلیمی و داده­های تست) توسط معیارهای Specificity، Sensitivity، Accuracy، درصد مساحت زیر منحنی ROC و ریشه میانگین مربعات خطا انجام شدند. نتایج ارزیابی مدل­های مورد استفاده در این تحقیق نشان داد که اختلاف معنی­داری در سطح 95 درصد بین کارایی و نقشه­های پیش بینی مکانی تهیه شده برای مناطق حساس به وقوع حرکت های توده­ای خاک با روش­های BLR و LR مشاهده نشد و می­توان از مدل BLR نیز به مانند مدل LR به عنوان یک مدل معیار استفاده نمود. لذا با روش LR حدود 26 درصد از مساحت استان کردستان در معرض حساسیت زیاد و خیلی زیاد به وقوع حرکت های توده ای(54 درصد مجموع حرکتهای توده ای) قرار دارد و با روش BLR حدود 33 درصد از مساحت استان کردستان در معرض حساسیت زیاد و خیلی زیاد به وقوع حرکت های توده ای (64 درصد مجموع حرکتهای توده ای) قرار دارد که نواحی غرب استان دارای پتانسیل بیشتری هستند.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison between Logistic Regression and Bayesian Logistic Regression for Spatial Prediction of Mass Movements in Kurdistan Province

نویسندگان [English]

  • kamran chapi 1
  • davod taleb poor 2
  • ataolah shirzadi 3
1 kordestan university
2 kordestan university
3 koedestan university
چکیده [English]

Introduction
Geomorphological hazards such as mass movements are one of the potentially harmful phenomena. Landslides as one of the most traditional earth movements involved all slope failures in which a mass of materials (soil and rock) moves down the slope due to decreasing of safety factor and overcoming of the destructive forces on the resistance forces on a slope.
Kurdistan province has been frequently exposed to mass movement hazards owing to its characteristics of topography, geomorphology, pedology, geology and climatology. Therefore, the objective of this study is 1) to prepare the spatial prediction map of mass movements for the Kurdistan province to manage the areas prone to the hazards and to use the map in the land use planning projects and development of the rural regions 2) to introduce the Bayesian logistic regression (BLR) ensemble and to compare its efficiency with the logistic regression (LR), and 3) to identify the most significant conditioning factors on mass movements occurrence in the Kurdistan province.
Methodology
Based on the literature review, 18 factors affecting landslide susceptibility were selected for modeling including slope degree, slope aspect, elevation above sea, curvature, profile curvature, plan curvature, stream power index, topographic wetness index, length-angle of slope, lithology, rainfall, land use, distance to fault, fault density, distance to stream, stream density, distance to road, and road density. A total of 895 mass movements in the Kurdistan province were divided into 70 % (626 locations) for modelling using training dataset and 30% (269 locations) to evaluate based on the validation dataset. Additionally, 626 locations were randomly selected as areas where mass movements have not occurred and they were classified into 70% and 30% for training and validation in modelling process. Based on the Information Gain Ratio index to modelling process, 7 factors were then applied to the LR method and 11 factors were used in the BLR method. The evaluation of models were performed using Specificity, Sensitivity, Accuracy, the area under the Receiver Operating Characteristic Curve (AUROC), and the Root Mean Square of Errors (RMSE) indices.
Result and discussion
According to the results of spatial prediction of mass movements by quantile approach, about 8.06% of the Kurdistan province area is very sensitive to mass movement occurrence using the LR model; while, the BLR model shows a sensitive area of about 12.46%.   
The majority of very sensitive and sensitive areas are located to the west of the province. These regions include Oramanat mountainous areas, Kosalan and Chelchama highlands, the Salvatabad Saddle (East of Sanandaj), the Morvarid Saddle (between Sanandaj and Kamyaran), The Khan Saddle (between Saghez and Baneh), and the Arez Saddle (between Sanandaj and Marivan).
In order to assess the spatial map accuracy of mass movement sensitive areas prediction, both training and validating datasets were used. The results showed that the area under the curve of SRC is 0.714 in LR based on training data, indicating that this approach has a potential of 71.4 percent to predict sensitive areas to mass movement. BLR showed a value of 0.672 using the same data which implies a potential of 67.2% for prediction of sensitive areas.
Based on the validating dataset, the area under the curve of PRC was 0.732 and 0.729 for LR and BLR, respectively. These results confirmed the accuracy of the maps prepared by both models; however, it should be noted that LR was slightly providing better results.
To analyze the probability of mass movement occurrence, the potential of the LR and BLR models were evaluated using Friedman test at 5% significant level. The test revealed that there is no significant difference between these two models and both are reasonably able to evaluate spatial prediction of mass movements.
Conclusion
The results showed that there is no significant difference (95% level of significance) between the efficiency and the susceptibility maps prepared by the two models for spatial predicting of landslide in the study area; therefore, the BLR model can be applied as an index model for the study area and other similar areas.
Therefore the hybrid model of Bayesian Logistic Regression has a high capability of identifying sensitive areas to mass movement such that it can be compared with previously successfully testes methods such as artificial neural network, fuzzy logic, decision tree algorithms (Naïve, Random Forest, Baes Forest, …).

کلیدواژه‌ها [English]

  • Landslide
  • Bayesian Theory
  • Logistic Regression
  • Kurdistan Province

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