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Evaluation and Slope Instability Hazard Zonation in Part of Tajan Basin, Sari, Iran, by Anbalagan Method



K. Solaimani, S. Mashari and S.R. Moosavi
 
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ABSTRACT

The aim of this study is an experimental investigation on landslide hazards in Tajan Basin and its increasing due to land use changing, deforesting, road and other construction. The main strategy for restricting the damage caused by the activity of landslides is to avoid these regions. To accomplish this, landslide zonation hazard map of the area is required. There are different methods for zoning of different regions in term of susceptibility to landslide. Because of geological conditions of the study area, Anbalagan method purposed to gain the results. For landslide hazards zonation map the required maps of slope, aspect, land use, lithology, structural lithology, ground water, landform and facet map prepared using GIS software of Arc view and Arc map related to Anbalagan method. For the accuracy evaluation of the used method landslide distribution map provided for the study area which has compared with the landslide zonation map. The results showed that the most of landslides are occurred in VHH zone (28%) and HH zone (55.5%) and the rest of them are occurred in MH zone, which have predicted by the mentioned method. The results of fieldwork performed in summer 2008 with the method of Anbalagan were used to assess slope failure.

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K. Solaimani, S. Mashari and S.R. Moosavi, 2009. Evaluation and Slope Instability Hazard Zonation in Part of Tajan Basin, Sari, Iran, by Anbalagan Method. Research Journal of Environmental Sciences, 3: 321-331.

DOI: 10.3923/rjes.2009.321.331

URL: https://scialert.net/abstract/?doi=rjes.2009.321.331
 

INTRODUCTION

Landslides are occurring frequently in northern part of Alborz in Mazandaran Province, Iran that results suffering to human and substantial economic and environmental losses. For that reason the hazard regions should be properly identified. The mass movements such as landslides cause annual costs in excess of 38x107 Euro in Iran (Feyznia et al., 2005). Therefore it has become increasingly important, to plan land use so that hazards are avoided and so that construction projects can be designed to limit slope failures. Anbalagan (1992) has produced landslide hazards map using weighting lithology, relation between construction and slope, slope, land use, vegetation cover and ground water conditions. This method has termed Landslide Hazard Evaluation Factor (LHEF). Anbalagan (1992) was used this LHEF method, to zonation of landslide hazards in Katcom-Ninita of India. This method is a numerical system which is related to the geology, roughness, land use, vegetation cover and ground water conditions. Landslides, as one of the major natural hazards, account each year for enormous property damage in terms of both direct and indirect costs. Landslides, defined as the movement of a mass of rock, debris or earth down a slope (Cruden, 1991). Landslides have caused large numbers of casualties and huge economic losses in mountainous areas of the world. The most disastrous landslides have claimed as many as 100,000 lives (Li and Wang, 1992). Li and Wang (1992) conservatively estimated that in China the number of deaths caused by landslides totaled more than 5000 during the 1951-1989 periods, resulting in an average of more than 125 deaths annually and annual economic losses of about US$ 500 million. More sophisticated assessments are involved AHP, bivariate, multivariate, logistics regression, fuzzy logic, artificial neural network etc., analysis (Carrara, 1983; Van Westen, 1997; Dai et al., 2001; Lee and Min, 2001; Ercanoglu and Gokceoglu, 2004; Lee et al., 2004; Komac, 2006). Remondo et al. (2008) and Zolfaghari and Heath (2008) have investigated on landslide hazard zonation using GIS-based method. Slope morphology, land use and bedrock lithology are also used in modeling of landslide susceptibility (Schmidt and Beyer, 2001; Baeza and Corominas, 2001; Gorsevski et al., 2006). These parameters can also give an idea of the mass movement runout, a parameter closely related to potential damage on properties and infrastructure (Chen and Lee, 2003). Also in Iran, Oroumiei and Aminizadeh (1998), Oroumiei and Safaei (1998), Keshavarz and Mehmoodi (2000), Emami and Elhami (2005), Rezaeimoghadam and Eghbal (2005), Khezri et al. (2006) and Haghshenas et al. (2007) by Anbalagan method was applied to landslide hazard zonation which seems be suitable for Iran watershed such as this study area.

Mass movement and landslide zonation dividing the area into specific and severed regions which are potentially measured hazards. This process based on natural characteristics and quantitative modeling (Karam and Mahmoodi, 2002). Empirical methods are generally simple and relatively easy to use and dat required in such method is usually general and readily available. Where a local historic landslide database is available, the empirical relationships can be readily developed. However, empirical methods can only provide a preliminary estimate of the profile of the travel path (Dai et al., 2001).

The aim of this research is recognizing and classifying the principal factor which causes landslide to find an appropriate solution for prediction and control the landslide occurrence in susceptible regions and assessment the susceptibility measure based on instability factor.

MATERIALS AND METHODS

Study Area
The study region covering 62.07 km2 is located on the South-Western part of Sari the capital of Mazandaran Province, Iran. Geographically is located in Tajan basin in the Northern Alborz range where is limited between 53° 0` 12" N to 53° 06` 34" N and 36° 20` 48" E to 36° 27` 50" E (Fig. 1). This study conducted in April 2008.

Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method
Fig. 1: Study area related to Mazandaran Province and Iran

Table 1: Limitation of each hazard class
Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method

Methodology
The choice of hazard assessment method is basically dependent on the scale of investigation. For regional scale analysis, where the land-use planning is of main concern, hazard assessment is in the form of determining landslide-prone areas. For assessing landslide hazard, different methodologies are proposed. They are mainly grouped as: qualitative and quantitative methods. Qualitative approaches based on the site-specific experience of experts with the susceptibility/hazard determined directly in the field or by combining different index maps. Quantitative methods are based on numerical expressions of the relationship between controlling factors and landslides. The product of qualitative methods is usually susceptibility maps that do not provide information about the probability of sliding (Anbalagan, 1992). Numerous methods are presented by the related studies in the field of landslide zonation which of them used for specific purpose and area. In our study area with Mediterranean climatic conditions and effective factors on landslide occurrence, Anbalagan method was selected to run the related factors in GIS environment. This is method based on result of combining the basic map that related to natural characteristic of land. In this method after overlaying of the basic map, the weights of class were determined. Then the landslide hazard zonation map was preparing. This method is based on a quantitative data which is weighting the required factor to preparing the landslide hazard zonation map or LHEF (Table 1). Based on final factor of hazard evaluation, hazard classes were determined. Following to the maps overlying it is possible to identify several types of very low, low, medium, high and very high landslide hazard classes (Solaimani, 2007).

Work Unit Map
The study area divided into 10 work unit using 1:25000 topography map and aerial photos. In this division, the work units were determined by topographic border, sub border, gullies and channels which have similar characteristics of slope (Solaimani et al., 2007). The work unit map is basic map that should be overlay on other maps, then entered its weights, finally, by summing the resulted weights, landslide hazard rate is determined in each of work unit.

Landslide Inventory Map
For the landslide mapping, at the first stage, geographical coordinates provided for IRS and ETM data, then, field verification of landside data using GPS and finally, landslide inventory map and digitization of data was completed in ArcGIS environment.

Factors Map
Using of different data such as 1:20000 aerial photographs, 1:25000 topography map, 1:100000 geology map, IRS and ETM images together produced factors map.

Slope
Slope is one of the major factors in model, which is main parameter of the slope stability analysis (Lee and Min, 2001). Because the slope angle is directly related to the landslides, it is frequently used in preparing landslide susceptibility maps (Ercanoglu et al., 2004; Lee et al., 2004; Lee, 2005; Yalcin, 2005, 2008). The slope map of the study area is divided to different slope categories based on Table 2.

Table 2: The weight of factors
Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method

Aspect
Such as slope, aspect is one of the important factors in preparing landslide susceptibility maps (Ercanoglu et al., 2004; Lee et al., 2004; Lee, 2005; Yalcin, 2008). The related parameters of aspect such as exposure to sunlight, drying winds, rainfall (degree of saturation) and discontinuities may control the occurrence of landslides (Suzen and Doyuran, 2004; Komac, 2006). Aspect degree are classified according to the aspect class as flat (-1°), North (315-360°, 0-45°), East (45-135°), South (135-225°) and West (225-315°).

Relative Relief
Based on the used model relative relief is an effective factor, due to its role in the rate and type of erosion (Ayalew et al., 2005; Dai et al., 2001) and also on land use changes (Gritzner et al., 2001). Relative relief of the study area is mapped using aerial photographs and topographic map.

Lithology
The main source of data related to the geomorphology of an area is its investigation by lithology properties (Dai et al., 2001). The study area contents M2.3 m.s.l, Plqc.s and Q2 formations. These types of lithology are very susceptible against landslide occurrence.

Fault
This factor is prepared from geology map which is used in numerous researches (Lee, 2005).

Land Use and Land Cover
Land use and land cover are play important role in instability of slope (Jakob, 2000; Anbalagan, 1992). With using IRS and ETM images, the land use map of the study area was produced and then their boundaries were determined in conformity with land use state. As a result of the evaluation, three different land cover are described including mixed of forest and garden, forests and croplands.

Ground Water
In the study area, this factor is determined using land use map, field verification and spring survey which is weighted based on Table 2.

Soil
This factor is important for zoning the landslide (Lee, 2005) which is obtained from 1:25000 soil maps for the study area with three different type of soil. According to the depth and drainage condition, this factor was weighted. After preparing of these maps using Table 2 each of them were weighted. Finally, using collecting the weights, the class weight of units was determined (Fig. 2).

RESULTS AND DISCUSSION

Using Table 2, each of factors were weighted, then by combining the layers of factors and comparing with work unit map, the weight of each work unit is determined (Table 3). Regarding to the Table 1, the study area divided into three class of landslide susceptibility; involve, very high hazard class, high hazard class and medium hazard class. Finally, the landslide zonation map was prepared (Fig. 2a-j).

For evaluation the accuracy of landslide zonation, this map is comparing with landslide inventory map; and the percent of landslide area in each class is calculated (Fig. 3). Then regarding to the ratio of landslide area percent to the hazard class area percent, determined that this model is suitable for the study area where the most of landslide are occurred in very high and high hazard classes.

Finally, to determine the importance of the used factors, the percent weight of each factor was calculated in each work unit from total weight of factors (Table 4). The gained result showed that lithology and soil are more importance in landslide occurrence. Then, roughness, land use, slope, ground water condition and structure are effective, respectively.

As mentioned lithology is more importance factor; which is the same with Komac (2006), Van Den Eeckhaut et al. (2006) and Kamp et al. (2008) and also, Yalcin (2008) achievements.

The study area is naturally susceptible to landslide occurrence; also Anbalagan method based on natural characteristics, therefore is suitable for zoning this area, that showed in Solaimani et al. (2007), Oroumiei and Safaei (1998), Oroumiei and Aminizadeh (1998) and Emami and Elhami (2005), also it can be recommended that this method is best model for landslide zonation of this area. This method should be performed by assistance of different experts in tectonic, climatology and hydrology, because this method requires to different factors measurements. Refer to former researches that performed in similar condition and other regions of country, this method is appropriate and in compare to other method, gave better results. Furthermore, the study area is very susceptible; therefore, the zone of low hazard and very low hazard not existed. Certainly in this method, road were not contributed, whereas observed in this field. Therefore, road in this area constructed carefully and not constructed in high hazard zone and very high hazard zone, so that with lowest long having most of usage. Furthermore, observed that construction the animal husbandry and site of inhumation garbage, caused landslide occurrence due to high susceptibility to landslide. Finally this zonation map is recommended to use for construction design and road in forest area such as Pahnehkola basin.

Table 3: The weights of work unit
Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method

Table 4: Weight of class to total weight of factor (%)
Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method

Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method
Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method
Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method
Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method
Fig. 2: Factors, work unit and zonation map

Image for - Evaluation and Slope Instability Hazard Zonation in Part of Tajan 
        Basin, Sari, Iran, by Anbalagan Method
Fig. 3: Comparing area of landslide (%) with area of hazard class (%)

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