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Stability Causes of Ab-Ask Landslide Dam in Haraz River

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Stability Causes of Ab-Ask Landslide Dam in Haraz River Archive of SID Journal of Geotechnical Geology Zahedan Branch, Islamic azad University Vol.12 (2016), No.1(51-63) Zahedan Branch, geo-tech.iauzah.ac.ir Islamic Azad University Stability Causes of Ab-Ask landslide dam in Haraz river Abbas Kangi Department of Geology, Shahrood Branch, Islamic Azad University, Shahrood, Iran Email: [email protected] Abstract So far so many landslide dams have developed along the steep slopes of Haraz valley, and the failure of some of them have claimed many lives and caused huge damages. Damavand eruption, the event of huge earthquakes and rapid snow-melting, are the most important causes of landslide dam development. In 1999, along with rapid snow-melting in May, Ab-Ask landslide took place in the south of Damavand volcano. This landslide berried Pashang village, destroyed 450 m of Tehran-Amol main road and blocked Haraz river. This landslide dam is 20 m above the river level and its lake is at most of 700 m length, 300m width and 15m depth. Just like rapid-rock slide, this landslide occurred in the beddings of early Jurassic shale, sandstone and coals. The surface of the rupture formed along the bedding plane. Immediately after the main landslide and river's block- age there was a rock avalanche when a huge mass of big Travertine rocks fell on the northern part of the land- slide. These boulders are haphazardly placed in the mud from the landslide and this has turned the northern landslide mass to be strongly firm. Following the landslide dam being filled, water overflew from the northern part of the landslide mass. Presence of Travertine boulders in this part has prevented the landslide dam from ero- sion during the past 17 years. The flow of Haraz river's overtopping water over the Ab-Ask landslide mass and water seepage through different parts have all created a dangerous situation. Nevertheless, Ab-Ask landslide dam's resistance in such hard a situation has made for a uniquely gorgeous instance of landslide dams. Keywords: Landslide dam, Rock slide, Geomorphometric parameters, Ab-Ask landslide, Haraz river. Journal of Geotechnical Geology, Vol.12(2016), No.1 51 www.SID.ir Archive of SID Kangi:Stability Causes of Ab-Ask landslide dam in Haraz river 1. Introduction the Northern Apennines. Landslide dams usually form in mountainous areas of After the study of Costa and Schuster (1988), some high terrain (Costa and Schuster, 1988), where there statistical conclusions of landslide dams became a are proper conditions for preparation (high hills- matter of primary importance. Korup (2002) slope gradients and discontinuities such as bedding, reviewed the literature and focused recent findings on faults, joints) and triggering (precipitation, snowmelt, the geomorphic and hydrologic aspects of the forma- earthquakes) factors of slope failure (Korup, 2002). tion, failure and geomorphic impacts of landslide Most of the landslide-dammed lakes (about 90% of dams. Ermini and Casagli (2002) and Korup (2004) 390) examined worldwide relate to landslides trig- proposed some indices for the prediction potential for gered by either rainstorms/snowmelts or earthquakes landslide dam stability. They applied the indexes to (Schuster, 1993; Costa and Schuster, 1991). present- the selected data from the Apennines in Italy, various ed a data compilation for 436 historical landslide worldwide sites and available New Zealand landslide dams and associated landslide-dammed lakes that dammed lakes, respectively. Weidinger (2004) sug- have been recorded throughout the world. In addi- gested the Block Size Stability Diagram for classifi- tion, some regional works attempting to collect and cation for natural rock blockages and the life span of classify data on the present and historical landslide their dammed lakes due to work out the stability con- dams were carried out in different parts of the world ditions of 20 landslide dams in the Indian and Nepal (Casagli and Ermini 1999; Chai et al. 2000). Himalayas as well as two in Chine. Temporary or Geomorphometric parameters of 15 large landslide permanent landslide dams gradually receive more dams were recently documented by (Hanisch and attention and awareness with increasing population Söder, 2000; ICIMOD, 2000). and land use pressure in steep terrains (Korup 2002). Failure of landslide dams usually resulted in cata- Landslide dams are quite rare in Iran and they have strophic downstream flooding causing loss of life, not been inclusively studied so far. Along the Haraz housing and infrastructures. The Raikhot landslide river, located in the south and east of Damavand vol- dam of some 200-300 m in height which impounded cano things are different. Along this river 3 dams a 65-km-long lake on the Indus River, Pakistan col- have emerged so far, two of which have been destruc- lapsed in 1841 (Mason 1929). This phenomenon is ted (Fig. 1). The first natural dam developed 40,000 referred to be the largest damming by landslide and years ago, when Damavand erupted and Lar river (a resulting catastrophic flood that has been document- sub-branch of Haraz river) was blocked with the lava ed in the world (Shroder 1998). (Uromeihy 2000). This natural dam is 150 meters Landslide dams, which are both complex and com- high and the deposits of which are visible on the river posite (Korup 2002), are significant geomorphic banks this dam was destructed after some time. The forms due to their temporary existence in front of second natural dam is a landslide one, which formed impoundment lakes. Geomorphic forms and process- 180 years ago near Mobarak-abad village (Pedrami es related with landslide dam formation, stability and 1987). This landslide dam developed when failure have been extensively explored. The grain Damavand earthquake 0f 7.1 magnitude in Richter size distribution of the debris material forming a dam scale took place in 1830. The triggering earthquakes influences the overall strength of a landslide dam due had probably been the starting point of this landslide to the erosional processes that can cause to failures dam. Mobarak-abad landslide dam was destructed by overtopping or piping (Casagli and Ermini 1999). after some time and caused some damages. Ab-ask Casagli et al. (2003) applied different techniques to landslide dam is the third natural dam in Haraz river the analysis of landslide dams more than 60 cases in which developed near Pashang village in May 1999, 52 Journal of Geotechnical Geology, Vol.12(2016), No.1 www.SID.ir Archive of SID Kangi:Stability Causes of Ab-Ask landslide dam in Haraz river when there was a rapid snow-melting. This incident and 100 km across, running along the southern side blocked the river and developed a natural dam in the of the Caspian Sea. Several summits are .4000 m in river path. The damages this landslide caused were altitude. Damavand, a dormant volcano, reaches burying the Pashang village, destruction of 450 5671 m (Fig. 1). meters of Tehran-Amol main road, destruction of The central Alborz constitute the highest peaks along four stores, a restaurant and 15 electricity posts. This the range. The region exposes a rough morphology research studied the characteristics and the causes of with steep slopes and peaks. Main morphological Ab-ask landslide plus the relation between landslide units shaped under the control of the structural ele- mass and landslide-dammed lake as well as the ments (main folds, faults) in the region trend to the threats resulting from the related failure. NW-SE. The central Alborz are drained by the Haraz River, which is the most significant fluvial system in 2. General characteristics of the area the region. Deep incision forms v-shaped valleys The study area is located in the central sector of the characterised by deep and steep slope in this drainage Alborz mountains. The Alborz range of northern Iran system. Large and deep-seated landslides are preva- is a region of active deformation within the broad lent on these slopes. The relief along these slopes Arabia-Eurasia collision zone. The range is also an reaches up to 2400 m. excellent example of coeval strike-slip and compres- The climate of the study area is a transition of the sional deformation, and as such can be an analogue Caspian Sea and the continental central Iranian cli- for inactive fold and thrust belts thought to involve a matic regions with warm summers (average daily component of oblique shortening (transpressional July temperature 18.3 °C) and cold winters (average deformation) (Allen et al. 2003; Zanchi et al. 2006; daily January temperature -11.8 °C). The annual Hassanzadeh et al. 2006). It is roughly 600 km long average air temperature is 4.5°C, the precipitation is Figure 1. Location map of the 408 study area with distributions of landslide dams in Haraz river, modified from Allen et al. (2003). Journal of Geotechnical Geology, Vol.12(2016), No.1 53 www.SID.ir Archive of SID Kangi:Stability Causes of Ab-Ask landslide dam in Haraz river Figure 2. Simplified geological map and landslide inventory map of the study area. 553 mm during the year (SMLD 2005). The Reyneh- region (Pourghasemi et al. 2003) (Fig. 3). Larigan meteorological station is located at 5 km the The Ab-Ask landslide occurred in the Shemshak for- northeast of the Ab-Ask landslide mation (Jsh.) that dip moderately downslope. Detail Ab-Ask landslide region consists of two Early lithological descriptions of this sequence with 1025 Jurassic and Quaternary sedimentary collections. m thickens are made by (Assereto 1966). It consists From Stratigraphic view point, these deposits include of alternating thick and thin bedded, poorly sorted, Shemshak Formation and Quaternary travertine. gray quartzose sandstone and immature, ammonite Shemshak Formation (Jsh.), which is related to Early bearing graywackes inter-bedded with fossil shales, Jurassic, is composed of extremely folded alternating siltstone, and thin limestones, that have coal seams coal shale and sandstone.
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