The formation and deterioration landslide lake of Jaydar in south Lorestan province

Document Type : Original Article

Authors

1 geology,sciences,Bu Ali sina,Hamadan,Iran

2 Prof. of engineering geology, Bouali University

Abstract

Landslide-dammed lakes are a geological phenomenon that, despite of its beauty can be studied as a geologic hazard. Seymareh rock avalanche has created at least three dams and lake landslides in southwest Iran. Jaydar dam is a horseshoe-shaped landslide dam is composed from large rocky blocks. The length of the dam is more than 11,000 m and average height is 140 m from its bedrock. This dam is formed on the permanent Kashkan River in south ofPoldokhtar city and between the Sarab Jahangir and Baghe Jaydar villages. Due to the geometry dimensions and stability of the dam until now, it could be the oldest and largest rocky landslide dam in Iran. Jaydar Lake is the 2nd landslide lake in region, has a length of 36,000 m and an area of 65 Km2. The Jaydar Lake has expanded from the south of Poldokhtar city to Jolgeh Khalaj village on the Poldokhtar- Khorramabad road. The Present Research shows, that the formation and death of Jaydar Lake are in 4 stages. 1. Seymareh rock avalanche and formation the Jaydar landslide dam. 2. The closure of Kashkan River route 3. Formation of the landslide lake behind of dam and filling up to 740 meters above sea level (m.a.s.l). 4. Lake drainage through a valley (spillway) on bedrock in the northwest of the lake.4. Discharge of lake water by a solution channel (spillway) in the Gachsaran Formation (bedrock of The Jaydar Lake). ...

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