Conceptual Model of Debris Flow Information System

Nikolova, Valentina; Златева, Пламена; Berov, Boyko; Kamburov, Asparuh; Velev, Dimiter

doi:10.1007/978-3-030-48939-7_13

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…The first exploration of debris flows in Bulgaria started at the beginning of the 20th century when in 1905 the Bureau of Strengthening of the Slopes and afforestation was opened in the town of Kazanlak (Central Bulgaria) (Popsavov, 2005). Most of the existing publications on debris flows in Bulgaria analyze mainly the geological and geomorphological features of these phenomena (Brouchev, Frangov, Varbanov, & Ivanov, 2001;Dobrev & Georgieva, 2010;Gerdjikov, Vangelov, & Glabadanidu, 2012;Nikolova, Kamburov, & Rizova, 2020;Nikolova, Zlateva, Berov, Kamburov, & Velev, 2020). According to Nikolova, Rachev, and Kenderova (2018), debris flows are compound event and this requires the analysis of various factors and prerequisites for their occurrence and manifestation.…”

Section: Introductionmentioning

confidence: 99%

Debris flows in Kresna Gorge (Bulgaria)-geomorphological characteristics and weather conditions

Krenchev

Kenderova

Matev

et al. 2021

J GEOGR INST CVIJIC

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Over the last decades, numerous extreme climate events such as extreme temperatures, droughts, heavy precipitation, and storms associated with climate change have been recorded in many countries, including Bulgaria. As a result, geomorphological hazards such as landslides, debris flows, mudflows, high-speed soil erosion, etc. often occur on the territory of the country. The debris flow is one of the most common hazardous processes in small catchments of the main river basins in Bulgaria. The Kresna Gorge located in the middle part of Struma River valley is a typical area with such processes which often cause the damages to the E79 international highway. The purpose of the present study is to characterize debris flows in Kresna Gorge (southwestern part of Bulgaria) by comparative analysis between the two events (occurred on May 24, 2009 and July 28, 2019). In order to achieve the aim of the study the geomorphological features and flow type of 2019 event were identified and the results were compared with the previous publications which investigated the event on May 24, 2009. In the present paper, the sediments and the type of transportation of the investigated event (July 2019) were determined by grain-size and clast-shape analysis. The impact of weather conditions on debris flow occurrence was shown by the analysis of the synoptic conditions on the day before the event. The results of the study bring to clarifying the geological-geomorphological and meteorological factors for the occurrence of debris flow and are important for geomorphological hazard management.

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Section: Introductionmentioning

confidence: 99%

Debris flows in Kresna Gorge (Bulgaria)-geomorphological characteristics and weather conditions

Krenchev

Kenderova

Matev

et al. 2021

J GEOGR INST CVIJIC

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Peculiarities of the materials involved in the debris flows in Kresna Gorge, Southwest Bulgaria

Dobrev¹,

Ivanov²,

Baltakova³

et al. 2023

Eng. Geol. and Hydrogeol.

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Debris flow events periodically occur in the northern part of the Kresna Gorge, SW Bulgaria. Most of them damage the infrastructure and block the traffic along the National Route E79. In the present paper, we analyze the physical properties of the materials involved in debris flow transportation and sedimentation. Samples taken from events in 2017 and 2021 were studied. Plasticity properties were found in the materials deposited in and near the alluvial fan. The plasticity index is up to 23.4% according to BDS EN ISO 17892-12. The particle size composition of the samples shows a predominance of gravelly sand and sandy gravel materials according to the BDS EN ISO 14688-2 standard. The samples taken from the transport zone are defined as gravel and less commonly as sandy gravel. The sand content in them is lower – from 5.3 to 48.5% (average 21.5%) than in the samples taken from the source area and accumulation zone, where the average values are 43.8% and 47.4%, respectively. In the accumulation zone, the quantity of sand content also increases – the average value is 14.1%, while in the source and transport zones it is 6.6% and 8.2%, respectively. The debris flows materials are polydisperse, with dominantly angular and subangular roundness. The coarser grains are accumulated within the stream channel. The finer grains (silty and clayey) are more common in the periphery of the accumulation zone (alluvial fan).

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Conceptual Model of Debris Flow Information System

Cited by 2 publications

References 12 publications

Debris flows in Kresna Gorge (Bulgaria)-geomorphological characteristics and weather conditions

Debris flows in Kresna Gorge (Bulgaria)-geomorphological characteristics and weather conditions

Peculiarities of the materials involved in the debris flows in Kresna Gorge, Southwest Bulgaria

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