Debris flows and debris floods occurrence in the Ribnishka River watershed (southern slopes of Ograzhden Mountain)

Dotseva, Zornitsa; Vangelov, Dian; Gerdjikov, Ianko

doi:10.52215/rev.bgs.2021.82.3.165

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Зачестилите случаи на активизиране на поройните дерета в България (Vasilev, Kenderova, 1997, 2002Dobrev, Georgieva, 2010;Kenderova et al, 2014;Dotseva et al, 2014;Dotseva et al, 2021;Nikolova et al, 2018;Krenchev et al, 2021;Gerdjikov et al, 2022, Dobrev et al, 2023 повдигат въпроси за промени в климатичните условия, за реакцията на средата към тях, за адекватността на мерките за защита и управленските подходи при проява на подобни ситуации.…”

Section: въведениеunclassified

Geomorphological study of the debris flow events in the Harsovska River (Blagoevgradska Bistritsa catchment), observed within 2019-2023

Kenderova,

Rachev,

Baltakova

2024

Eng. Geol. and Hydrogeol.

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Debris flow events in the Blagoevgradska Bistritsa catchment (SW Bulgaria) become more frequent in the past few years. To localize the debris source along the tributary system, the Harsovska River is chosen in this study. During the observation period a torrential event was registered in June 2023. The synoptic situation, which caused the flood, is re-analyzed and also geomorphological research is made for depositional landforms in the river channel for the period 2019-2023. In the study, the alluvial sediments are defined by grain size and also by morphoscopic study of pebble-sized grains. During the field research, two critical flood-risk sites are pointed, located in the Harsovo hamlet. The data about past debris flow events are collected from residents of Harsovo with interviews regarding their experience in this issue. In the period of the study, the main part of debris nourishment in Harsovska catchment is provided by the tributary Marulevska River, where active mass movement processes are registered. However, the alluvial profiles of both rivers – Marulevska and Harsovska, showed an alternation of coarser and finer materials, resulting of turbulent and calm discharge. Such periodical change in the sedimentary environment of the two compound rivers demonstrates their unsteady torrential character. Regarding the fortification activities in this area, at the moment some new forestation has been noticed. Still, the species, used to fortify the river banks are not suitable for the climate and hydrological regime of the region. The channel fortifications, built in the middle of the 20th century, currently are not maintained properly, which puts under threat of future debris flow events the settlements and infrastructure along this catchment.

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Section: въведениеunclassified

Geomorphological study of the debris flow events in the Harsovska River (Blagoevgradska Bistritsa catchment), observed within 2019-2023

Kenderova,

Rachev,

Baltakova

2024

Eng. Geol. and Hydrogeol.

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“…Изчисленията на морфометричните и статистическите параметри в ГИС среда се извършват с голяма точност, което позволява значително по-добро прогнозиране и моделиране на хидроложките и геоморфоложките процеси, както и превенцията срещу рискови природни процеси, като наводнения, селеви потоци, свлачища и др. През последните години, подобни изследвания са извършени от редица автори (Baltakova et al, 2018;Krenchev, Hristova, 2019;Krenchev, Kenderova, 2019;Stoycheva, Krenchev, 2021;Bozhkov, 2021Bozhkov, , 2022Dotseva et al, 2021;Nikolova et al, 2021Nikolova et al, , 2022, което доведе до натрупването на значителна база от данни за отделни водосбори на територията на България. Това позволява да бъдат направени значително по-добри сравнителни анализи и качествени характеристики на морфометричните параметри за отделни речни басейни.…”

Section: въведениеunclassified

Morphometric analysis of the drainage network in the Parvenetska river basin, the Western Rhodopes Mountains

Krenchev

2023

Rev. Bulg. Geol. Soc.

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The aim of this study is to analyze selected morphometric properties of drainage network in the Parvenetska river basin, the northwestern Rhodope Mountains. In this regard, the watershed of the main river was divided into seven sub-basins. For each of them, the following linear and areal morphometric parameters were considered: area and shape of the catchment, slopes, drainage network length, drainage density, stream frequency, bifurcation ratio, Meltonʼs index, hypsometric integral, etc. The morphometric analysis can be used for creating of hydrological and geomorphological models for natural hazards and for better planning of sustainable use of water resources in the area.

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“…Галата, гр. Варна при явлението от 2014 г., седиментни скали от южните склонове на Стара планина, гнайси по склоновете на Огражден (Dotseva, 2018;Dotseva et al, 2014Dotseva et al, , 1019Dotseva et al, , 2021 и др.…”

Section: въведениеunclassified

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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Debris flows and debris floods occurrence in the Ribnishka River watershed (southern slopes of Ograzhden Mountain)

Cited by 5 publications

References 5 publications

Geomorphological study of the debris flow events in the Harsovska River (Blagoevgradska Bistritsa catchment), observed within 2019-2023

Geomorphological study of the debris flow events in the Harsovska River (Blagoevgradska Bistritsa catchment), observed within 2019-2023

Morphometric analysis of the drainage network in the Parvenetska river basin, the Western Rhodopes Mountains

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

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