Morphometric analysis of debris flows basins in the Eastern Rhodopes (Bulgaria) using geospatial technologies

Nikolova, Valentina; Kamburov, Asparuh; Rizova, Radostina

doi:10.1007/s11069-020-04301-4

Cited by 19 publications

(12 citation statements)

References 22 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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“…Melton ratio Location Jackson et al (1987) ----------------0.25 to 0.30 Alberta, Canada Slaymaker (1990) 0.4 to 7 ----------------British Columbia, Canada Marchi et al (1993) 0.20 to 14 ------------0.49 to 1.74 Italian Alps, Italy Despite having very similar mean values for weathering-limited and transport-limited basins, the latter has a higher value (2.06 km) in watersheds evaluated by Jakob (1996), similar to the FN, FS, and MD sites, which may favor the recurrence of the processes at these sites. In Europe, values are more similar to those of the TW and GW sites, with values ranging from 0.16 to 0.82 km in Bulgaria (Nikolova et al 2020) and from 0.20 to 1.42 km in Italy (Portilla et al 2010). Considering climate zones, values in FN, FS, and MD are above 75% of the values for Temperate zones, while values in GW and TW are above the median but under 75% of the sample (Fig.…”

Section: Basin Relief (Km)mentioning

confidence: 63%

“…As a gravity-induced process, an angle of 25° is suggested by many authors as the minimum slope to initiate debris flows (Costa 1984, VanDine 1996, Takahashi 2007). The Br may influence the intensity and reach of the debris flow (Nikolova et al 2020). The Rr indicates the ruggedness of the watershed, which has been related to the production and availability of sediments.…”

Section: Morphometric Parametersmentioning

confidence: 99%

“…The morphometric evaluation of watersheds affected by debris flows has been used as an important tool for understanding features that may contribute to debris flow occurrence. Many studies evaluate debris flow occurrences in North America and Europe, including studies carried out by Scally et al (2001, 2010), Jakob (1996, and Slaymaker (1990) in different areas of British Columbia, Canada; Cenderelli and Steven Kite (1998), Gabet and Bookter (2008), Kovanen and Slaymaker (2008), Welsh andDavies (2011), andWilford et al (2004) in the USA; Portilla et al (2010) in the Pyrenees Mountains, Spain; Dotseva and Gerdjikov (2020) on Stara Platina Mountain and Nikolova et al (2020) in the Eastern Rhodopes, Bulgaria; and Ilinca (2021) in the Carpathians, Romania. Most of these studies evaluate the debris flow process under a specific climatic condition, in this case, a temperate environment, which has very specific characteristics in comparison to a tropical environment.…”

Section: Introductionmentioning

confidence: 99%

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Differences in the occurrence of debris flows in tropical and temperate environments: field observations and geomorphologic characteristics in Serra do Mar (Brazil) and British Columbia (Canada)

et al. 2022

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Debris flows are among the most destructive types of mass movements throughout the world and are not restricted to certain climate zones or geological environments. In opposite corners of the American continent, Canada and Brazil have experienced several historic debris flows.As part of a one-year international exchange program, the lead author compared morphological evidence related to debris flows and the morphometry of watersheds at sites in Canada and Brazil, with the ultimate goal of improving the understanding of debris flows in Brazil. Field surveys carried out in both areas in 2019 and 2020 permitted observation of the debris-flow signatures, as well as the physical aspects of the surrounding areas and morphometric mapping of watersheds. Both areas exhibit similar typical features of debris flows, and the morphometric results indicate differences that may influence the recurrence of events at the sites in Canada as compared to Brazil due to their higher values for the parameters area > 25° (A25), relief ratio (Rr), and Melton ratio (Mr) at the Canadian sites; however, this dataset is limited. Compared to results in the literature from around the world, values of morphometric parameters at Brazilian sites are within the ranges observed in other tropical climates.

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“…Geomorphometry is a quantitative land surface analysis science that could be applied to compute land surface characteristics (for example slope, aspect, topographic wetness index, and so on) and objects (such as a watershed line, cirque, alluvial fan, drainage network, and so on) (Beheshti Javid et al, 2018; Hengl & Evans, 2009). Analysing basin morphometry and delineating watershed are important in river basin studies because it provides essential information about the drainage networks (Abdeta et al, 2020), topographic factors (Nikolova et al, 2021), geology (Ghosh et al, 2020), and climatic (Gebremeskel & Kebede, 2018) features of the basin. As a consequence, numerous researchers across the world have been determining the morphometric properties of basins in respect of better understand the physical aspects of their research regions and obtain thorough information concerning them.…”

Section: Introductionmentioning

confidence: 99%

Comparisons of Watershed Delineation of River Network Representation and Morphometric Analysis in Karnaphuli River Basin, Chittagong, Bangladesh: A study with Different Digital Elevation Model (DEM)

Roy

Chowdhury

Talukdar

et al. 2022

Preprint

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The present study aimed to delineate robust watershed boundary and extract its morphometric parameters in Karnaphuli watershed, Bangladesh using different types of digital elevation models (DEMs). Two DEMs, such as Shuttle Radar Topographic Mission (SRTM) and the Terra Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), were utilized to delineate watershed boundary and evaluate several morphometric characteristics. From the findings, it is revealed that there is a visual difference between the data sets as ASTER has a larger watershed area than SRTM. Also, regarding stream order, there are actually 1 to 6 orders of stream, so there are so many small, medium and main channels of the river, where the drainage density for SRTM (spatial resolution: 30m) and ASTER (spatial resolution: 30m) is 0.52 km/km2 and 0.51 km/km2. The bifurcation ratio ranges from 1.94 and 2.45 for SRTM and ASTER, respectively, representing the influence of geological structure as well as suffering more structural disturbances. The form factor denotes the study area's elongated shape. The entire dimension of the stream and the extent of the watershed imply that the mean annual rainfall discharge is moderate. The watershed has rather high denudation rates, according to the basin relief. The watershed's drainage density is low, demonstrating that infiltration is more important. This study may help policymakers to take decisions on the Karnaphuli River on conservation of the river stream and flow path, which will ultimately enrich the river ecology and other vegetation cover in Chittagong, Bangladesh.

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Morphometric analysis of debris flows basins in the Eastern Rhodopes (Bulgaria) using geospatial technologies

Cited by 19 publications

References 22 publications

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

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

Differences in the occurrence of debris flows in tropical and temperate environments: field observations and geomorphologic characteristics in Serra do Mar (Brazil) and British Columbia (Canada)

Comparisons of Watershed Delineation of River Network Representation and Morphometric Analysis in Karnaphuli River Basin, Chittagong, Bangladesh: A study with Different Digital Elevation Model (DEM)

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