Rainfall Erosivity and Extreme Precipitation Months � a Comparison Between the Regions of Lovech and Kardzhali (Bulgaria)

Nikolova, Nina; Matev, Simeon; Pophristov, Vulcho

doi:10.5593/sgem2021/3.1/s13.64

Cited by 6 publications

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“…An increase in extreme precipitation months (dry and wet) was observed for all the investigated stations. Similar results were obtained by Nikolova et al [51] and Svetozarevic and Nikolova [52] for the north and northwest parts of Bulgaria. This is also in line with the conclusions of the IPCC [53] about an increase in extreme events of a different nature at the same places.…”

Section: Extremely Wet and Extremely Dry Monthssupporting

confidence: 91%

Annual and Seasonal Characteristics of Rainfall Erosivity in the Eastern Rhodopes (Bulgaria)

Nikolova,

Stefanova

et al. 2024

Atmosphere

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Rainfall, with its intensity, duration, and seasonal distribution, is among the main factors causing soil erosion, which is a widespread environmental problem in Bulgaria. Rainfall erosivity shows the potential of precipitation to generate erosion processes and is an essential indicator of the climate vulnerability of a region. This paper aims to evaluate rainfall erosivity in a part of the Eastern Rhodopes Mountains, an area that is characterised by high-intensity erosion processes and high erosion risk. Local peculiarities of rainfall erosivity were revealed by the calculation of some precipitation indices based on the monthly precipitation for the period 2000–2021, such as the precipitation concentration index (PCI), Angot precipitation index, Fournier index (FI), and modified Fournier index (MFI). The analysis of the extremely wet and extremely dry months at the annual and seasonal (October–March and April–September) levels was performed to evaluate the susceptibility to erosion. The results from the study show that rainfall erosivity in the studied area varies from low to moderate in the northern part of the study area and from high to very high in the south. According to the MFI, high and very high erosivities have been observed mainly since 2012. The erosivity increases from north to south, to the area with a complex relief, where the combination of orography and atmospheric circulation make favourable conditions for the occurrence of extreme precipitation. The analyses of the calculated indices show that the precipitations in most of the studied area generally have from a low to a moderate erosivity, but this does not exclude the occurrence of cases with high and very high erosivities, which are characteristic of recent years and are related to the increase in annual precipitations and extreme precipitation months. The results of this study can contribute to the development and implementation of measures and preventive activities for the reduction and possible elimination of the negative impacts of extreme precipitation.

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Section: Extremely Wet and Extremely Dry Monthssupporting

confidence: 91%

Annual and Seasonal Characteristics of Rainfall Erosivity in the Eastern Rhodopes (Bulgaria)

Nikolova,

Stefanova

et al. 2024

Atmosphere

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“…Viewed in a wider territorial scope, for the region of the Eastern Rhodopes the maximum of precipitation is in December-January and the minimum is in August (Topliiski, 2006). Based on Modified Furnier Index (MFI), Nikolova, Matev, and Pophristov (2021) state that in the area of Kardzhali (located near the study catchment), moderate or high erosivity of precipitation has been observed for the most of the years in the last decade.…”

Section: Study Areamentioning

confidence: 99%

“…Better understanding of the debris floods and debris flows, and evaluation of the caused topographic change, can be achieved through consistent monitoring of the affected area. In this relation, the application of geospatial technologies provides great opportunities (Aigner et al, 2021;Blasone et al, 2014;Dhote et al, 2022;Keilig et al, 2018;Loye et al, 2016;Nikolova, Matev, & Pophristov, 2021). The application of terrestrial laser scanning (TLS) allows rapid collection of high-accuracy data used for building high-resolution terrain models and the evaluation of geomorphic change by consecutive scanning in different periods (Li et al, 2021;Picco et al, 2013;Rainato et al, 2013;Schürch et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The area of interest is a part of the river Damdere catchment, located in southern Bulgaria (the Eastern Rhodopes Mountains). Due to the natural conditions of the region (intensive rainfall, rapid snowmelt, and loose sediments), the area is highly susceptible to hydrogeomorphological hazards like debris flows, debris floods, floods, and landslides (Bruchev et al, 2001;Dobrev at al., 2013;Nikolova, Matev, & Pophristov, 2021). Despite the high susceptibility to hazardous events, there is no regular monitoring in this area, which increases a natural disaster risk.…”

Section: Introductionmentioning

confidence: 99%

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Geoinformation technologies in the evaluation of short-term geomorphic change: An example of Damdere debris flood area (Bulgaria)

Nikolova

Kamburov

2022

J GEOGR INST CVIJIC

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A debris flood is a hazardous hydrogeomorphic process that can change the topographic surface in a short time due to a high streamflow and a large volume of sediment transport. Large areas of the Eastern Rhodopes Mountains (Bulgaria) are susceptible to erosion, debris flows, and debris floods due to loose earth masses, rare vegetation, and alternating dry and wet periods with extreme rainfall. The study area is located in the lower part of the river Damdere catchment and covers the area around the check dam. Studying the geomorphic changes of the debris flood areas can provide information about the behavior of the event, and contribute to the development of mitigation measures. In the current research, the data are obtained using terrestrial laser scanning (TLS) during two campaigns (in October 2019 and August 2021). After processing the raw TLS data, two pairs of ground point clouds have been obtained- for the area immediately before the check dam and for the one after the dam. To evaluate the changes in the topographic surface, two approaches are applied: (1) measuring the distance between the successive point clouds (M3C2 algorithm) and (2) measuring the differences between the digital terrain models in geographic information system environment (DoD method). Both approaches have shown similar results and indicated active hydrogeomorphic processes. The relatively large volume of deposition after the check dam is an indicator for the decrease in the retaining capacity of the check dam, which is a prerequisite for the increase of a flood risk.

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“…The physical-geographic features and socio-economic factors in Bulgaria make the country vulnerable to the impact of climate change. Besides an increase in average temperatures, an important feature in recent years is the increase in the number of extremely rainy months over the years (Velev, 2010;Nikolova et al, 2021). With regard to mountainous topography, these extreme rainfall events significantly increase the risk of triggering landslides and rockfalls.…”

Section: Introductionmentioning

confidence: 99%

Influence of precipitation on landslide activity in Southwestern Bulgaria in the context of climate change

Ivanov,

Ivanova

2023

Eng. Geol. and Hydrogeol.

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The article analyzes the annual precipitation in the region of Southwest Bulgaria for the period 1991-2021 and the relationship between precipitation and the activation of landslides in the region. For this purpose, publicly available materials from the website of Geozashtita EOOD – Pernik (http://gz-pernik.mrrb.government.bg/landslide/) and from the website https://www.stringmeteo.com/ were used. The increased intensity of rainfall in some months is also the reason for the increase in the number of new landslides, which often creates significant problems for the operation and maintenance of the Bulgarian transport infrastructure. The main results of the study show that during the analyzed period there was an increase in months with extreme precipitation, and this is largely related to the global changes in the Earth's climate. The presented results provide an opportunity for conducting further studies linking climate change with the development of hazardous geological processes, and the negative impact of these phenomena on the road infrastructure emphasizes the need to develop dynamic models for obtaining information in real time.

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Rainfall Erosivity and Extreme Precipitation Months � a Comparison Between the Regions of Lovech and Kardzhali (Bulgaria)

Cited by 6 publications

References 0 publications

Annual and Seasonal Characteristics of Rainfall Erosivity in the Eastern Rhodopes (Bulgaria)

Annual and Seasonal Characteristics of Rainfall Erosivity in the Eastern Rhodopes (Bulgaria)

Geoinformation technologies in the evaluation of short-term geomorphic change: An example of Damdere debris flood area (Bulgaria)

Influence of precipitation on landslide activity in Southwestern Bulgaria in the context of climate change

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