This paper analyses the possibilities of improving the precision of, and obtaining better, drainage density (Dd) input data for the Erosion Potential Method (EPM). This method is used for erosion ...assessments in karst areas that are characterised by torrential watercourses. The analysis is conducted in the Dubračina catchment in Croatia. Four different methodologies are used to derive a Dd map. The approaches use different assumptions and allow different spatial variability. The first two are commonly applied in the EPM. The Dd in the first case scenario corresponds to very low Dd and is homogenous throughout the entire catchment. In the second case, Dd is calculated on the sub-catchment level and varies from very low to medium. The third and fourth case scenarios provide the most spatially variant maps. The output of the third case is the actual Dd based on a topographic map, and the fourth potential Dd is based on a river network map derived from a Lidar digital elevation model. The third and fourth case scenarios provide better spatial variability for the Dd parameter, and both case scenarios are considered appropriate input data for the EPM and an improvement of the accuracy and precision of the EPM.
In recent decades, various methods for erosion intensity and sediment production assessment have been developed. The necessity for better model performance has led to the more frequent application of ...the method sensitivity and uncertainty assessments in order to decrease errors that arise from the model concept and its main assumptions. The analysis presented in this paper refers to the application of the Gavrilović method (Erosion Potential Method), an empirical and semi-quantitative method that can estimate the amount of sediment production and sediment transport as well as the erosion intensity and indicate the areas potentially threatened by erosion. The emphasis in this paper is given upon the method sensitivity analysis that has not previously been conducted for the Gavrilović method. The sensitivity analysis was conducted for fourteen different parameters included in the method, all in relation to different model outputs. Each parameter was perceived and discussed individually in relation to its effect upon the method outputs, and ranked into categories depending on their influence on one or more model outputs. The objective of the analysis was to explore the constraints of the Gavrilović method and the method response to changes deriving from the each individual parameter in an attempt to provide a better understanding of the method, the weight and the contribution of each parameter in the overall method. The parameters that could potentially be used in future research, for method modification and calibration in areas with different catchment characteristics (e.g. climate, geological, etc.) were identified. The most sensitive model parameters resulting from conducted sensitivity analysis for the Gavrilović method are also those considered to be significant in the scientific literature on erosion. The Gavrilović method sensitivity analysis has been done on a case study for the Dubracina catchment area, Croatia.
The main focus in this article is given on the erosion potential method (EPM) modification. The aim was to provide a seasonal assessment, in addition to annual erosion assessment for the case study ...Dubračina catchment, Croatia. Seasonal assessment of erosion processes in the catchment will contribute to planning strategies that would benefit local community and enable the more appropriate and timely definition of erosion mitigation and protection measures. Original EPM was used for erosion intensity and sediment production assessment for two time periods: the past and the present time. The overall classification of erosion intensity categorises the erosion processes in the catchment as slight, although excessive erosion processes are present in some areas. For the method modification purpose, three main model parameters were changed: precipitation, soil protection coefficient and temperature. The greatest soil loss was found to occur in autumn, followed by summer, spring and winter period. The results indicated good erosion intensity and soil loss approximation obtained with the modified EPM and 13% soil loss deviation in comparison to the results obtained with original EPM. The erosion intensity, land cover map for both the present time and summer season and soil surface change over a two-year time period were verified.
This paper examines the performance of the Erosion Potential Method (EPM or Gavrilović) and the model response to input data variations caused by choosing different sources of information for the ...same parameter. The research presented addresses the input data uncertainty via an analysis of the two model input parameters (the soil protection coefficient and the soil erodibility coefficient). The parameter uncertainty analysis is performed following two different approaches: uncertainty analyses of both the selected sample size and the entire population are conducted for an erosion assessment case study of the Dubračina River catchment, Croatia. The analysis indicated that, when changing the data source, significant changes in the model outcome values can occur (up to 47% for this case study). Future method modifications should consider the mitigation of these two parameters by potentially making structural changes in the model and therefore moderating the effect.
This paper analyses the possibilities to derive drainage density map, a parameter used within Erosion Potential Method (EPM, Gavrilović), for the Dubračina catchment study area in better detail and ...precision. EPM method is used for erosion assessment in the karstic areas characterized by torrential rivers. In this paper, three different methodologies were used to derive drainage density map each using different assumptions and allowing different spatial variability. The third case of drainage density map provides most realistic spatial variance of the drainage density parameter with lower values along the edges of the catchment and higher values concentrated along the river and tributary intersections.
A detailed review of application of the Gavrilović method (erosion potential method) and its modifications, with a focus on the potential surface erosion, is presented in the paper, together with the ...guidelines and recommendations for future analysis and research as needed for physical planning and urban development. The Gavrilović method results are based on the source of information, expert experience, accuracy, and level of detail of the model input and output data. For further analysis, the authors propose investigation of additional sources of erosion materials, such as construction plots in expanding urban areas.
U radu je obrazložena složena problematika donošenja odluka o prometnoj infrastrukturi u urbanim područjima te analizirana primjena metoda višekriterijske analize u tom procesu. Analizom je ...obuhvaćeno planiranje, projektiranje, održavanje i rekonstrukcija prometne infrastrukture. Autori u radu daju zaključke o mogućnostima, prednostima i ograničenjima primjene metoda višekriterijske analize u cilju unapređenja kvalitete donošenja odluka o prometnoj infrastrukturi u urbanim područjima.
Gavrilovićeva metoda (metoda potencijala erozije) jest semikvantitativna metoda koja omogućava procjenu intenziteta erozije, ukupne godišnje produkcije erozijskog nanosa i godišnje količine ...transportiranoga vučenog i suspendiranog erozijskog nanosa. U ovome radu dan je detaljan pregled primjene Gavrilovićeve metode i njezinih modifikacija, s fokusom na potencijalnu površinsku eroziju, kao i smjernice te preporuke za buduće analize i istraživanja neophodna za prostorno planiranje i urbani razvoj. Rezultati Gavrilovićeve metode uvjetovani su izvorom informacija, iskustvom stručnjaka, točnošću i razinom detalja ulaza i izlaza iz modela. Za buduće analize autori predlažu da se u obzir uzmu dodatni izvori erozijskog nanosa poput gradilišta u područjima urbanog razvoja.
The complex issue of making decisions on transport infrastructure in urban areas is considered in the paper, and the use of multicriteria-analysis in this process is analysed. The analysis covers ...planning, design, maintenance and rehabilitation of transport infrastructure. Authors present conclusions on the possibilities, advantages, and limitations of the use of multicriteria-analysis methods, with the purpose of improving quality of decision making regarding transport infrastructure in urban areas.
The complex issue of making decisions on transport infrastructure in urban areas is considered in the paper, and the use of multicriteria-analysis in this process is analysed. The analysis covers ...planning, design, maintenance and rehabilitation of transport infrastructure. Authors present conclusions on the possibilities, advantages, and limitations of the use of multicriteria-analysis methods, with the purpose of improving quality of decision making regarding transport infrastructure in urban areas.
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