The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
François Dubeau - One of the best experts on this subject based on the ideXlab platform.
-
Least squares fitting of the stage–discharge relationship using smooth models with curvilinear asymptotes
Hydrological Sciences Journal, 2015Co-Authors: Youness Mir, François DubeauAbstract:AbstractIn this paper we consider the problem of modelling the stage–discharge relationship by curve fitting using the least squares method. Our basic idea is to present new models which are more flexible and have the ability to model Phenomena with increasing or unchanging carrying capacity. The new models present a generalization of some sigmoid smooth models commonly used in practice. They are characterized by a curvilinear asymptote and may have several inflection points. The use of these models on six real datasets collected from the US Geological Survey’s website proves their performance and their ability to model Hydrological Phenomena. Editor D. Koutsoyiannis; Associate editor S. Yue
-
Modelling stage-discharge relationship with single inflection point non-linear functions
International Journal of Hydrology Science and Technology, 2012Co-Authors: François Dubeau, Youness Mir, Ali A. Assani, Alain ChalifourAbstract:The problem of using a non-linear function with only one inflection point for modelling Hydrological Phenomena is addressed. We present the examples of such functions and retain values of their parameters giving increasing function with one inflection point. For a set of data from one river, their least squares adjustments are compared for the stage-discharge relationship, namely the flow and the height of the water of a river. Finally we raise the problem of classifying rivers in terms of their best non-linear fitting model.
Youness Mir - One of the best experts on this subject based on the ideXlab platform.
-
Least squares fitting of the stage–discharge relationship using smooth models with curvilinear asymptotes
Hydrological Sciences Journal, 2015Co-Authors: Youness Mir, François DubeauAbstract:AbstractIn this paper we consider the problem of modelling the stage–discharge relationship by curve fitting using the least squares method. Our basic idea is to present new models which are more flexible and have the ability to model Phenomena with increasing or unchanging carrying capacity. The new models present a generalization of some sigmoid smooth models commonly used in practice. They are characterized by a curvilinear asymptote and may have several inflection points. The use of these models on six real datasets collected from the US Geological Survey’s website proves their performance and their ability to model Hydrological Phenomena. Editor D. Koutsoyiannis; Associate editor S. Yue
-
Modelling stage-discharge relationship with single inflection point non-linear functions
International Journal of Hydrology Science and Technology, 2012Co-Authors: François Dubeau, Youness Mir, Ali A. Assani, Alain ChalifourAbstract:The problem of using a non-linear function with only one inflection point for modelling Hydrological Phenomena is addressed. We present the examples of such functions and retain values of their parameters giving increasing function with one inflection point. For a set of data from one river, their least squares adjustments are compared for the stage-discharge relationship, namely the flow and the height of the water of a river. Finally we raise the problem of classifying rivers in terms of their best non-linear fitting model.
Stepan Zemtsov - One of the best experts on this subject based on the ideXlab platform.
-
Social risk and vulnerability assessment of the hazardous Hydrological Phenomena in Russia
2014Co-Authors: Stepan Zemtsov, Vyacheslav Baburin, Klaus P. Koltermann, Inna Krylenko, Natalia M. Yumina, Litvinov VladimirAbstract:Methods and results of social vulnerability and risk assessment are presented in the article. It is explored if modified methodology of the United Nations University (World risk index) can be used on different scale levels: regional, municipal and settlement. It was estimated that, despite the low value of the World risk index for Russia, southern coastal and mountain regions have high values of the risk index for Hydrological Phenomena because of higher frequency of the hazardous events, higher population density, and high social vulnerability. The Krasnodar region (in the south-western part of Russia) was chosen for a detailed analysis. A municipal risk index was developed, and municipal districts in the Kuban river mouth were identified as territories with the highest risk. For verification of the index results, the percentage of vulnerable people was estimated based on opinion polls. The results can be used in further risk calculation for other hazardous Phenomena.
-
SOCIAL RISK AND VULNERABILITY ASSESSMENT OF HAZARDOUS Hydrological Phenomena IN RUSSIA
GEOGRAPHY ENVIRONMENT SUSTAINABILITY, 2014Co-Authors: Stepan Zemtsov, Vyacheslav Baburin, Klaus P. Koltermann, Inna Krylenko, Natalia M. Yumina, Vladimir Yu. LitvinovAbstract:Methods and results of social vulnerability and risk assessment are presented in the article. It is explored if modified methodology of the United Nations University (World risk index) can be used on different scale levels: regional, municipal and settlement. It was estimated that, despite the low value of the World risk index for Russia, southern coastal and mountain regions have high values of the risk index for Hydrological Phenomena because of higher frequency of the hazardous events, higher population density, and high social vulnerability. The Krasnodar region (in the south-western part of Russia) was chosen for a detailed analysis. A municipal risk index was developed, and municipal districts in the Kuban river mouth were identified as territories with the highest risk. For verification of the index results, the percentage of vulnerable people was estimated based on opinion polls. The results can be used in further risk calculation for other hazardous Phenomena.
-
Social Risk and Vulnerability Assessment of the Hazardous Hydrological Phenomena in the Krasnodar Region of Russia
2014Co-Authors: Stepan Zemtsov, Vyacheslav Baburin, Klaus P. Koltermann, Inna Krylenko, Natalia M. Yumina, Vladimir Yu. LitvinovAbstract:Methods and results of social vulnerability and risk assessment are presented in the article. It is explored if modified methodology of the United Nations University (World risk index) can be used on different scale levels: regional, municipal and settlement. It was estimated that, despite the low value of the World risk index for Russia, southern coastal and mountain regions have high values of the risk index for Hydrological Phenomena because of higher frequency of the hazardous events, higher population density, and high social vulnerability. The Krasnodar region (in the south-western part of Russia) was chosen for a detailed analysis. A municipal risk index was developed, and municipal districts in the Kuban river mouth were identified as territories with the highest risk. For verification of the index results, the percentage of vulnerable people was estimated based on opinion polls. The results can be used in further risk calculation for other hazardous Phenomena.
-
Integrated assessment of socio-economic risks of dangerous Hydrological Phenomena in Russian coastal zones of the Baltic, the Azov and the Black Seas
European geosciences union general assembly, 2013Co-Authors: Vyacheslav Baburin, Inna Krylenko, Natalia M. Yumina, M. Goryachko, Stepan ZemtsovAbstract:In 2012, an integrated damage from floods in Russia was about 1 billion euros, floods have caused the death of over 200 people. It is one of the most pressing scientific topics, but most of the works devoted to natural risks assessment. The main purpose of this work is to estimate the influence of dangerous Hydrological Phenomena (e.g. floods, underflooding and surges) on society, using vulnerability and damage assessment techniques. The objectives are to examine domestic and foreign methodologies, to integrate them and to test on specific Russian territory. Foreign training was organized at UNU-EHS (Bonn, Germany). Three different methods were used for each stage of research.
Natalia M. Yumina - One of the best experts on this subject based on the ideXlab platform.
-
Integrated assessment of socio-economic risks of hazardous Hydrological Phenomena in Slavyansk municipal district
Natural Hazards, 2016Co-Authors: Stepan P. Zemtsov, Mariya D. Goryachko, Vyacheslav L. Baburin, Inna N. Krylenko, Natalia M. YuminaAbstract:In 2012, the damage costs of floods in Russia amounted to about €300m, and these floods have caused nearly 200 fatalities (Kotlyakov et al. in Reg Res Rus 3(1):32–39, 2013 ). Risk assessment is one of the most pressing scientific topics in Russia, but most of the works are devoted to natural hazards assessment. The purpose of this work is to estimate the influence of hazardous Hydrological Phenomena on society. The field research was conducted in the Slavyansk municipal district in the Krasnodar region (the south-western part of Russia), which is a highly populated coastal territory with a high frequency of hazardous Hydrological events. Modified methods of the Ministry of the Russian Federation for Affairs for Civil Defence, Emergencies and Elimination of Consequences of Natural Disasters (EMERCOM) were used for potential economic damage calculation. The paper did not only focus on direct, tangible risks, but also included social risk (i.e. risk to life and health). Social vulnerability has been calculated directly as a percentage of vulnerable people, estimated in opinion polls, while in many recent papers the social vulnerability index was calculated as a combination of several statistical indicators. The resulting percentage of vulnerable people was converted to numbers of potential victims. Finally, the social risk was expressed by financial indicators in terms of the cost of the value of statistical life lost (Mrozek and Taylor in J Policy Anal Manag 21(2):253–270, 2002 ; Viscusi and Aldy in J Risk Uncertain 27(1):5–76, 2003 ). Social risk can be underestimated in comparison with economic risk because of a low “value of life” in Russia (no life insurance, neglecting of basic safety rules, etc.) (Guriev in Myths of economics, Alpina Business Books, Moscow, 2009 ).
-
Social risk and vulnerability assessment of the hazardous Hydrological Phenomena in Russia
2014Co-Authors: Stepan Zemtsov, Vyacheslav Baburin, Klaus P. Koltermann, Inna Krylenko, Natalia M. Yumina, Litvinov VladimirAbstract:Methods and results of social vulnerability and risk assessment are presented in the article. It is explored if modified methodology of the United Nations University (World risk index) can be used on different scale levels: regional, municipal and settlement. It was estimated that, despite the low value of the World risk index for Russia, southern coastal and mountain regions have high values of the risk index for Hydrological Phenomena because of higher frequency of the hazardous events, higher population density, and high social vulnerability. The Krasnodar region (in the south-western part of Russia) was chosen for a detailed analysis. A municipal risk index was developed, and municipal districts in the Kuban river mouth were identified as territories with the highest risk. For verification of the index results, the percentage of vulnerable people was estimated based on opinion polls. The results can be used in further risk calculation for other hazardous Phenomena.
-
SOCIAL RISK AND VULNERABILITY ASSESSMENT OF HAZARDOUS Hydrological Phenomena IN RUSSIA
GEOGRAPHY ENVIRONMENT SUSTAINABILITY, 2014Co-Authors: Stepan Zemtsov, Vyacheslav Baburin, Klaus P. Koltermann, Inna Krylenko, Natalia M. Yumina, Vladimir Yu. LitvinovAbstract:Methods and results of social vulnerability and risk assessment are presented in the article. It is explored if modified methodology of the United Nations University (World risk index) can be used on different scale levels: regional, municipal and settlement. It was estimated that, despite the low value of the World risk index for Russia, southern coastal and mountain regions have high values of the risk index for Hydrological Phenomena because of higher frequency of the hazardous events, higher population density, and high social vulnerability. The Krasnodar region (in the south-western part of Russia) was chosen for a detailed analysis. A municipal risk index was developed, and municipal districts in the Kuban river mouth were identified as territories with the highest risk. For verification of the index results, the percentage of vulnerable people was estimated based on opinion polls. The results can be used in further risk calculation for other hazardous Phenomena.
-
Social Risk and Vulnerability Assessment of the Hazardous Hydrological Phenomena in the Krasnodar Region of Russia
2014Co-Authors: Stepan Zemtsov, Vyacheslav Baburin, Klaus P. Koltermann, Inna Krylenko, Natalia M. Yumina, Vladimir Yu. LitvinovAbstract:Methods and results of social vulnerability and risk assessment are presented in the article. It is explored if modified methodology of the United Nations University (World risk index) can be used on different scale levels: regional, municipal and settlement. It was estimated that, despite the low value of the World risk index for Russia, southern coastal and mountain regions have high values of the risk index for Hydrological Phenomena because of higher frequency of the hazardous events, higher population density, and high social vulnerability. The Krasnodar region (in the south-western part of Russia) was chosen for a detailed analysis. A municipal risk index was developed, and municipal districts in the Kuban river mouth were identified as territories with the highest risk. For verification of the index results, the percentage of vulnerable people was estimated based on opinion polls. The results can be used in further risk calculation for other hazardous Phenomena.
-
Integrated assessment of socio-economic risks of dangerous Hydrological Phenomena in Russian coastal zones of the Baltic, the Azov and the Black Seas
European geosciences union general assembly, 2013Co-Authors: Vyacheslav Baburin, Inna Krylenko, Natalia M. Yumina, M. Goryachko, Stepan ZemtsovAbstract:In 2012, an integrated damage from floods in Russia was about 1 billion euros, floods have caused the death of over 200 people. It is one of the most pressing scientific topics, but most of the works devoted to natural risks assessment. The main purpose of this work is to estimate the influence of dangerous Hydrological Phenomena (e.g. floods, underflooding and surges) on society, using vulnerability and damage assessment techniques. The objectives are to examine domestic and foreign methodologies, to integrate them and to test on specific Russian territory. Foreign training was organized at UNU-EHS (Bonn, Germany). Three different methods were used for each stage of research.
J. Tenhunen - One of the best experts on this subject based on the ideXlab platform.
-
Spatial and temporal predictions of soil moisture patterns and evaporative losses using TOPMODEL and the GASFLUX model for an Alaskan catchment
Hydrology and Earth System Sciences Discussions, 1998Co-Authors: P. F. Quinn, B. Ostendorf, K. Beven, J. TenhunenAbstract:By using topographic indices as derived from a Digital Terrain Models (DTM), it is possible to represent the heterogeneity within a landscape. This heterogeneity can reflect both long term evolutionary patterns seen in a landscape and the short term forcing of flow dynamics during storm events. By spatial analysis, the linkage between the geomorphological- Hydrological-plant physiological Phenomena can be examined. In this study, a direct link will be established between the topographically-driven Hydrological Phenomena and the eco-physiological response. The topographic distribution function of TOPMODEL is used to control the spatial and temporal flux of the channel flow and water table. The plant physiological model GAS-FLUX is used to give a spatially and temporally dissaggregated species-sensitive estimate of evapotranspiration flux. Evapotranspiration is sensitive to the vegetation phonology, to tundra community physiology and to the temperature regime. A simple linking of TOPMODEL and the GAS-FLUX model is applied to a summer snow-free period to the Imnavait catchment, Alaska (2.2 km2). A species-sensitive evapotranspiration model proved to give the highest quality results when validated against flow observations. Predicted dynamics of variable source area and the component Hydrological processes are illustrated.
