Given that floods continue to cause yearly significant worldwide human and material damages, flood risk mitigation is a key issue and a permanent challenge in developing policies and strategies at various spatial scal...Given that floods continue to cause yearly significant worldwide human and material damages, flood risk mitigation is a key issue and a permanent challenge in developing policies and strategies at various spatial scales. Therefore, a basic phase is elaborating hazard and flood risk maps, documents which are an essential support for flood risk management. The aim of this paper is to develop an approach that allows for the identification of flash-flood and flood-prone susceptible areas based on computing and mapping of two indices： FFPI （Flash-Flood Potential Index） and FPI （Flooding Potential Index）. These indices are obtained by integrating in a GIS environment several geographical variables which control runoff（in the case of the FFPI） and favour flooding （in the case of the FPI）. The methodology was applied in the upper （mountainous） and middle （hilly） catchment of the Prahova River, a densely populated and socioeconomically well-developed area which has been affected repeatedly by water-related hazards over the past decades. The resulting maps showing the spatialization of the FFPI and FPI allow for the identification of areas with high susceptibility to flash- floods and flooding. This approach can provide useful mapped information, especially for areas （generally large） where there are no flood/hazard risk maps. Moreover, the FFPI and FPI maps can constitute a preliminary step for flood risk and vulnerability assessment.展开更多
This article identifies and analyzes the effects of human pressures on the river systems,landscape,flow regime,and water quality in the Bucharest region,the largest urbanized area in Romania.The analyses focused on fo...This article identifies and analyzes the effects of human pressures on the river systems,landscape,flow regime,and water quality in the Bucharest region,the largest urbanized area in Romania.The analyses focused on four streams crossing the Bucharest region,namely the Dâmboviţa,Colentina,Argeş,and Sabar rivers.Our approach relied especially on three types of information:(1)spatial data;(2)hydrological data sets;and(3)water quality data.We made a diachronic analysis of the available maps and ran classic statistical analysis of the data sets,as well as trend analysis.At the same time,we compared the flows in natural(reconstituted)and modified(current)regimes.The results showed that the stream system and its associated landscapes have considerably changed due to several engineering works(reservoirs,dams,channelization works,diversion canals,water intakes,etc.).Under these circumstances,the flow regime suffered changes that differed among the rivers.Thus,the multiannual discharges of the Argeşand Dâmboviţa rivers did not exhibit significant changes,but only mitigated the monthly discharge variability.In the case of Sabar and Colentina,a significant increase of the annual and monthly discharges was identified,due to the water transferred from the neighboring rivers.Water quality worsened,especially on the lower courses of the Dâmboviţa and Argeşrivers,degrading the states and health of the aquatic ecosystems in the study region.展开更多
文摘Given that floods continue to cause yearly significant worldwide human and material damages, flood risk mitigation is a key issue and a permanent challenge in developing policies and strategies at various spatial scales. Therefore, a basic phase is elaborating hazard and flood risk maps, documents which are an essential support for flood risk management. The aim of this paper is to develop an approach that allows for the identification of flash-flood and flood-prone susceptible areas based on computing and mapping of two indices： FFPI （Flash-Flood Potential Index） and FPI （Flooding Potential Index）. These indices are obtained by integrating in a GIS environment several geographical variables which control runoff（in the case of the FFPI） and favour flooding （in the case of the FPI）. The methodology was applied in the upper （mountainous） and middle （hilly） catchment of the Prahova River, a densely populated and socioeconomically well-developed area which has been affected repeatedly by water-related hazards over the past decades. The resulting maps showing the spatialization of the FFPI and FPI allow for the identification of areas with high susceptibility to flash- floods and flooding. This approach can provide useful mapped information, especially for areas （generally large） where there are no flood/hazard risk maps. Moreover, the FFPI and FPI maps can constitute a preliminary step for flood risk and vulnerability assessment.
文摘This article identifies and analyzes the effects of human pressures on the river systems,landscape,flow regime,and water quality in the Bucharest region,the largest urbanized area in Romania.The analyses focused on four streams crossing the Bucharest region,namely the Dâmboviţa,Colentina,Argeş,and Sabar rivers.Our approach relied especially on three types of information:(1)spatial data;(2)hydrological data sets;and(3)water quality data.We made a diachronic analysis of the available maps and ran classic statistical analysis of the data sets,as well as trend analysis.At the same time,we compared the flows in natural(reconstituted)and modified(current)regimes.The results showed that the stream system and its associated landscapes have considerably changed due to several engineering works(reservoirs,dams,channelization works,diversion canals,water intakes,etc.).Under these circumstances,the flow regime suffered changes that differed among the rivers.Thus,the multiannual discharges of the Argeşand Dâmboviţa rivers did not exhibit significant changes,but only mitigated the monthly discharge variability.In the case of Sabar and Colentina,a significant increase of the annual and monthly discharges was identified,due to the water transferred from the neighboring rivers.Water quality worsened,especially on the lower courses of the Dâmboviţa and Argeşrivers,degrading the states and health of the aquatic ecosystems in the study region.
