The soil samples were collected taking into account the land use in Songon area. The hydraulic conductivity (K) of soils was characterized in-situ when specific yield (Sy), pHw and concentrations of Cooper, Iron, Zinc...The soil samples were collected taking into account the land use in Songon area. The hydraulic conductivity (K) of soils was characterized in-situ when specific yield (Sy), pHw and concentrations of Cooper, Iron, Zinc, Cadmium, Chromium and Lead were measured in the laboratory. Pollution load indices (PLI) were calculated to evaluate the soil contamination levels. The soils were neutral and alkaline (6.7≤ pH ≤ 9.20), permeable (1.9 í 10-5?m·s-1?≤ K ≤ 8.2 í 10-4?m·s-1), with a high specific yield (13.33% ≤ Sy ≤ 33.33%) which can favor the pollutants transfer. The heavy metals (Fe, Cu, Zn, Cd, Cr and Pb) have very high concentrations in soils. The integrated pollution indices (PLI) indicate that almost 70% of Songon soils are moderately contaminated by the investigated heavy metals, with windows presenting high indices of pollution related to the intensive use of fertilizers and pesticides. The establishment of new boreholes in the Songon area should consider these heavy metals, so as to avoid the risk of groundwater pollution due to the physical properties of soils.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
基金the International Fund for Science(IFS),the University Agency for Francophonie(AUF)and the Romanian government for the EUGEN IONESCU fellowship and for their support.
文摘The soil samples were collected taking into account the land use in Songon area. The hydraulic conductivity (K) of soils was characterized in-situ when specific yield (Sy), pHw and concentrations of Cooper, Iron, Zinc, Cadmium, Chromium and Lead were measured in the laboratory. Pollution load indices (PLI) were calculated to evaluate the soil contamination levels. The soils were neutral and alkaline (6.7≤ pH ≤ 9.20), permeable (1.9 í 10-5?m·s-1?≤ K ≤ 8.2 í 10-4?m·s-1), with a high specific yield (13.33% ≤ Sy ≤ 33.33%) which can favor the pollutants transfer. The heavy metals (Fe, Cu, Zn, Cd, Cr and Pb) have very high concentrations in soils. The integrated pollution indices (PLI) indicate that almost 70% of Songon soils are moderately contaminated by the investigated heavy metals, with windows presenting high indices of pollution related to the intensive use of fertilizers and pesticides. The establishment of new boreholes in the Songon area should consider these heavy metals, so as to avoid the risk of groundwater pollution due to the physical properties of soils.
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.
