Surface water and sediment contamination by heavy metals in the Střela River Basin
Czech Republic ; Flood ; Fluvial deposit ; Heavy metals ; Hydrochemistry ; Pollution ; Surface water ; Water quality
The analysis is based on analysis of surface water and sediment chemistry data from the longterm regular monitoring network completed by the own samples taken on the network of profiles set up within the research project. The standard methods were
used to analyze the sediment chemistry - water quality classification using the ČSN 757221 standard, sediment contamination classification using the geoaccumulation index and comparison of observed concentrations of heavy metals in sediments. Unlike
numerous water basins where the contamined sediments were washed out and the pollution load levels dropped, the Střela River Basin did not record significant changes in pollution level related to the flood. - (EN)
Dynamical variations in groundwater chemistry influenced by intermittent water delivery at the lower reaches of the Tarim River
Arid area ; China ; Environmental degradation ; Groundwater ; Hydrochemistry ; Salinity ; Water quality ; Water resources ; Watershed ; Xinjiang
The water of Bosten Lake was released to lower reaches of the Tarim River for 5 times from 2000 to 2002. The changes of total dissolved solid (TDS) and the major ions were analyzed during this period. It was found out that TDS and the concentrations
. In addition, the salt in groundwater was only diluted but not removed by the water. It was suggested that ecological measuresshould be sought to really promote the quality of the groundwater at the lower reaches of the Tarim River.
Impact of climate change on the surface water of Kaidu River Basin
China ; Climatic change ; Ecosystem ; Humid environment ; Impact ; Interannual variability ; Precipitation ; Surface water ; Temperature ; Watershed ; Xinjiang
To reveal the changing trend and annual distribution of the surface water hydrology and the local climate in the Bayanbuluk alpine-cold wetlands in the past 50 years, the AA. used temperature, precipitation, different rank precipitation days
, evaporation, water vapor pressure, relative humidity, dust storm days and snow depth to analyze their temporal variations. The runoff of the Kaidu River has increased since 1987 which has a good linear response to the annual precipitation and mean temperature
in Bayanbuluk alpine-cold wetland. Climate change also affected ecosystems in this area due to its direct relations to the surface water environment.
The influence of thermokarst disturbance on the water quality of small upland lakes, Mackenzie Delta region, Northwest Territories, Canada
Arctic Region ; Canada ; Cold area ; Delta ; Hydrochemistry ; Lake ; Northwest Territories ; Permafrost ; Thermokarst ; Tundra ; Water quality
Chemical data are presented for water from 22 lakes in small upland catchments (
) concentration of the pristine lakes is greater than the mean concentration of lakes disturbed by thermokarst slumping. Soluble materials released from degrading permafrost are transported to lakes by surface runoff, elevating concentrations in lake water
. The percentage of total basin area influenced by thermokarst is positively associated with ionic concentrations in lake water and inversely related to DOC.
Interspecific variation of bark water storage capacity of three deciduous tree species in relation to stemflow yield and solute flux to forest soils
Birch ; Deciduous forest ; Ecosystem ; Forest ; Geo-ecology ; Nutrient ; Oak ; Soil water ; Temperate zone
The aim of this study is to couple bark water storage capacity with stemflow production and solute inputs to the forest floor, thereby illustrating the importance of stemflow generation and leaching of nutrient-ions to the geoecology of forest
ecosystems. Bark water storage capacity is linked with the geoecology of temperate deciduous forests because stemflow volume and soluble inputs are partly determined by bark water storage capacity.
Classification ; Czech Republic ; Human impact ; Lake ; Water quality
Anthropogenic lakes constitute the most genetic groups of lakes in the country. The properties of water determine the potential utilization, such as in water supply, fishing, agricultural, industry or recreation nature. Five anthropogenic groups
Applications of a climatic water budget to tick-borne disease research
Applied climatology ; Disease ; Eastern United States ; Remote sensing ; Soil moisture ; United States of America ; Water balance
The AA. used the Thornwaite-Mather water budget technique to predict soil moisture under forest canopies, the primary habitat for the tick vectors of Lyme disease bacteria. This information, together with other environmental variables that correlate
The dynamic variation of water resources and its tendency in the Tarim River Basin
China ; Climatic trend ; Mountain ; Precipitation ; Runoff ; Temperature ; Water resources ; Watershed ; Xinjiang
The method of time series is applied to analyze the variation of precipitation and temperature from 1961 to 2002 in the mountainous areas of the Tarim River basin, as well as water consumption in the headstream and mainstream areas. The Kendall
Nutrient losses by wind and water, measurements and modelling
Africa ; Biogeochemistry ; Burkina ; Model ; Nutrient ; Sahel ; Sediment budget ; Soil erosion ; Water erosion ; Watershed ; Wind erosion
Two physically based models (WEPS and EUROSEM, both written in PCRaster) were extended with nutrient modules to investigate the role of wind and water erosion in the loss and gain of nutrients at the scale of a Sahelian field. The models are applied
Argentina ; Canal ; Economic history ; Hydraulic works ; Irrigation ; Irrigation system ; Mendoza ; Network ; Water ; Water economics ; Water management ; Water supply ; Water use
Agricultural use ; Cévennes ; France ; Historical geography ; Industrial use ; Nineteenth Century ; Rhône-Alpes ; Water ; Water deficit ; Water management ; Water resources ; Water use
Germany ; Saxony-Anhalt ; Surface water ; Urban ecology ; Water ; Water quality
The quality of the surface waters in urban areas is often degraded. The city of Halle was known as one of the largest ecological crisis areas in the former GDR. The river Saale which is crossing the city as main water vein is still heavely used
Historical drought and water disasters in the Weihe Plain
Through detailed statistics and analysis of drought and water disasters in the Weihe Plain in the historical period, the AA. discovered that in more than 2300 years (from 370 BC to 2000 AD), natural disasters occurred most frequently in 2 periods
: 610 to 850 AD; 1580 to 2000 AD. Different natural disasters occurred synchronously : when the drought occurred frequently, water disasters occurred frequently in the same periods. The excessive exploitation of natural resources and human disturbance
and damages to ecological environment are the major reasons for the increased drought and water disasters.
China ; Human impact ; Hydrochemistry ; Impact ; Outer conurbation area ; Polluted water ; Pollution ; Shanghai ; Stream ; Water quality
Forty middle and small rivers in 3 towns of Fenging, Songjiang and Zhujiajiao of suburban Shanghai were chosen as sampling sites for water quality research. Measurement results show that the rivers are under heavy eutrophic conditions, which
are several times greater than the critical values of the worst level of water. Water pollution situation has different temporal and spatial characteristics. Non-point pollution, such as village domestic sewage, farmland runoff, livestock feces, has become