The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
To find out heavy metal pollution in and ecological risks of the sediments in Daliaohe Estuary, 19 surface sediment samples were collected from Daliaohe Estuary and analyzed for contents of Cu, Pb, Zn and Cr. The Indices of Geo-accumulation and Mean Sediment Quality Guideline Quotient were employed to evaluate the pollution status and ecological risks. Similar results were obtained through these two...
A fargoing heavy rain occurred on November 9 in 2009 in the middle and lower reaches of Yangtse River. There are also the gale, hail and short-duration heavy rain exist in Hunan, Hubei, Jiangxi, Zhejiang, Fujian etc. Analysis indicate that the severe convective weather occurred when the low pressure trough move eastward, then form cyclone and move into the sea at last. This disaster mainly caused...
In this study, based on the total coliforms (TC) and total bacteria (TB) detected in rural drinking water resources (RDWR) of Ya'an, and applying exponential model and β-Poisson model of “low microbe content risk assessment”, the quantitative evaluation of risk associated with TC count and TB in 221 water samples was developed. Results showed the annual risk values (ARV) of all the water samples were...
Explored roughness variation with water depth in the rectangular concrete channel by flume experiment and thus established quadratic function of water depth and the roughness, the calculated result showed that the roughness increases with depth. Channel wall roughness was obtained and the roughness in other water depth was calculated according to equation. Through error analysis and calculation, in...
Based on principal component analysis theory, this paper has evaluated the water quality in Ge Lake by using the characteristics of principal component analysis-the integrated treatment of dimensionality reduction. The results show that the water quality in Ge Lake has been at or inferior to the IV class, Ge Lake water body has in general reached the later period of moderate eutrophication. The main...
Liangtan River is a typical and heavily polluted branch river of the Three Gorges Reservoir. A survey and analysis of the pollution condition of the river can provide basic data and over planning consideration for basin pollution prevention and environmental rehabilitation, based on which a monitoring survey was carried out and analyzed on water quality of Liangtan River. The analysis found out the...
By analyzing the hydrologic and water quality monitoring data of typical stations of Poyang Lake, the objectives were to describe the characteristics of water quality in water-level changes. The results indicated that: the average water level of Poyang Lake showed downward trend, further more, water level amplitude of Poyang Lake was increasing in recent years; the concentrations of NH3-N and CODMn...
Information on monthly and yearly SO2 and NO2 vertical column density means over the Yangtze River Delta from January 2005 to November 2010 was reported based the remote sensing data from the OMI sensor. In conclusion, from spatial perspective, the yearly SO2 average mean is high along the Nanjing-Shanghai railway line. And the further it is from the railway line, the less average mean is. The distribution...
The Ecological Infrastructure is defined as the structural landscape network that is composed of the landscape elements and spatial patterns. Taking Shitan Town (Guangzhou) as a case study, this paper introduces the theory of Landscape Security Patterns, and proposes a systematic methodology in planning Ecological Security Patterns under the ecological control factors of farmland, woodland, wetland,...
After a comprehensive analysis of tectonic activity, topography, exogenic geological disasters and human activity, we select 10 factors to evaluate quality of geological environment of the Pearl River Delta. In order to increase the resolution of our model, we employ Analytic Hierarchy Process (AHP) to calculate the weight of these factors and employ the spatial analysis module in GIS to build up...
The surveys on biodiversity characters were carried out with the methods of line transect from July to August 2010 in four types of habitats in Yellow River Wetlands in Shaanxi province. A total of 61 bird species belonging to 15 orders, 33 families were recorded. Among them, 1 species is rank I nationally protected birds, 2 species are rank II nationally protected birds, 4 species are included in...
Organic matter release and nitrate biological degradation test were conducted in order to find more ecnomical and efficient carbon source,with hust, wheat straw, rice straw and mixed carbon sources as the main research object. COD determination indicated that all carbon sources had different COD releasing ability and the release ammont of hust, wheat, rice straw were 1.12mg/g·d, 1.03 mg/g·d and 1...
The present study examined the recent environmental history of the Poyang Lake, located in the middle Yangtze River region, central China. High sedimentation rates, revealed by 210Pb measurement in different periods of the lake, ranged from 0.035 to 1.08cm/year. The results indicate that the change of sedimentation rate is correlative to the intensity of human activities. In addition, pressures from...
Soil moisture is one of the most important factors for hydrology research and agriculture management. But it is measured only at limited locations and temporal periods due to the limitations of technology and economy. Distributed hydrological model can simulate the variation and spatial distribution of soil moisture conveniently. This paper compared the simulation results of two different distributed...
China is a beautiful country with hundreds of thousands of mountains spreading over the country. Climate change poses a potentially major challenge to social and economic development in China mountain areas. Development is successful if it reduces the vulnerability of mountain areas and poor people to existing climate variability, while also building in the potential to anticipate and react to further...
14 kinds of PCBs were determinded in water and sediment of Qin Huai River in Nanjing, P.R.China. The results showed that: the concentration range of ΣPCBs in the water of the river was 19.56∼843.22 ng/L, their mean content was 170.19 ng/L; the concentration range of PCBs in the sediment was 125.80∼1714.84 ng/g, and their mean content was 718.45 ng/g. Compared with the rest of the world river, PCBs...
It's effective restoration approach to analyze the balance of water using and find out the water gap for Yongding River in Beijing in the face of ecological deterioration. This paper described the thrice water balance principle, connotation and theory based on the supply and demand balance, rationality and feasibility analysis. On this basis, this paper evaluated and analyzed the water resources condition,...
Chengdu Municipal People's Government launched the comprehensive restoration project of Sha River in 2001, which focused on ecology and sustainability through pollution abatement and urban landscaping. Afterwards the waterfront environmental quality of Sha River was improved greatly and Sha River won the “International Thiess Riverprize” in 2006.But with the increase of recreational and ecological...
This paper presents the route design scheme of reconstruction of Guizhou-Guangxi Railway from Jinchengjiang to Duyun. By comparing the reconstruction scheme of the existing route with the new-built scheme, this paper indicates that the reconstruction scheme of the existing route is obviously advantageous, especially, the scheme can make the best use of the existing route, avoid crossing national landscape...
Total bacterial count, carbon substrate utilization and diversity of microorganism is analysed. The results show that there are many differences between two different watershed ecosystem in Wen Yu River.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.