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.
China is a country of extreme lack of water resources. With the reform and opening up, at the same time of economic prosperity and development, the condition of groundwater pollution is becoming more and more serious. As important analytical tools, big data and differential game theory make more and more contributions to the analysis of groundwater pollution. In this paper, a groundwater pollution...
Spatial information on irrigation is needed for a variety of applications, such as studies on water exchange between the land surface and atmosphere, climate change, and irrigation water requirements, water resources management, hydrological modeling, and agricultural planning. However, it is hard to map irrigated areas automatically by traditional image classification methods because of the high...
Irrigated agriculture in China is of national and global significance. Official statistical data on agricultural water withdrawal might be more relevant to the actual water consumption in an agriculture sector than the irrigation requirements estimated from modeling studies. However, agricultural water withdrawal is always reported on the basis of geopolitical units or river basins, without spatial...
Over exploitation of groundwater resulted in seawater intrusion in coastal aquifer of Shenzhen city, China, during the 1980s and 1990s. In recent years, the improvement of water supply facilities alleviate seawater intrusion, however, it is still of great concern in some local region. A three dimensional density-dependent numerical model using FEFLOW code has been developed to simulate the extent...
Currently, the problem of land environment is one of the most serious environmental problems in China. This article will analyze the following aspects to solve the problem of the existing land environmental to promote social development better.
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...
we selected the northern slope of Qilian Mountain as typical study area, so as to detailed study the influence of forest on runoff. Firstly, we divided the study area into different basin-based units( a total of 20 basins from southeast to northwest), then we classified all basins into 7 groups though clustering analysis based on basin features, meteorological and hydrological features data, forest...
In the paper, some relative research theory and calculation methods for the river ecological basic flow both at home and abroad have been summed up, and then, considering the actual conditions of Sushui River, the function of the river reach is determined. The ecological basic flow of the river in different periods has been quantitatively researched with Tennant and the minimum monthly average flow...
Eco-city research has been given close attention during the past decades, and the evaluation of it has become a key part. According to the research results of eco-city evaluation at home and abroad, an evaluation index system has been established, including resource and environment, economy, socio-culture and management. On the basis of the index system, fuzzy matter-element model is used to evaluate...
In recent years, researchers pay increasingly attention on river ecological restoration at home and abroad. According to the practical situation of Tianjin Airport Economic Park river water environment and inter-external experiences, several ecological techniques, such as phytoremediation, artificial aeration and ecological riverbank, were adopted to river ecological restoration. And related operation...
The study on the coupling relationship between the variation of soil erosion and geomorphological factors in watershed scale will contribute to the effectiveness of soil and water conservation. Based on soil erosion database, the topographic variations of soil erosion in watershed and the relationship between it with different geomorphologic factors were analyzed in the paper, with a case study of...
In order to study the vertical movement of soil water, two loess profiles were sampled in Weinan on July 22, 2007 and March 22, 2008. Oxygen isotope compositions of soil water from the two profiles were measured to reveal information about soil water vertical transporting amount in unsaturated zone. The result show that soil water moved upwards and the vertical transporting amount is about 6.89mm...
Based on field investigation and indoor analysis, distribution characteristics of four available trace elements, including Cu, Fe, Mn, Zn, in the terrace land in loess region, was studied. Results indicated that, these four available trace elements distributed unevenly across soil profile, and its variation coefficient was high, which reached medium and high level. Distribution trends of these four...
In order to propose an effective method for the reclamation of sewage sludge, sewage sludge from three waste water treatment plants were sampled and analyzed. The results show that the digested sludge samples are alkalescent, and the undigested sludge samples are acidic. The moisture content ranged from 78% to 83%. The samples have plenty of organic matter, N, P, K, and the heavy metals are relatively...
The study on groundwater vulnerability is an effective technical measure for rational development and protection of groundwater resource. In the paper, according to the hydrogeology conditions of the Lincang Basin in Yunnan Province, USEPA's DRASTIC method was applied to evaluate the groundwater vulnerability of this area with the consideration of depth to the water table, Net recharge, aquifer material,...
This paper study base on the engineering fact of Diaozhongba landslide. A new method of data processing based on time series analysis of wavelet technology was used to refined data processing function of wavelet. The grey system theory is attenuates the primitive sequence through the production transformation randomness. The Established GM (1,1) model with this landslide slope government process actual...
In recent years, the runoff of Haihe River basin has decreased significantly, especially after 1980s, due to climate change and human activities. So in this paper, a variable fuzzy method was adopted to research the variation characteristics of rainfall and runoff, and infer the main driving factors for runoff reduction. According to the parameter of the theorem and its relationship with zero, the...
China's gross amount of hydraulic resource ranks first in the world; however, at present, China's economic development faces energy bottleneck. Huge market demands, as well as the strategy of western development, provide hydropower with an opportunity and a broad development prospect. At the same time, some negative influence on environment and ecology also give hydropower development with unprecedented...
In this paper, stormwater runoff from an urban traffic road and building located in Beijing, China, was characterized to measure the stormwater runoff discharge rates and pollutant concentrations. Based on monitoring, the runoff water quality on two underlying surface conditions was analyzed. The temporal dynamics of chemical oxygen demand (COD), NH3-N, NO3-N and total phosphorus (TP) were similar...
Assessment the changes of surface water quality in different times throughout one year is an important aspect for evaluating temporal variation of river pollution due to natural or anthropogenic input of point and non-point sources to water environment that is gradually deteriorating. In this paper, principal component analysis & factor analysis (PCA & FA) is conducted according to the average...
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.