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DEM is an important kind of data widely used in terrain visualization. In order to reduce the size of the data, a lot of compression methods are used to compress DEM. In this paper, we adopt the famous embedded compression method SPIHT, and combine two different Context-based Adaptive Binary Arithmetic Coding(CABAC) strategies to compress the DEM data. Different contexts in the SPIHT algorithm are...
Chloride mass balance (CMB) method for unsaturated zones was applied to estimate groundwater recharge in northwestern Shaanxi Province, where the climate is typically semiarid and water use depends largely on groundwater resources. Based on three different chloride profiles, similar recharge estimations of 49.6mm/yr, 47.2mm/yr and 45.9/yr, representing 12.5%, 12.6% and 11.6% of MAP (mean annual precipitation)...
This paper collects and summaries the existing materials, taking the field obersavations. The evapotranspiration in Ge'ermu area is estimated by combining hydrologic data and the remote sensing data, and the law of evapotranspiration distribution variation in study area was obtained statistically. So as to analyse the factors of influencing evapotranspiration. The result showed that many crucial physical...
In order to study the impact on the river pollution to the riverside water resource, we chose the fine sand from WeiHe River to make an experiment of sand box indoor. We have simulated different cases that the river and groundwater infiltrated by a unified curve to the river “disconnect” groundwater. Accordingly we found the law of the impact on the river pollution to the riverside water resource...
River base flow is defined of the amount of groundwater recharging river runoff. Base flow index is the ratio of base flow and runoff. in Wei River Basin, the annual average base flow index was 0.475. We can see that the base flow plays an important role in the runoff formation, maintenance and regeneration process. Studying Wei River Basin base flow trends characteristics is of great significance...
Base flow is an important component element of water resources, which plays an important role in maintaining ecological base flow. Due to the difficulty in measurement, it is important to select an adaptive base flow separation method for further base flow research. Taking Weihe River Basin as the research object, based on the hydrological data of Huaxian County, this thesis adopts three different...
Pb2+ is selected as pollutant to study its adsorption characteristics on the sediments (clay, silt, fine sand, medium sand and coarse sand) at Weihe River and to discuss the effects of temperature and pH on adsorption. The results show that the isothermal adsorption curves of Pb2+ on the sediments of clay, silt, fine sand, medium sand and coarse sand at Weihe River are all in line with the Langmuir...
Mu Us Sandy Land is located in the arid and semi-arid area, the vegetation is an important factor of ecological environment. Based on the changing rule of surface soil water content and profile water content in the covering areas and the uncovering areas of the two typical vegetations—Salix psammophila and Artemisia's profiles, according to the variation coefficient of the profile water content, we...
Aimed at the current situation of nitrogen pollution in groundwater, adsorption characteristics of ammonia-nitrogen onto different lithology named silty sand, silty clay and clay were studied. The results indicated that the process of ammonia-nitrogen adsorption onto soils mainly occurred within 0~2 h, then attended to a dynamic equilibrium. Two kinetic models can describe the experiment data and...
Drinking water safety is an important part in water scientific field. The traditional living drinking-water quality assessment can not evaluate wholly the impacts of groundwater quality on human body. The groundwater health risk assessment is applied to evaluate the quality of groundwater providing to an important city in west of China in this paper. The analysis shows that health risk super standard...
Shallow high-fluoride groundwater with fluoride concentration above 1.0 mg/L occurs widely in Guanzhong Basin, northwestern China. It is mainly distributed in areas on the north of Wei River in the eastern and central parts of the basin. Characterized by the chemical composition of transitional types of groundwater, the high-fluoride groundwater samples commonly belong to dilute water or slightly...
Prices of services are the increasingly important decision factor to all firms seeking maximum service profits, but it is a very difficult to estimate the prices of service projects, so service price becomes the controversy focus of firms. Activity based costing (ABC) is the optimized method of costing services cost, and the accurate cost information provided by it is playing a very important role...
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