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groundwater
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  地下水
    Study the Sustainable Development of Groundwater Resources Based on the Theory of Changeable System
    基于变值系统理论的地下水资源可持续开发研究
短句来源
    Study on Supergene Ecological Effect Excited by Groundwater and Its Evaluation
    地下水引起的表生生态效应及其评价研究
短句来源
    Groundwater Resources Evolution Based on Paleoenvironmental Information from Groundwater System in the North China Plain
    从华北平原地下水系统中古环境信息研究地下水资源演化
短句来源
    Study on Theory and Application of Joint Regulation and Control for Rain and Flood Resources and Groundwater
    雨洪资源与地下水资源联合调控理论及应用研究
短句来源
    Application of Multi-level Recursive Regression Method in Groundwater Resources Assessment in the Plain Area of Central Jilin
    多层递阶回归方法在地下水资源评价中的应用
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  地下水
    Study the Sustainable Development of Groundwater Resources Based on the Theory of Changeable System
    基于变值系统理论的地下水资源可持续开发研究
短句来源
    Study on Supergene Ecological Effect Excited by Groundwater and Its Evaluation
    地下水引起的表生生态效应及其评价研究
短句来源
    Groundwater Resources Evolution Based on Paleoenvironmental Information from Groundwater System in the North China Plain
    从华北平原地下水系统中古环境信息研究地下水资源演化
短句来源
    Study on Theory and Application of Joint Regulation and Control for Rain and Flood Resources and Groundwater
    雨洪资源与地下水资源联合调控理论及应用研究
短句来源
    Application of Multi-level Recursive Regression Method in Groundwater Resources Assessment in the Plain Area of Central Jilin
    多层递阶回归方法在地下水资源评价中的应用
短句来源
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  地下
    Sustainable Development and Utilization of Thermal Groundwater Resources in the Geothermal Reservoir of the Wumishan Group in Tianjin
    天津地区雾迷山组热储地下热水资源可持续开发利用研究
短句来源
    GROUNDWATER RESOURCES CRISIS AND THE COUNTERMEASURES
    地下水资源危机及其对策
短句来源
    Application of the Theory of Changeable Groundwater Resources System
    地下水资源变值系统理论的应用
短句来源
    Groundwater Resources and Its Theory of Changeable System
    地下水资源及其变值系统理论
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    Multiobjective fuzzy management model for groundwater resources system
    地下水资源系统多目标模糊管理模型研究
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  “groundwater”译为未确定词的双语例句
    Study on Caiculative Method of Variable paraneters in Areal Water Resource Evaluation and the Interaction between Surface Water and Groundwater
    山丘区三水转化及应用变参进行区域水资源计算方法研究(下)
短句来源
    An important meaning of reasonable development and making use of ground water of Siping City
    四平市合理开发利用水资源的重要意义
短句来源
    ANALYSIS AND DISCUSSION OF DIVIDING UP GROUND WATER BY THE KALINLIN IMPROVING METHOD
    用加里宁改进法分割河川基流分析与探讨
短句来源
    Control and Utilization of Rainwater in Saline Groundwater Region of North China Plain
    华北平原有咸水区雨洪控制利用
短句来源
    Countermeasures and Advice on Sustainable Utilization of Groundwater Resources in Windy Sand Beach District of Yulin City
    榆林风沙滩区水资源可持续利用对策与建议
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  groundwater
In this paper, a semilinear elliptic-parabolic PDE system which arises in a two dimensional groundwater flow problem is studied.
      
Operator-splitting galerkin methods for one kind of oin reaction model for the pollution in groundwater
      
The operator-splitting methods for the mathematic model of one kind of oin reactions for the problem of groundwater are considered.
      
euphratica showed a proportional decrease with various degrees of elevation of the groundwater table after water release.
      
The soluble sugars and proline accumulation responded to the changes of groundwater table independently: the former occurred under salt stress, whereas the latter was more significant under drought stress.
      
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According to the fact that the groundwater is regionally overused disscusions are given to some problems relating to exploit and utilization of the groundwater. Unreasonable distribution of the well-group, serious waste, the lack of overall planning and effective abministration are considered. We have a try at calculating the quantity of water to be used in the near and far future and make, some suggestions in exploit, utilization and abministration of the groundwater in this paper.

本文从咸阳市地下水区域性超量开采的事实出发,分析了目前在开采利用地下水方面存在的主要问题:井群布局不合理,浪费严重,没有统一规划和有效的管理,进而对近远期用水量作了参考性预测,提出了今后开发利用和管理地下水资源的几点建议。

The South-to-north water transfer is a magnificent project in China, which brings excess water from the Yangtze River in the south to the arid areas of North and Northwest China. The proposed East Transfer Route would pass through and supply water to the Huang-Huai-Hai plain,The liuang-Huai-Hai plain is a weakly or easily salinized region . Owing to the influence of the pacific monsoon, this region has always been suffered from disasters of drought, flooding, salinization and alkalization throughout the history....

The South-to-north water transfer is a magnificent project in China, which brings excess water from the Yangtze River in the south to the arid areas of North and Northwest China. The proposed East Transfer Route would pass through and supply water to the Huang-Huai-Hai plain,The liuang-Huai-Hai plain is a weakly or easily salinized region . Owing to the influence of the pacific monsoon, this region has always been suffered from disasters of drought, flooding, salinization and alkalization throughout the history. Under this specific natural condition and human activity , sail salt-water movement is significantly characterized by seasonal changes. Soil is in the process of modern salinization,only varying in degrees of salt accumulation with location and times. Therefore, in the design and implement of the South-to-north Water Transfer, attention should be paid to the control of soil salinization .Alter the water is transferrer, the irrigation area in the Huang-Huai-Hai plain will be enlarged. There will be a beneficial effect on improving water condition of this region, leaching soil salt and promoting agricultural production. At the same time, the present salt-water balance of the region will be changed. The districts with poor natural drainage and without artifical drainge system might be confronted with secondary soil salinization.If the four lakes in the south of the Huang-He are used as regulation reservoirs in the South-to north Water Transfer project, then the elevation of the original storage level of the lakes will have a definite effect on the drainage of the main channels in the west of the four lakes and on soil salinization.From a long-term point of view, it is necesary to dig deep trough or to deepen the bottom of the lakes to meet the requirment of storage capacity and storage level of the lakes. In addition, the channel of drainage flooding and controlling seepage should be excavated along the west side of the four lakes, to reduce and control groundwater level of the region along the lakes, at the same time, pumping drainage station should be established at the outlet of the main drainage channel, to settle drainage outlet and increase capacity of drainage flooding.The conveyance of water for a long period of time in the main canals, especially in the stretches where the level of transported water is higher than the land surface, would lead to the formation of high-water-table zones on both sides of the canals, owing to a large amount of seepage of canals. The groundwater runoff in the left side of the main canals would impede in varying degrees and block the drainage of underground runoff and might lead to a general increase of the level of groundwater and aggravate soil salinization along the canal. Both an adequate engineering drainage system of controlling or intercepting seepage and an agricultural technique should be considered. At the same time, a scientific management system for the supply of transferred water should be worked out. So long as more attention is paid and appropriate and reasonable measures of water management, agricultural and engineering system are adopted, soil salinization could be prevented or controlled.

本文简要分析了南水北调东线输水工程实施后可能引起黄淮海平原土壤次生盐渍化的原因,并提出了相应的防止措施。

The exploitation and utilization of water resources affects environmental development and quality. In the early 1970's water resource in Hai He and Luan He drainage basins was exploited and utilized very greatly, once the natural environment was changed enormously. In the past 35 years, the total storage of new reservoirs was 25.9 billion cubic meters, and areas of new agricultural irrigation was 100 million mu, at the same time questions of flood control and water supply in cities, industrial and mining areas...

The exploitation and utilization of water resources affects environmental development and quality. In the early 1970's water resource in Hai He and Luan He drainage basins was exploited and utilized very greatly, once the natural environment was changed enormously. In the past 35 years, the total storage of new reservoirs was 25.9 billion cubic meters, and areas of new agricultural irrigation was 100 million mu, at the same time questions of flood control and water supply in cities, industrial and mining areas were partly solved, About 10.17 million mu of saline-alkali soil were improved and 23 million mu of low-lying and frequently flooded land were treated in a comprehensive way The drainage conditions in the plain of China were improved and soil has been changed into drab soil. The distribution of water resources in time and space varied greatly. The average annual discharge to the sea has been decreased half as much as the amount of 21 billion cubic meters in 1965 Utilizing ratio of water resources increased from 23% in the 1950' s to 59% in the 1970's. Annual extraction of groundwater amounted to 17.8 billion cubic meters, Groundwater levels went down and infiltration of precipitation increased. The utilizable and effective water resources that changed from evaporation of groundwater by some rational ways amounted annually to about 2 bilion cubic meters per year. The changes in the elements of water balance gave rise to harmful changes in environment, the main aspects being as follows.( 1 ) Natural water area of river and lakes greatly decreased, and aquatic products and their quality were also decreased due to water pollution and construction of sluice gates.2 ) As drainge of waste water increased, the quality of surface water and ground water deteriorated. The most serious conditions were in the Long Yang He. Generally, the water quality of the first flood each year is very poor.( 3 ) The variation of runoff of rivers often gave rise to siltation of resar-voirs, river courses and estuaries.( 4 ) Exploitation of groundwater in depth made groundwater levels decrease greatly over large area and cause surface subsidence. For instance, the area of land subsidence in Tianjing was 2,308 square km and the highest subsidence was 2.04m. In some areas, deep groundwater contains heavy fluoride and alkali materals, having effects on human health, on soil and plant.( 5 ) Due to decrease of discharge in some rivers, shipping was reduced, indirectly affecting environmental quality.The main reason for harmful impacts on environment is the shortage of water resources. The water transfer from south to north is a strategic measure to solve questions of environmental water conservancy When we consider water supply to cities, industry and agriculture, we must simultaneously consider water supply for fishery, shipping, treatment of siltaion, protection of water quality and tourism We must prevent water pollution and do well for management of environmental water conservancy and assessment of environmental impacts.

水利工程设施对防治旱涝及人民生活起了重要作用,但也出现了对环境不良影响的环境水利问题并指出了解决这些问题的措施和意见。

 
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