SAFETY ANALYSIS OF WATER RESOURCES AND ECG-ENVIRONMENT IN SHIYANG RIVER BASIN

来源 :中国地理科学(英文版) | 被引量 : 0次 | 上传用户:xiaoxiaoDang
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The research on the present situation of soil and water development and utilization in Shiyang River Basin shows that water resources and eco-environment situation in this area are near the edge of collapse. Since the water crises occurred in the 1970s, problems caused by continuous decrease of water resources have been becoming serious year by year and eco-environment crisis occurred as a consequence. Up to now, 10 380ha of irrigated lands have been abandoned due to sand coverage and water shortage in the basin. Ground water was over exploded in Wuwei and Minqin because of water shortage. Ground water table in many places dropped under 5m (which is the ecology water table level), thus about 3000ha ofElaeagnus angustifolia forest come to dead and another 5800ha become feeble, and wind-driff sand near the oasis become alive. According to the current situation, if water utilization scope was not enlarged, a water transfer volume of 600×106m3/a from other areas will be suitable to keep water resources and eco-environment safety in the basin, and also 70× 106m3/a will be left as spare water. Under this condition the water resources and eco-environment of the basin can reach the critical safety line of 2.032× 109m3/a; or if 180× 106m3 of water can be transferred from other areas, the water resources can reach the safety warning line of 1.732× 109m3/a.
其他文献
This paper, relates the lee vortex which is triggered when the rotating and stratified flow passes over the large obstacle by using towing tank and based on the
本文主要就高速公路工程而言,在该工程量清单计价模式下,从施工单位角度出发,以切身工作实践经验来简单谈一谈工程变更的管理工作.
结合2座桥50m、54mT梁移运和施工架设,找到了T梁架设过程中遇到的T梁旁弯(侧拱)造成影响T梁架设安全及安装无法按设计位置就位的原因,并分析原因,就问题的出现,提出了解决的
Based on the successful simulation of a typical winter urban boundarylayer (UBL) process over Beijing area during the Beijing City Air Pollution Experiment (BEC
可行性研究是建设前期工作的重要步骤,是确定项目是否进行投资决策的依据.对建设项目进行可行性研究是基本建设管理中的一项重要基础工作,是保证建设项目以最小的投资换取最
An important diplogenetic mineralization event superimposed on pre-existing exhalation sediments in the Tongling area, Anhui province, was triggered by widespre
通过对2003年2~3月采自五里湖水域代表样点的背角无齿蚌(Anodonta woodiana)及用于对照的水样、底泥中重金属的测试,初步得出了Zn、Cu、Pb、As和Cd在这3类样本中的浓度范围.虽
SHRIMP U-Pb zircon analyses for a gabbro sample from the Garzê ophiolite block yielded a mean 206Pb/238U age of 292±4 Ma, which indicated that the spreading t
Over the last 2000 years, approximately 38 ancient cities were abandoned through desertification in Hexi Corridor, Northwest China. Among them, 21.05% were aban
Parity testing is one of the compact testing techniques,which, traditionally, relies on applying all 2n input combinations to an n-input combinational circuit w