Volume 6,Issue 6,2008 Table of Contents

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  • 1  Technical Features of Two Bulb Tubular Pumps
    ZHANG Ren-tian DENG Dong-sheng ZHU Hong-geng YAO Lin-bi
    2008, 6(6).
    [Abstract](12) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The bulb tubular(propeller)pumps will be installed in many pumping stations of East Route Project of South-to-North Water Diversion in China,including Linjiaba Pumping Station and Huaiying 3rd Pumping Station.In these two pumping stations,international cooperation technologies and different structural units have been used.The structural features and hydraulic performances are introduced mainly and the advantages of two bulb tubular pumps are analyzed in the paper.Further,the applicable prospects and some issues needed to be improved in different structural bulb pumps are put forward.
    2  Method for Health Risk Assessment of Groundwater Pollution
    LI Zheng-hong BI Er-ping ZHANG Sheng YIN Mi-ying MA Lin-na WANG Wen-zhong ZHANG Yi-long
    2008, 6(6).
    [Abstract](28) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    3  Hydrological Effects of Forest Litter Layer and Soil Layer of Sea-buck thorn Plantation in Bashang Area
    JIA Zhi-jun WANG Fu ZHEN Bao-yan LIU Yu-tao DONG Zhi
    2008, 6(6).
    [Abstract](4) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    通过以坝上高原典型区域尚义县的沙棘林地为研究对象,从林地枯落物蓄积量和持水能力,土壤物理性状、土壤蓄水量和土壤入渗性能等方面,对沙棘林枯落物与土壤的水文效应进行了研究。结果表明:沙棘林地枯落物的蓄积量为1.50×103kg/hm2,枯落物有效拦蓄量达到3.86×103kg/hm2,有效拦蓄深为0.39mm。与裸沙地相比,沙棘林下与林间0~40cm土层内的平均容重降低13.87%和4.05%,而总孔隙度较裸沙地增大13.95%和2.37%;沙棘林可增加土壤的有效持水量和饱和持水量,其林下与林间0~40cm土层内的有效持水量为裸沙地同层次的有效持水量的3.73倍和2.28倍。沙棘林间和林下的土壤初渗速率和稳渗速率分别是裸沙地的1.79倍、1.34倍和1.67倍、1.29倍。说明沙棘林能够较好地改善该地区的土壤结构,具有良好的水文生态功能。
    4  Changes of Tritium Concentration in Precipitation of China in Two Decades
    ZHANG Lin WANG Ying LIU Fu-liang
    2008, 6(6).
    [Abstract](4) [HTML](0) [PDF 0.00 Byte](0)
    Abstract:
    The ratio of 3H content of precipitation will not only provide important background information,but also for the use of isotopes for environmental science and the associated isotope hydrology,meteorology and environmental disciplines.The analysis was conducted on monthly and annual mean 3H content of precipitation for spatial and a fixed location by using the data of China(1985-2002)in Global Network of Isotopes in Precipitation(GNIP)Database.The tritium concentrations of temporal and spatial changes in trends and meteorological factors,geographic factors were discussed.

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