论文部分内容阅读
基于策勒绿洲78个取样点的地下水埋深、矿化度和pH值的观测资料,应用遥感、地理信息系统、空间插值和地质统计学分析的方法对所取数据进行空间变异性分析.结果表明:1)地下水埋深和pH值服从正态分布,矿化度服从对数正态分布;2)地下水埋深、矿化度和pH值都具有强烈的空间相关性,在步长为8km范围之内,地下水特征的空间变异是各向同性的,当步长>8km时,四个方向上的半变异函数发生了不同的变化;3)受盆地地形影响,地下水埋深从南到北变浅,东部区域埋深最浅,最小为1.56m;矿化度分布趋势则是从南到北逐渐增大;pH值高值区发生在绿洲东南部和中北部,pH值高的区域矿化度较低,而pH值低的区域矿化度较高;4)绿洲耕地主要分布于地下水位埋深为5～25m,且矿化度<2.0g·L-1的区域;林地和草地分布于绿洲边缘区,该区域地下水埋深浅,平均水位<10m,而地下水矿化度较高,>2.0g·L-1.
Based on the observation data of groundwater depth, salinity and pH of 78 sampling points in Cele Oasis, spatial variability was analyzed using remote sensing, geographic information system, spatial interpolation and geostatistics methods .Results The results show that: 1) Groundwater depth and pH value are normal distribution and mineralization degree follows lognormal distribution; 2) Groundwater depth, salinity and pH have strong spatial correlation, Within the range, the spatial variability of groundwater features is isotropic. When the step length is> 8km, the semi-variogram changes in four directions. 3) Due to the topography of the basin, the groundwater depth varies from south to north The depth of the eastern part is the longest and the minimum is 1.56m. The trend of salinity distribution is gradually increasing from south to north. The high pH value region occurs in the southeastern part of the oasis and in the middle part of the north, where the pH value is high Low salinity and high salinity; 4) Oasis arable land is mainly distributed in the area where the groundwater table is buried at a depth of 5 ~ 25m and salinity <2.0g · L-1; Located in the marginal area of the oasis, the groundwater in this area has a shallow depth with an average water level of <10m and a high salinity of groundwater> 2. 0g · L-1.