| 环渤海低平原水土盐分与水位埋深的空间变异及协同克立格估值 |
| |
| 关键词:low plain around the Bohai Sea soil salinity total dissolved solid groundwater level CoKriging |
| 基金项目:国家科技支撑计划项目(编号: 2007BAD69B02; 2009BADA3B05); 河北省科技厅重点基础研究项目(编号: 08966711D) |
|
| 摘要点击次数: 3059 |
| 全文下载次数: 4422 |
| 摘要: |
| Spatial Variability of Soil Salinity, Total Dissolved Solid and Groundwater Depth Based on Cokriging in the Low Plain around the Bohai Sea |
| Taking into account the problem of soil salinity, total dissolved solid (TDS) of groundwater and groundwater level (GWL) existient in the low plain around the Bohai Sea, the authors collected soil samples at the depths of 0~20 cm from 127 sites in the plain, determined the soil salinity, and measured shallow groundwater depth in 130 sites and TDS of water samples in 128 sites. Classical statistical and geostatistical methods combined with GIS technique were used to analyze spatial variability of soil salinity, TDS and GWL. The results show that spatial variability of soil salinity and TDS belongs to the moderate degree while GWL belongs to the strong degree with Cv being 0.91, Cv being 0.87, and Cv being 1.06. The semivariogram and cross-semivariogram of soil salinity, TDS and GWL were fitted by the spherical and the exponential model respectively. Spatial correlation of single variables belongs to the moderate degree, while cross variable belongs to the strong degree, with spatial correlation distance 135.6 km to 223.2 km longer than 40.6 km to 144.8 km. Ordinary Kriging and CoKriging maps show that soil salinity and TDS spatial distribution are almost the same, increasing from the inland plain to the east coastal plain, spatial distribution difference exists in different altitudes, and the soil salinity and TDS rise with the decrease of the altitude; nevertheless, things are just the opposite for GWL. Soil salinity is high in Tangshan-Tianjin-Cangzhou-Dongying-Binzhou, TDS is high in some areas of Tianjin and Cangzhou, and GWL is low in the Yellow River Delta. In comparison with the ordinary Kriging with the same sampling numbers, the root-mean-square error produced by CoKriging decreases by 0.29%~4.78%, while the correlation coefficient between the predicted value and the measured value increases by 2.03%~20.58%. |
| ZHOU Zai-ming,ZHANG Guang-hui,WANG Jin-zhe,YAN Ming-jiang.2011.Spatial Variability of Soil Salinity, Total Dissolved Solid and Groundwater Depth Based on Cokriging in the Low Plain around the Bohai Sea[J].Acta Geoscientica Sinica,32(4):493-499. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|