| 沙漠非饱和风沙土壤水分特征曲线预测的分形模型 |
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| 引用本文： | 苏里坦,宋郁东,张展羽.沙漠非饱和风沙土壤水分特征曲线预测的分形模型[J].水土保持学报,2005,19(4):115-118,130. |
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| 作者姓名： | 苏里坦 宋郁东 张展羽 |
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| 作者单位： | 1. 中国科学院新疆生态与地理研究所,乌鲁木齐,830011
2. 河海大学,水利水电工程学院,南京,210098 |
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| 基金项目： | 国家重点基础研究“973”项目(G1999043506)资助 |
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| 摘 要： | 应用VanGenuchten提出的土壤水分特征曲线公式,推导出了沙漠风沙非饱和土壤水分特征曲线的分形模型。通过对古尔班通古特沙漠地9种不同土壤样本利用中子水分仪和负压计实测的水分特征曲线资料反求得到相应的分形维数,分析了分形维数与土壤质地之间的关系,结果表明随着土壤质地从流动风沙土、半固定风沙土到固定风沙土的变化,其分形维数呈逐渐增大。此外,基于土壤颗粒的重量与粒径分布求出了古尔班通古特沙漠地风沙土壤粒径的分形维数。通过对土壤水分特征曲线的分形维数与土壤粒径的分形维数的对比,得知它们之间存在着良好的线性关系。根据此关系,利用易测得的土壤粒径分形维数结合所推导的分形模型,对土壤水分特征曲线进行了预测,模型的预测结果很好地吻合了实测的土壤水分特征曲线。这一结果对于实际工作中根据风沙土壤颗粒大小分布的分形维数来预测沙漠风沙土壤水分特征曲线具有一定的指导意义。
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| 关 键 词： | 风沙非饱和土壤 粒径分布 土壤水分特征曲线 分形维数 预测模型 |
| 文章编号： | 1009-2242（2005）04-0005-04 |
| 收稿时间： | 2004-12-15 |
| 修稿时间： | 2004-12-15 |
Fractal Models for Predicting Unsaturated Sandy Soil Water Retention Curve in Desert |
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| Su LiTan;Song YuDong;Zhang ZhanYu.Fractal Models for Predicting Unsaturated Sandy Soil Water Retention Curve in Desert[J].Journal of Soil and Water Conservation,2005,19(4):115-118,130. |
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| Authors: | Su LiTan;Song YuDong;Zhang ZhanYu |
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| Abstract: | Numerous studies have shown that soil particle size and weight distribution are fractals, which are generally described with fractal geometry in this paper, analysis of nine sampling soils from sandy soil blown by wind plots in Kurbantunggut desert. A fractal model for sandy soil water retention curve is derived with Van Genuchten model. The fractal dimensions of sandy soil water retention curve are calculated with experimental data for sandy soil water retention curve of nine different kinds of soils in Kurbantunggut desert. And the fractal dimensions of sandy soil water retention curve are compared to the fractal dimensions of particle size distribution which are calculated on the basis of accumulative mass distribution of soil particles. The results show that the fractal dimensions of sandy soil water retention curve and particle size distribution increase with soil texture that ranges from floating sandy soil to semi-immobile soil,and to immobile soil. The fractal dimensions of sandy soil water retention curve show slightly different form and are linear related to the fractal dimensions of particle size distribution respectively. The soil water retention curve has been predicted by fractal model, which showed that simulation values of soil water retention curve significantly close to observation values of that. This indicates that the sandy soil water retention curve can be predicted by the fractal model for sandy soil water retention curve. |
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| Keywords: | unsaturated sandy soil particle size distribution soil water retention curve fractal dimension prediction model |
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