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| 基于探地雷达测定土壤水分含量实验研究 | |
| 其他题名 | The Experimental Study on Estimating Soil Water Content with Ground Penetrating Radar |
| 王前锋 | |
| 出版年 | 2011 |
| 学位类型 | 硕士 |
| 导师 | 周可法 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 随着新疆经济的发展，农业-水-生态之间的矛盾越来越突出，水资源短缺是问题的关键，精准农业的发展将是解决这一问题关键，合理设计灌溉措施对土壤含水量测定提出了更高的要求，传统的测定方法不能满足应用要求，本文选取三工河流域古尔班通古特沙漠南缘的中国科学院阜康荒漠生态站北沙窝实验区进行实验研究，通过探地雷达实验，利用探地雷达多通道配置测量，提出探地雷达最佳天线判定方法，建立了探地雷达测定土壤体积含水量相关模型，能快速有效地测定田间尺度土壤含水量，得到的主要结论如下：\n（1）电导率超过1.224时，时域反射仪无法探测土壤水分含量，仅可用来测定土壤电导率，电导率小于1.168时，时域反射仪测定土壤水分含量是可行的。烘干法与时域反射仪测量结果进行了二次曲线拟合，建立了TDR结果标定模型，其判决系数为0.64265。\n（2）探地雷达测定土壤水分含量，同一通道，天线间距越小，测线上测得的土壤水分含量空间异质性越大，同一天线间距下，长通道测定的土壤体积含水量总体上低于短通道土壤含水量，两通道测定的土壤含水量，空间上变化趋势一致。\n（3）探地雷达多通道配置下，实验场区土壤质地确定条件下，在模型建立和应用的基础上，得到最佳天线间距为1.9-2.1 m时，测得的土壤含水量最精确，地面波穿透深度20-30 cm，该深度下最大偏差小于0.036 m3/m3，其结果精度能够满足生产的需求。\n（4）空间分布上，探地雷达测定的土壤体积含水量与实际地表含水量一致，靠近灌木林区域土壤体积含水量出现相对高值。\n探地雷达能够快速有效地测定田间尺度土壤含水量，一定程度上解决了土壤水分含量测定田间尺度问题 |
| 英文摘要 | With the economic development of Xinjiang, the conflict among agriculture, water and ecology is more and more prominent, and the water shortage is the key to the problem, the development of precision agriculture can solve the problem, and the design of irrigation on soil water content made a higher demand, the traditional method of estimating soil water content can not meet the application requirements. This experimental was conducted at Fukang Station of Desert Ecology of Chinese Academy of Science located in the southern part of Gurbantunggut desert of Sangong river basin，by ground penetrating radar experiment measurement, A method is presented for the determine of optimal fixed offset between antennas by using ground-penetrating radar measurement of multi-channel configuration, and a soil volumetric water content model is built, the goal to quickly and efficiently estimate Field scale soil water content can be achieved, and main conclusions are as follows:\n(1)When the conductivity of estimated soil by the time domain reflectometry is more than 1.224, the time domain reflectometry can not be used to estimate the soil volumetric water content and only be used to measure soil electrical conductivity, When the conductivity of estimated soil is less than 1.168, measuring the soil volumetric water content by the time domain reflectometry is feasible, time domain reflectometry calibration model was established by quadratic curve fitting results between measuring of drying method and estimating of the time domain reflectometry, and discriminant coefficientis 0.64265.\n(2)When the same channels of ground penetrating radar was used, the smaller the distance between antennas separation, the greater the spatial heterogeneity of he soil is on the survey line, when the different channels of ground penetrating radar was used, the soil volumetric water content under the long channel is always lower than the soil volumetric water content under short channel, the change trend is uniform under the two channels.\n(3)Under the experimental field conditions by multi-channel configuration of ground penetrating radar, the optimal fixed offset of two antennas of 1.9-2.1m based on Establishment and application of the model, the estimated soil volumetric water content is most accurate by using the antenna separation, and the penetrating depth of ground wave of ground penetrating radar is 20-30cm, the maximum deviation of result estimated by GPR is less than 0.036 m3/m3 at the depth, the result accuracy can meet the production demand.\n (4)In the spatial distribution, estimating the soil volumetric water content，and the soil volumetric water content near bush area is relatively higher. by ground penetrating radar is consistent with the actual surface the soil volumetric water content\nGround penetrating radar can quickly and efficiently estimate field scale soil water content，to a certain extent，the study solve the problem of field scale absence |
| 中文关键词 | 探地雷达 ; 时域反射仪 ; 三工河流域 ; 土壤含水量 ; 地面波 |
| 英文关键词 | Ground penetrating Radar Time Domain Reflectometry |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 地图学与地理信息系统 |
| 来源机构 | 中国科学院新疆生态与地理研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/286999 |
| 推荐引用方式 GB/T 7714 | 王前锋. 基于探地雷达测定土壤水分含量实验研究[D]. 中国科学院大学,2011. |
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