珠三角地区的土壤电阻率温度修正模型  

Temperature Correction Models for Soil Electrical Resistivity in Pearl River Delta

作　　者：周蜜[1] 王建国[1] 范璇[1] 黄松波[1,2] 豆朋[2] 王岩[2] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]广东电网公司佛山供电局,佛山528000

出　　处：《高电压技术》2012年第3期623-631,共9页High Voltage Engineering

基　　金：中国南方电网公司科技项目(JA2207005)~~

摘　　要：不同温度下测量得到的土壤电阻率需要进行温度修正。目前土壤电阻率或电导率的温度修正模型主要建立在土壤浸出液或电解质溶液的实验基础上,但仍被广泛应用于实际土壤的电阻率或电导率温度修正,这些模型对于不同土壤的应用效果及模型适应性值得研究。为此选取了珠三角地区具有代表性的砂土、砂粉土、粉土、粉壤土、粘壤土等5种不同质地各3种土壤样品,采用四极法布置的Miller soil box土壤电阻率测试箱,运用交流伏安法进行了5～45°C范围的土壤电阻率温度特性实验,结果表明目前大多基于土壤浸出液或电解质溶液提出的土壤电阻率温度修正模型对实际土壤数据的修正效果不理想。采用非线性回归分析方法分别针对5种土壤建立了4种形式的电阻率温度修正模型,结果表明,乘幂模型不适合在5～45°C的宽温度范围进行电阻率修正,建立的比率模型、指数模型和多项式模型对土壤电阻率温度修正效果较好。在此基础上建立了针对不同土壤的统一温度修正模型。The effect of temperature on the experimental data of soil electrical resistivity should be corrected using temperature correction models.Most of the existing temperature correction models have been developed from the measurements on the soil solution extracts or electrolyte solutions,but are also widely used on soils.The application of these models in soils with different textures may be questioned.Five types of soils with different textures in Pearl River Delta,including sandy soil,silty sand,silt,silty loam,and clay loam,are obtained to investigate the influence of temperature on soil electrical resistivity.The temperature varies from 5 to 45 °C,and the soil electrical resistivity is measured by the AC voltammetry method in Miller soil box with four-electrode configuration.Our study shows that most of the existing models,parameterized from data on soil solution extracts or electrolyte solutions,have limits of validity on the results of our laboratory experiments on soil samples.From our experimental data,four types of temperature correction models,of which the parameters depend on the soil textures,are determined at first by nonlinear regression analysis.However,the power function model is not proposed here since it is not suitable to describe the relationship between the soil resistivity and the temperature in the wide range of 5 to 45 °C.Then the uniform forms of the ratio model,exponential model and polynomial model independent of soil textures are developed and perform well on the soil data.

关 键 词：电阻率 电导率 温度修正模型 土壤温度 土壤质地 非线性回归 

分 类 号：TM934.1[电气工程—电力电子与电力传动]