Philip公式确定吸渗率时间尺度研究

付秋萍; 王全九; 樊军

付秋萍,王全九,樊军.Philip公式确定吸渗率时间尺度研究[J].干旱地区农业研究,2009,27(4):65~70

Philip公式确定吸渗率时间尺度研究

Study on the time scales of soil sorptivety determined by Philip equation

DOI：10.7606/j.issn.1000-7601.2009.04.13

中文关键词: 盘式吸渗仪吸渗率 Philip公式

英文关键词:disc infiltrometer soil sorptivety Philip equation

基金项目:国家重点基础研究发展计划（973计划）(2005CB121103)；国家自然基金项目(50879067)

作者	单位
付秋萍	中国科学院水利部水土保持研究所，西北农林科技大学水土保持研究所，黄土高原土壤侵蚀与旱地农业国家重点实验室，陕西杨凌 712100；中国科学院研究生院，北京 100039
王全九	中国科学院水利部水土保持研究所，西北农林科技大学水土保持研究所，黄土高原土壤侵蚀与旱地农业国家重点实验室，陕西杨凌 712100；西安理工大学，陕西西安 710048
樊军	中国科学院水利部水土保持研究所，西北农林科技大学水土保持研究所，黄土高原土壤侵蚀与旱地农业国家重点实验室，陕西杨凌 712100

摘要点击次数: 162

全文下载次数: 128

中文摘要:

选用直径5 cm和10 cm的盘式吸渗仪，对杨凌土（粘土）和神木砂黄土（砂壤土）两种质地的土壤在1 cm、3 cm、6 cm、9 cm和12 cm水头5种负压下进行了室内盘式吸渗仪三维吸渗实验，选取Vandervaere公式作为参考模型，对Philip公式确定吸渗率的时间尺度选取进行了分析。结果表明，对两种质地的土壤，在相同盘径下，随着负压的降低，吸渗率随之减小；在相同负压下，盘径越小，吸渗率越大；质地较砂的砂黄土吸渗率明显大于质地较粘的土的吸渗率。从相对误差来看，两种质地土壤吸渗率均被高估；在同一盘径下，随着负压的减小，误差值逐渐降低；即在选取的时间范围内，负压越低，计算吸渗率的准确性越高。对土而言，5 cm盘径下-12 cm水头、10 cm盘径下-9 cm水头和-12 cm水头时确定吸渗率的适宜时间分别为30～40 s和40～50 s；其余确定吸渗率的适宜时间均应小于30 s；对砂黄土而言，10 cm盘径下-9 cm水头和-12 cm水头时确定吸渗率的适宜时间分别为30～40 s和40～50 s，其余确定吸渗率的适宜时间也均应小于30 s。对于质地较砂的土壤推荐使用大盘径进行盘式吸渗仪实验。

英文摘要:

Two diameters of disc infiltrometer (5 cm and 10 cm) and two distinctly textured soil (Yangling caly soil and Shenmu sandy loam soil) were used to carry out disc 3D laboratory infiltration experiment under five pressure heads(-1，-3，-6，-9，-12 cm H₂O). Vandervaere formula was chosen as standard model, and then the time scales of determining soil sorptivety by Philip formula were analyzed according to Vandervaere equation. The results are as followed， for the two textured soil, soil sorptivety reduces as pressure heads decrease at the same disc diameter; soil sorptivety becomes bigger as the disc diameter gets smaller. The soil sorptivety of Shenmu soil is obviously bigger than that of Yangling. The soil sorptivety of the two kinds of soil is nearly overrated. The overrated values of soil sorptivety decrease as pressure heads reduce. That is to say, the veracity of estimating soil sorptivety is higher as pressure heads become smaller within the chosen time. For Yangling soil, the proper time scales of determining soil so rptivety by Philip equation under the situation that the disc diameter is 5cm with -12 cm H₂O and the disc diameter is 10 cm with -9 cm H₂O and -12 cm H₂O are 30～40 s and 40～50 s respectively, while the proper time scales in other situation should be less than 30 s. For Shenmu soil, the proper time scales of determining soil sorptivety by Philip equation under the situation that the disc d iameter is 10 cm with -9 cm H₂O and -12 cm H₂O are 30～40 s and 40～50 s res pectively, while the proper time scales in other situation should be less than 30 s too. The bigger diameter of disc infiltometer is recommended to determine soil sorptivety for the light soil.

查看全文查看/发表评论下载PDF阅读器