Design and development of a simple and easy-to-measure in-situ permeability test to determine hydraulic conductivity of soil.

设计和开发一种简单且易于测量的原位渗透性测试，以确定土壤的水力传导率。

基本信息

批准号：
12556036
负责人：
MORII Toshihiro
金额：
$ 5.44万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

It is well recognized that in-situ measurements of saturated and unsaturated moisture properties of soil are essential for accurate prediction of contaminant transport as well as water movement in soil such as agricultural field, compacted soil, natural slope and landfill. In the Research Project field and laboratory investigations are conducted to develop an in-situ permeability test that has a superior feature that an equipment to measure data as well as a procedure to determine the soil permeability is quite simple. The in-situ permeability test investigated consists of a Guelph pressure infiltrometer (GPI) method combined with a Guelph well permeameter (GWP) method, both of which have been proposed by the researchers of Guelph University, Canada. The GPI and GWP methods determine a field-saturated hydraulic conductivity of soil Kfs based on a measurement of constant-head steady infiltration into a soil from a single ring inserted a small depth into the soil and from a well bored a … More small depth into the soil, respectively. Kfs can describe well water movement in soil because many natural and man-made infiltration processes result in significant air entrapment within the soil.In the first and second years of the Research Project, a practical accuracy and an applicability of the GPI and the GWP methods were examined by a field investigation, a laboratory soil bin test and a numerical analysis. If is found out that the GPI and the GWP methods determine accurately and effectively Kfs in plane and along depth of soil, respectively. Also is found that a statistical property of the soil permeability can be determined,effectively by the GPI method because it does not require a tedious time to determine Kfs at a site. The in-situ permeability test investigated was applied to sand sediment soil formed by a debris flow of soil. From the test results and a permeability test of the sand sediment soil additionally conducted in the laboratory, an integrated procedure is effectively proposed to determine the hydraulic permeability of the sand sediment which is characterized by a inclusion of large gravel and cobbles into the sand soil. In the last year of the Research Project, the in-situ permeability test was extended so that it was able to determine unsat urated moisture properties of soil as well as the hydraulic conductivity of soil. Both an infiltration rate from the GPI ring or the GWP well and a moisture content of soil were measured during the constant-head infiltration with time, and were numerically back-calculated to estimate soil parameters which defined optimally unique relationships between moisture content, negative pressure head and unsaturated hydraulic conductivity of soil. Less

Weelle认识到，土壤的原位水分特性对于准确的污染物运输至关重要当我们作为ASA程序确定土壤通透性的过程非常简单。加拿大圭尔夫·泰（Guelph Ty）的研究人员提出的是，GPI和GWP方法基于将面积头浸入单个环的测量中，确定了土壤KFS的现场饱和水力行为，分别是将一个小的深度浸入土壤和一些。 KFS可以描述土壤中的水分流动，因为许多天然和人工浸润在研究项目Curacy的第一年和第二年都显着地存在于空气中，并且GPI和GPI的适用性和GWP方法是通过野外投资检查的，一项现场投资，一种发现GPID的实验室Souil bin测试和数值分析确定了沿着Elso深度的kF，可以通过GPI方法有效地确定土壤通透性的统计特性，因为它不需要时间为了确定KF的原位渗透性测试。在研究项目的最后一年中，确定特征的砂沉积物的水分渗透性是特征。能够从GPI戒指或GWP井中的离子速率作为辛苦的劳动特性，并在恒定的渗透过程中测量了Soile的水分含量定义的最佳独特关系，含量为负的头部和土壤的不饱和液压性能。