A new and simple method for measuring in situ field-saturated hydraulic conductivity using a falling-head single cylinder
A new and simple method for measuring in situ field-saturated hydraulic conductivity using a falling-head single cylinder
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一种使用落头单缸现场测量现场饱和导水率的新而简单的方法
DOI：
10.1007/s10333-017-0617-8
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发表时间：
2018
影响因子：
2.2
通讯作者：
and M. Mizoguchi
中科院分区：
文献类型：
--
作者：
Noborio;K.;Y. Ito;H. He;M. Li;Y. Kojima;H. Hara;and M. Mizoguchi
土壤水力学性质在水、温动态中起着重要作用。测量水力特性已经在实验室和现场研究了几十年。1989年，引入了圭尔夫渗透仪来测量现场饱和导水率Kfs，但它需要一个经验常数。直到最近，没有程序已被引入到原位测量Kfs没有经验常数。在本文中，我们提出了一种新的简单的方法来测量Kfs。使用金属圆柱体（30 cm长，内径4.5 cm）或PVC圆柱体（30 cm长，内径5.0 cm）安装到土壤中5 cm深，对火山灰源关东壤土、黄土和丰浦砂进行现场和实验室测量。用激光测量仪测量了缸内水深或水头的时间变化。用该方法测得的Kfs值与实验室测得的原状土样饱和导水率值吻合较好。新的分析解决方案，为未来的自动化设备，用于此目的。
Hydraulic properties of soil play important roles in water and temperature regimes. Measuring hydraulic properties has been studied for decades in the laboratory and in the fields. In 1989 the Guelph Permeameter was introduced to measure in situ field-saturated hydraulic conductivity,Kfs, but it required an empirical constant. Until recently, no procedure had been introduced to in situ measureKfswithout an empirical constant. In this article, we proposed a new simple method to measureKfs. Field and laboratory measurements for volcanic ash origin Kanto loam, loess, and Toyoura sand were taken using a metallic cylinder (30 cm long and 4.5 cm inner diameter) or a PVC cylinder (30 cm long and 5.0 cm inner diameter) installed into soil down to a 5 cm depth. Temporal changes in water depth or hydraulic head inside the cylinder were measured with a laser measure. Values ofKfsmeasured with this proposed method agreed well with saturated hydraulic conductivity measured in the laboratory for undisturbed soil cores. New analytical solution was derived for a future automated device for this purpose.