NDLI: Determination of the anisotropy of an upper streambed layer in east-central Nebraska, USA

Content Provider	Springer Nature Link
Author	Lu, Chengpeng Chen, Xunhong Ou, Gengxin Cheng, Cheng Shu, Longcang Cheng, Donghui Appiah Adjei, Emmanuel Kwame
Copyright Year	2011
Abstract	Information on the anisotropy of streambed hydraulic conductivity (K) is a necessity for analyses of water exchange and solute transport in the hyporheic zone. An approach is proposed for the determination of K, developed from existing in-situ permeameter test methods. The approach is based on determination of vertical and horizontal hydraulic conductivity of streambed sediments on-site and eliminates the effects of vertical flow in the hyporheic zone and stream-stage fluctuation, which normally influence in situ permeameter tests. The approach was applied to seven study sites on four tributaries of the Platte River in east-central Nebraska, USA. On-site permeameter tests conducted on about 172 streambed cores for the determination of vertical hydraulic conductivity (K $_{v}$) and horizontal hydraulic conductivity (K $_{h}$) at the study sites indicate that the study sites have relatively small anisotropic ratios, ranging from 0.74 to 2.40. The ratios of K $_{h}$ to K $_{v}$ from individual locations within a study site show greater variation than the anisotropic ratios from the mean or median K at each of the study sites.L’information sur l’anisotropie de la conductivité hydraulique (K) est nécessaire pour les analyses d’échange d’eau et de transport de soluté dans la zone hyporhéique. Une démarche est proposée pour la détermination de K, dérivée de méthodes existantes de test au perméamètre in situ. La démarche est basée sur la détermination sur site des conductivités hydrauliques verticale et horizontale des sédiments du lit et élimine les effets du flux vertical dans la zone hyporhéique et de la fluctuation du niveau d’eau, qui influencent normalement les tests perméamètre in situ. La démarche a été menée sur sept sites d’étude sur quatre tributaires de la Platte River, Centre-Est Nebraska, USA. Des tests de perméabilité sur site réalisés sur environ 172 carottes pour la détermination des conductivités hydrauliques verticale (K $_{v}$) et horizontale (K $_{h}$) indiquent des ratios d’anisotropie relativement petits, s’échelonnant de 0.74 à 2.40. Les ratios de K $_{h}$ sur K $_{v}$ mesurés sur différents emplacements d’un même site montrent une plus grande variabilité que les ratios d’anisotropie de la moyenne ou de la médiane de K sur chacun de ces sites d’étude.La información sobre la anisotropía de la conductividad hidráulica de un cauce (K) es una necesidad para los análisis del intercambio de agua y transporte de solutos en una zona hiporreica. Se propone un método para la determinación de K, desarrollado a partir de métodos de prueba in situ en permeámetros existentes. El método está basado en la determinación de la conductividad hidráulica vertical y horizontal de los sedimentos del cauce en el sitio y elimina los efectos del flujo vertical en la zona hiporreica y las fluctuaciones del estado de la corriente, la cual normalmente influye en las pruebas in situ con los permeámetros. El método fue aplicado en siete sitios de estudio en cuatro tributarios del Platte River en el centro este de Nebraska, EEUU. En los lugares de las pruebas en los permeámetros se llevaron a cabo 172 testigos en el cauce para la determinación de la conductividad hidráulica vertical (K $_{v}$) y la conductividad hidráulica horizontal (K $_{h}$) en los sitios de estudios indican que los sitios de estudio tienen un cociente de anisotropía relativamente pequeña, oscilando de 0.74 a 2.40. Los cocientes de K $_{h}$ a K $_{v}$ a partir de lugares individuales dentro del sitio de estudio muestran mayores variaciones que los cocientes de anisotropía a partir de la K media o mediana en cada uno de los sitios estudiados.河床渗透系数的各向异性比是进行河流潜流带水量交换和溶质运移分析时必不可少的重要信息。本文提出一种测定河床渗透系数的改进渗透方法,该方法是基于原位渗透试验的改进。改进试验中采用非原位操作方法,避免了河水位波动和河流潜流带垂向流对原位试验的影响。本研究采用改进的非原位渗透试验方法分别应用在美国内布拉斯加州中东部普拉特河的四条支流上的七个试验场地。非原位渗透试验共计测定172组河床砂样的垂向渗透系数(K $_{ v }$)和水平渗透系数(K $_{h}$)。结果表明这些试验场地具有较弱的各向异性特征,各向异性比介于0.74和2.40之间。在任意试验场地内,每个试验位置上的K $_{h}$/K $_{v}$值与使用该场地的K $_{h}$与K $_{v}$的平均值(或中位数)得到的各向异性比相比,具有更大的变异性。A informação acerca da anisotropia da condutividade hidráulica (K) do sedimento do leito de rios é uma necessidade para as análises de trocas de água e transporte de solutos na zona hiporreica. Propõe-se uma metodologia para determinar K, desenvolvida a partir de métodos existentes de ensaios de permeâmetro in situ. A metodologia é baseada na determinação, no local, da condutividade hidráulica vertical e horizontal de sedimentos do leito de rios e elimina os efeitos do fluxo vertical na zona hiporreica e da flutuação do nível do rio, que normalmente influenciam os ensaios de permeâmetro in situ. A metodologia foi aplicada a sete casos de estudo em quatro afluentes do rio Platte no Centro-este de Nebraska, nos EUA. Os ensaios de permeâmetro in situ, feitos em cerca de 172 sondagens em sedimentos dos leitos de rios, para a determinação da condutividade hidráulica vertical (K $_{v}$) e condutividade hidráulica horizontal (K $_{h}$) indicam que as zonas de estudo têm rácios de anisotropia relativamente baixos, variando entre 0.74 e 2.40. Os rácios entre K $_{h}$ e K $_{v}$ de locais individuais dentro de uma zona de estudo mostram uma variação maior do que os rácios de anisotropia da K média ou mediana em cada uma das zonas de estudo.
Starting Page	93
Ending Page	101
Page Count	9
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	20
Issue Number	1
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2011-10-11
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anisotropy Upper streambed layer Hydraulic properties Permeameter test USA Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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