Spatial and depth variability of streambed vertical hydraulic conductivity under the regional flow regimes

2018 ◽  
Vol 32 (19) ◽  
pp. 3006-3018 ◽  
Author(s):  
Jinxi Song ◽  
Liping Wang ◽  
Xinyi Dou ◽  
Fangjian Wang ◽  
Hongtao Guo ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Flow Regimes ◽  
Regional Flow ◽  
Vertical Hydraulic Conductivity ◽  
Streambed Vertical Hydraulic Conductivity

Effect of temperature on streambed vertical hydraulic conductivity

2013 ◽  
Vol 45 (1) ◽  
pp. 89-98 ◽  
Author(s):  
Weihong Dong ◽  
Gengxin Ou ◽  
Xunhong Chen ◽  
Zhaowei Wang
Keyword(s):  
Hydraulic Conductivity ◽  
Water Temperature ◽  
Sediment Cores ◽  
Effect Of Temperature ◽  
In Situ Tests ◽  
Effect Of Water ◽  
Vertical Hydraulic Conductivity ◽  
Increasing Trend ◽  
Streambed Vertical Hydraulic Conductivity

In this study, in situ and on-site permeameter tests were conducted in Clear Creek, Nebraska, USA to evaluate the effect of water temperature on streambed vertical hydraulic conductivity Kv. Fifty-two sediment cores were tested. Five of them were transferred to the laboratory for a series of experiments to evaluate the effect of water temperature on Kv. Compared with in situ tests, 42 out of the 52 tests have higher Kv values for on-site tests. The distribution of water temperature at the approximately 50 cm depth of streambed along the sand bar was investigated in the field. These temperatures had values in the range 14–19 °C with an average of 16 °C and had an increasing trend along the stream flow. On average, Kv values of the streambed sediments in the laboratory tests increase by 1.8% per 1 °C increase in water temperature. The coarser sandy sediments show a greater increase extent of the Kv value per 1 °C increase in water temperature. However, there is no distinct increasing trend of Kv value for sediment containing silt and clay layers.

scholarly journals The Effect of River Valleys and the Upper Cretaceous Aquitard on Regional Flow in the Dakota Aquifer in the Central Great Plains of Kansas and Southeastern Colorado

1995 ◽  
pp. 11-30
Author(s):  
P. Allen Macfarlane
Keyword(s):  
Hydraulic Conductivity ◽  
Great Plains ◽  
Upper Cretaceous ◽  
Flow System ◽  
Arkansas River ◽  
Local Flow ◽  
Discharge Area ◽  
Regional Flow ◽  
Regional Hydrogeology ◽  
Vertical Hydraulic Conductivity

In his reports on the regional hydrogeology of the central Great Plains, in particular southeastern Colorado and southwestern and central Kansas, Darton considered the Dakota aquifer to be a classic example of an artesian system. Computer simulations of the flow system in this study, however, suggest that the Dakota is not a regional artesian aquifer in the classic sense. Sensitivity analysis of a steady-state vertical profile flow model demonstrates that the flow system in the upper Dakota in western Kansas is heavily influenced by the Upper Cretaceous aquitard, the Arkansas River in southeastern Colorado, and rivers in central Kansas, such as the Saline, that have eroded through the aquitard and into the Dakota to the west of the main outcrop area of the aquifer. The model shows that local flow systems and the vertical hydraulic conductivity of the Upper Cretaceous aquitard heavily influence the water budget and the flow patterns. The aquitard restricts recharge from the overlying water table to underlying aquifers in western Kansas because of its considerable thickness and low vertical hydraulic conductivity. The Arkansas River intercepts ground-water flow moving toward western Kansas from recharge areas south of the river and further isolates the upper Dakota from sources of freshwater recharge. In central Kansas, the Saline River has reduced the distance between confined portions of the aquifer and its discharge area. In essence, this has improved the hydraulic connection between the confined aquifer and its discharge area, thus helping to generate subhydrostatic conditions in the upper Dakota upgradient of the river.

scholarly journals Effects of hyporheic processes on streambed vertical hydraulic conductivity in three rivers of Nebraska

2007 ◽  
Vol 34 (7) ◽  
Author(s):  
Jinxi Song ◽  
Xunhong Chen ◽  
Cheng Cheng ◽  
Scott Summerside ◽  
Fujiang Wen
Keyword(s):  
Hydraulic Conductivity ◽  
Vertical Hydraulic Conductivity ◽  
Streambed Vertical Hydraulic Conductivity ◽  
Three Rivers

scholarly journals Statistical Distribution of Streambed Vertical Hydraulic Conductivity along the Platte River, Nebraska

2010 ◽  
Vol 25 (1) ◽  
pp. 265-285 ◽  
Author(s):  
Cheng Cheng ◽  
Jinxi Song ◽  
Xunhong Chen ◽  
Deming Wang
Keyword(s):  
Hydraulic Conductivity ◽  
Statistical Distribution ◽  
Platte River ◽  
Vertical Hydraulic Conductivity ◽  
Streambed Vertical Hydraulic Conductivity

scholarly journals Accelerated gravity testing of aquitard core permeability and implications at formation and regional scale

2015 ◽  
Vol 12 (3) ◽  
pp. 2799-2841
Author(s):  
W. A. Timms ◽  
R. Crane ◽  
D. J. Anderson ◽  
S. Bouzalakos ◽  
M. Whelan ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Preferential Flow ◽  
Fluid Velocity ◽  
Regional Scale ◽  
Geotechnical Centrifuge ◽  
Regional Flow ◽  
Clayey Silt ◽  
Vertical Hydraulic Conductivity ◽  
Core Permeability

Abstract. Evaluating the possibility of leakage through low permeability geological strata is critically important for sustainable water supplies, the extraction of fuels from strata such as coal beds, and the confinement of waste within the earth. The current work demonstrates that relatively rapid and reliable hydraulic conductivity (K) measurement of aquitard cores using accelerated gravity can inform and constrain larger scale assessments of hydraulic connectivity. Steady state fluid velocity through a low K porous sample is linearly related to accelerated gravity (g-level) in a centrifuge permeameter (CP) unless consolidation or geochemical reactions occur. The CP module was custom designed to fit a standard 2 m diameter geotechnical centrifuge (550 g maximum) with a capacity for sample dimensions of 30 to 100 mm diameter and 30 to 200 mm in length, and a maximum total stress of ~2 MPa at the base of the core. Formation fluids were used as influent to limit any shrink–swell phenomena which may alter the permeability. Vertical hydraulic conductivity (Kv) results from CP testing of cores from three sites within the same regional clayey silt formation varied (10−7 to 10−9 m s−1, n = 14). Results at one of these sites (1.1 × 10−10 to 3.5 × 10−9 m s−1, n = 5) that were obtained in < 24 h were similar to in situ Kv values (3 × 10−9 m s−1) from pore pressure responses over several weeks within a 30 m clayey sequence. Core scale and in situ Kv results were compared with vertical connectivity within a regional flow model, and considered in the context of heterogeneity and preferential flow paths at site and formation scale. More reliable assessments of leakage and solute transport though aquitards over multi-decadal timescales can be achieved by accelerated core testing together with advanced geostatistical and numerical methods.

scholarly journals Erratum: Spatial variability of streambed vertical hydraulic conductivity and its relation to distinctive stream morphologies in the Beiluo River, Shaanxi Province, China

2015 ◽  
Vol 23 (7) ◽  
pp. 1627-1627
Author(s):  
Weiwei Jiang ◽  
Jinxi Song ◽  
Junlong Zhang ◽  
Yuanyuan Wang ◽  
Nan Zhang ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Spatial Variability ◽  
Shaanxi Province ◽  
Vertical Hydraulic Conductivity ◽  
Streambed Vertical Hydraulic Conductivity

Spatial variability of streambed vertical hydraulic conductivity and its relation to distinctive stream morphologies in the Beiluo River, Shaanxi Province, China

2015 ◽  
Vol 23 (7) ◽  
pp. 1617-1626 ◽  
Author(s):  
Weiwei Jiang ◽  
Jinxi Song ◽  
Junlong Zhang ◽  
Yuanyuan Wang ◽  
Nan Zhang ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Spatial Variability ◽  
Shaanxi Province ◽  
Vertical Hydraulic Conductivity ◽  
Streambed Vertical Hydraulic Conductivity

The spatial variability of streambed vertical hydraulic conductivity in an intermittent river, northwestern China

2012 ◽  
Vol 69 (3) ◽  
pp. 873-883 ◽  
Author(s):  
Leilei Min ◽  
Jingjie Yu ◽  
Changming Liu ◽  
Juntao Zhu ◽  
Ping Wang
Keyword(s):  
Hydraulic Conductivity ◽  
Spatial Variability ◽  
Northwestern China ◽  
Vertical Hydraulic Conductivity ◽  
Streambed Vertical Hydraulic Conductivity ◽  
Intermittent River
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