Horizontal hydraulic conductivity of shallow streambed sediments and comparison with the grain-size analysis results

2011 ◽  
Vol 26 (3) ◽  
pp. 454-466 ◽  
Author(s):  
Chengpeng Lu ◽  
Xunhong Chen ◽  
Cheng Cheng ◽  
Gengxin Ou ◽  
Longcang Shu
Keyword(s):  
Grain Size ◽  
Hydraulic Conductivity ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Streambed Sediments

scholarly journals Grain Size and Heavy Minerals Analysis of Maastrichtian Sandstone, Anambra Basin, Nigeria: Implication for Aquifer Properties

2020 ◽  
Vol 24 (11) ◽  
pp. 1881-1888
Author(s):  
M Ilevbare ◽  
OI Imasuen
Keyword(s):  
Grain Size ◽  
Drinking Water ◽  
Hydraulic Conductivity ◽  
Heavy Minerals ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Grain Sizes ◽  
Anambra Basin ◽  
Aquifer Geometry ◽  
Aquifer Properties

The Maastrichtian sediments of Anambra Basin, south western Nigeria was studied for grain characteristics and maturity of the sediments, so that by combining sedimentological characteristics, maturity and its paleoenvironment of deposition of the Ajali sandstone, in order to ascertain the aquifer properties of the groundwater within the study area and by extension the availability of drinking water for both the urban and rural settlers. Grain size analysis (51 samples) and heavy mineral analysis (15 samples each) were analyzed. The textural parameters show that the Sandstone are medium sand, poorly to moderately sorted, coarse to strongly coarse skewed with mesokurtic to leptokurtic grains. The heavy minerals present in lithologic sand and sandstone units of Ajali Formation are mainly zircon, rutile, tourmaline, apatite, staurolite, and opaque minerals (Goethite, hematite, ilmenite), these heavy minerals found in the sandstone are associated with igneous and metamorphic source which indicates that these maastritchian sediments are from basement complex rock The ZTR index of 67.96% and the values of the kurtosis indicates a sub-mature sandstone to mature sandstone, which gives an excellent aquifer properties. Also, the paleoenvironment of deposition of the Maastrichtian sediments is Fluvial. The sand and sandstone bodies deposited in a fluvial system have sheet-like geometries and due to the differences in the extent of aquifer compartmentalization, Sandstone deposited in fluvial environment normally has better hydraulic conductivity which again reveals a good aquifer property. The sedimentological characteristics for the Sandstone exposed at Fugar and environs, is a coarsening upward sequence (increasing grain sizes) with a progressive increase in sorting. since hydraulic conductivity increases with increasing grain sizes and sorting, hence, excellent aquifer characteristics for the groundwater within the study area. The foregoing revealed that the aquifer geometry and properties of the study areas is favourable for the availability of drinking water for both the Urban and rural dwellers within these communities. Keywords: Aquifer geometry, groundwater, hydraulic conductivity, Anambra Basin

scholarly journals Reconsideration at Field Scale of the Relationship between Hydraulic Conductivity and Porosity: The Case of a Sandy Aquifer in South Italy

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Carmine Fallico
Keyword(s):  
Grain Size ◽  
Hydraulic Conductivity ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Effective Porosity ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Strict Sense ◽  
Field Scale

To describe flow or transport phenomena in porous media, relations between aquifer hydraulic conductivity and effective porosity can prove useful, avoiding the need to perform expensive and time consuming measurements. The practical applications generally require the determination of this parameter at field scale, while most of the empirical and semiempirical formulas, based on grain size analysis and allowing determination of the hydraulic conductivity from the porosity, are related to the laboratory scale and thus are not representative of the aquifer volumes to which one refers. Therefore, following the grain size distribution methodology, a new experimental relation between hydraulic conductivity and effective porosity, representative of aquifer volumes at field scale, is given for a confined aquifer. The experimental values used to determine this law were obtained for both parameters using only field measurements methods. The experimental results found, also if in the strict sense valid only for the investigated aquifer, can give useful suggestions for other alluvial aquifers with analogous characteristics of grain-size distribution. Limited to the investigated range, a useful comparison with the best known empirical formulas based on grain size analysis was carried out. The experimental data allowed also investigation of the existence of a scaling behaviour for both parameters considered.

Feasibility of grain-size analysis methods for determination of vertical hydraulic conductivity of streambeds

2009 ◽  
Vol 375 (3-4) ◽  
pp. 428-437 ◽  
Author(s):  
Jinxi Song ◽  
Xunhong Chen ◽  
Cheng Cheng ◽  
Deming Wang ◽  
Susan Lackey ◽  
...  
Keyword(s):  
Grain Size ◽  
Hydraulic Conductivity ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Analysis Methods ◽  
Vertical Hydraulic Conductivity
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