Hydrological exchange and subsurface water chemistry in streams varying in salinity in south-western Australia

1999 ◽  
Vol 8 (4) ◽  
pp. 361-382 ◽  
Author(s):  
A. J. Boulton ◽  
P. Marmonier ◽  
J. A. Davis
Keyword(s):  
Water Chemistry ◽  
Western Australia ◽  
Subsurface Water ◽  
Hydrological Exchange

Streams as mirrors: reading subsurface water chemistry from stream chemistry

2021 ◽  
Author(s):  
Bryn Stewart ◽  
James B. Shanley ◽  
James W. Kirchner ◽  
David Norris ◽  
Thomas Adler ◽  
...  
Keyword(s):  
Water Chemistry ◽  
Subsurface Water ◽  
Stream Chemistry

Dynamic analysis of stream flow and water chemistry to infer subsurface water and nitrate fluxes in a lowland dairying catchment

2013 ◽  
Vol 505 ◽  
pp. 299-311 ◽  
Author(s):  
Simon J.R. Woodward ◽  
Roland Stenger ◽  
Vincent J. Bidwell
Keyword(s):  
Dynamic Analysis ◽  
Water Chemistry ◽  
Stream Flow ◽  
Subsurface Water

Developing land use strategies in landscapes with changing priority, the case of peatland management

2020 ◽  
Author(s):  
Stephen Monteverde ◽  
Mark Healy ◽  
Oisín Callery
Keyword(s):  
Remote Sensing ◽  
Land Use ◽  
Water Chemistry ◽  
Water Level ◽  
Single Point ◽  
Water Flux ◽  
Water Levels ◽  
Mitigation Measures ◽  
Subsurface Water ◽  
Strong Control

<p>Globally, peatlands experience water storage fluctuations. Seasonality was once the sole contributor of this natural water table variation, however, for many years, freshwater drainage of peatlands for agriculture, afforestation, and energy production has been prevalent. With constant changes in storage, there exists a measurable connection between subsurface water levels and solute transport in the deep layers of peatland material. Traditionally, water level modelling has benefitted environmental protection schemes with the identification of critically important areas and by implementing relevant hydraulic structures for optimal protection. Restoration and rehabilitation efforts occurring in the last several decades have occasionally highlighted results of miscalculation, whereby a peatland’s capacity to alleviate water flux effects was overestimated in degraded regions. Once a peat layer becomes dry and aerated, it decomposes, releasing nitrogen and other nutrients into the environment. Conversely, if a peatland is inundated beyond its storage capacity, aggregates of peat and vegetation become suspended within the excess water, signifying the potential for an increased methane flux.</p><p>In spite of an ideal water level, one that satisfies a degraded condition while preventing excess flooding, research must continue to expand upon land use and management activities and how they affect hydrology and water quality parameters across a given peatland. To quantify geochemical and hydrological properties given the scale of highly variable peat parameters, many studies have relied on single point data to represent peatlands. Since water chemistry has a strong control on geophysics in peatland environments, a remote sensing technique was used in this study to qualitatively describe the surface of a cutaway peatland. Qualitative analysis of the study site describes soil moisture and peat depth through a geophysical interpretation and an ability to detect gamma radiation<span>.</span></p><p>Remote sensing data, acquired by the Geological Survey Ireland, was used to capture radiometric variation at the study site. The airborne survey data was used to identify suitable locations on the study site in which to collect representative soil cores, which were then brought to the laboratory for analysis. The results from laboratory-based hydrological testing of these cores will be used to quantify the impacts of various water management regimes on site. By combining geophysical analysis with laboratory measurements of soil and water chemistry, there is an opportunity for improving upon the development of suitable mitigation measures.</p>

Persistence of giants: population dynamics of the limpet Scutellastra laticostata on rocky shores in Western Australia

2020 ◽  
Vol 646 ◽  
pp. 79-92
Author(s):  
RE Scheibling ◽  
R Black
Keyword(s):  
Population Dynamics ◽  
Western Australia ◽  
Size Structure ◽  
Survival Rates ◽  
Maximum Size ◽  
High Rate ◽  
Adult Survival ◽  
Rocky Shores ◽  
Adult Size ◽  
Decadal Time Scale

Population dynamics and life history traits of the ‘giant’ limpet Scutellastra laticostata on intertidal limestone platforms at Rottnest Island, Western Australia, were recorded by interannual (January/February) monitoring of limpet density and size structure, and relocation of marked individuals, at 3 locations over periods of 13-16 yr between 1993 and 2020. Limpet densities ranged from 4 to 9 ind. m-2 on wave-swept seaward margins of platforms at 2 locations and on a rocky notch at the landward margin of the platform at a third. Juvenile recruits (25-55 mm shell length) were present each year, usually at low densities (<1 m-2), but localized pulses of recruitment occurred in some years. Annual survival rates of marked limpets varied among sites and cohorts, ranging from 0.42 yr-1 at the notch to 0.79 and 0.87 yr-1 on the platforms. A mass mortality of limpets on the platforms occurred in 2003, likely mediated by thermal stress during daytime low tides, coincident with high air temperatures and calm seas. Juveniles grew rapidly to adult size within 2 yr. Asymptotic size (L∞, von Bertalanffy growth model) ranged from 89 to 97 mm, and maximum size from 100 to 113 mm, on platforms. Growth rate and maximum size were lower on the notch. Our empirical observations and simulation models suggest that these populations are relatively stable on a decadal time scale. The frequency and magnitude of recruitment pulses and high rate of adult survival provide considerable inertia, enabling persistence of these populations in the face of sporadic climatic extremes.

ANALISIS KESTABILAN LERENG DINDING AKHIR DI PIT BARATLAUT PADA PENAMBANGAN BATUBARA DI PT. PUTERA BARA MITRA , KECAMATAN MENTEWE, KALIMANTAN SELATAN

KURVATEK ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 21-34
Author(s):  
Untung Wahyudi ◽  
Excelsior T P ◽  
Luthfi Wahyudi
Keyword(s):  
Slope Stability ◽  
Mining Operation ◽  
Subsurface Water ◽  
Mining System ◽  
Mine Site ◽  
Analysis And Design ◽  
The Stability ◽  
End Wall ◽  
Wall Slope ◽  
Mining Slope

PT. Putera Bara Mitra used open mining system for mining operation, Yet the completion of study on the end wall slope stability that  undertaken by geotechnical PT. Putera Bara Mitra in Northwest Pit and the occured a failure in the low wall on the 1st June 2012 led to the need for analysis and design the overall slope at the mine site. To analyze and design the overall slope, used value of the recommended minimum safety. The value was based on company for single slope SF ≥ 1.2 and SF ≥ 1.3 for overall slope. The calculation used Bichop method with the help of software slide v 5.0. Geometry improvements was done at the low slopes that originally single wall with a 30 m bench height and a slope 70° with SF = 0.781, into 4 levels with SF = 1.305. The analysis explained the factors that affect the stability of the low wall included the mining slope geometry, unfavorable drainase system, material stockpiles and seismicity factors. It was necessary to do prevention efforts to maintain the stability of the slope included the redesign to slope geometry, handling surface and subsurface water in a way to control slopes draining groundwater, vegetation stabilization using and monitoring slope using Total Station with Prism and Crackmeter to determine the movement of cracks visible on the surface. 

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