Laboratory rainfall simulator studies of selected open-cut coal mine overburden spoils from Central Queensland

Soil Research ◽  
1997 ◽  
Vol 35 (1) ◽  
pp. 15 ◽  
Author(s):  
K. G. Evans ◽  
R. J. Loch ◽  
T. O. Aspinall ◽  
L. C. Bell
Keyword(s):  
Coal Mine ◽  
Prediction Models ◽  
Agricultural Soils ◽  
Rainfall Simulation ◽  
Soil Parameters ◽  
Mine Spoils ◽  
Erosion Prediction ◽  
Show Evidence ◽  
Parameter Values ◽  
Study Laboratory

Data on the erodibility of overburden spoils resulting from open-cut coal mining are limited. These data are required to derive parameters for erosion prediction models which can be used in the design of re-formed landscapes after mining. In this study, laboratory rainfall simulation data were used to derive CREAMS (Chemicals, Runoff and Erosion from Agricultural Management Systems) interrill erodibility parameters K and nbov for Central Queensland coal mine overburden spoils. For the spoils studied, K values ranged from 0·0111 to 0·1398 Mg·ha·h/(ha·MJ·mm) and nbov values ranged from 0·0004 to 0·0081. Sediment yield was transport controlled. Results for 1 spoil, South Blackwater Terang, showed that total soil loss increased linearly with slope, and both K and nbov varied non-linearly with slope. If a constant set of K and nbov values is used in modelling, CREAMS over-predicts spoil loss for slopes greater than that for which the parameter values were determined, and under-predicts spoil loss for slopes less than that for which the parameter values were determined. The results show evidence of differences between mine spoils and agricultural soils, including modality of size distribution of surface sediment available for erosion, a higher percentage of dispersed clays in eroded sediment from mine spoils than from agricultural soils, and the observed amount of surface sealing and crust formation. These differences indicate that erosion{erodibility parameters for mine spoils should be measured and that agricultural soil parameters should not be a basis for estimates of mine spoil parameters.

scholarly journals Wood creep data collection and unbiased parameter identification of compliance functions

Holzforschung ◽  
2020 ◽  
Vol 74 (11) ◽  
pp. 1011-1020
Author(s):  
Danyang Tong ◽  
Susan Alexis Brown ◽  
David Corr ◽  
Gianluca Cusatis
Keyword(s):  
Parameter Identification ◽  
Prediction Models ◽  
Tall Buildings ◽  
Building Design ◽  
Parameter Distribution ◽  
Experimental Conditions ◽  
Global Emission ◽  
Wood Construction ◽  
Parameter Values

AbstractRising global emission have led to a renewed popularity of timber in building design, including timber-concrete tall buildings up to 18 stories. In spite of this surge in wood construction, there remains a gap in understanding of long-term structural behavior, particularly wood creep. Unlike concrete, code prescriptions for wood design are lacking in robust estimates for structural shortening. Models for wood creep have become increasingly necessary due to the potential for unforeseen shortening, especially with respect to differential shortening. These effects can have serious impacts as timber building heights continue to grow. This study lays the groundwork for wood compliance prediction models for use in timber design. A thorough review of wood creep studies was conducted and viable experimental results were compiled into a database. Studies were chosen based on correlation of experimental conditions with a realistic building environment. An unbiased parameter identification method, originally applied to concrete prediction models, was used to fit multiple compliance functions to each data curve. Based on individual curve fittings, statistical analysis was performed to determine the best fit function and average parameter values for the collective database. A power law trend in wood creep, with lognormal parameter distribution, was confirmed by the results.

Expansive behavior of coal mine spoils treated with calcium-based stabilizers

2014 ◽  
Vol 175 ◽  
pp. 46-57 ◽  
Author(s):  
Sochan Jung ◽  
Marika Santagata
Keyword(s):  
Coal Mine ◽  
Mine Spoils

Methods for assessing mine site rehabilitation design for erosion impact

Soil Research ◽  
2000 ◽  
Vol 38 (2) ◽  
pp. 231 ◽  
Author(s):  
Kenneth G. Evans
Keyword(s):  
Water Quality ◽  
Prediction Models ◽  
Sediment Delivery ◽  
Mine Site ◽  
3 Dimensional ◽  
Evolution Simulation ◽  
Erosion Prediction ◽  
Simulation Techniques ◽  
Subsequent Degradation ◽  
Site Rehabilitation

Erosion of rehabilitated mines may result in landform instability, which in turn may result in exposure of encapsulated contaminants, elevated sediment delivery at catchment outlets, and subsequent degradation of downstream water quality. Rehabilitation design can be assessed using erosion and hydrology models calibrated to mine site conditions. Incision rates in containment structures can be quantified using 3-dimensional landform evolution simulation techniques. Sediment delivery at catchment outlets for various landform amelioration techniques can be predicted using process-based and empirical erosion-prediction models and sediment delivery ratios. The predicted sediment delivery can be used to estimate an average annual stream sediment load that can, in turn, be used to assess water quality impacts. Application of these techniques is demonstrated through a case study applied to a proposed rehabilitation design option for the Energy Resources of Australia Ltd (ERA) Ranger Mine in the Northern Territory of Australia.

Effects of initial fertilizer treatment on the 10-year growth of mixed woodland on compacted surface-coal-mine spoils, S. Wales

2018 ◽  
Vol 29 (10) ◽  
pp. 3456-3468 ◽  
Author(s):  
Martin John Haigh ◽  
Heather Reed ◽  
Margaret D'Aucourt ◽  
Alison Flege ◽  
Mike Cullis ◽  
...  
Keyword(s):  
Coal Mine ◽  
Fertilizer Treatment ◽  
Mine Spoils ◽  
Surface Coal Mine

scholarly journals Effect of Oxytetracycline and Chlortetracycline on Bacterial Community Growth in Agricultural Soils

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1011 ◽  
Author(s):  
Vanesa Santás-Miguel ◽  
Manuel Arias-Estévez ◽  
Montserrat Díaz-Raviña ◽  
María José Fernández-Sanjurjo ◽  
Esperanza Álvarez-Rodríguez ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Bacterial Community ◽  
Total Organic Carbon ◽  
Agricultural Soils ◽  
Exchange Capacity ◽  
Soil Parameters ◽  
Leucine Incorporation ◽  
Negative Effects ◽  
Input Variables ◽  
Community Growth

Toxicity on soil bacterial community growth caused by the antibiotics oxytetracycline (OTC) and chlortetracycline (CTC) was studied in 22 agricultural soils after 1, 8 and 42 incubation days. The leucine incorporation method was used with this aim, estimating the concentration of each antibiotic which caused an inhibition of 50% in bacterial community growth (log IC50). For OTC, the mean log IC50 was 2.70, 2.81, 2.84 for each of the three incubation times, while the values were 2.05, 2.22 and 2.47 for CTC, meaning that the magnitude of OTC toxicity was similar over time, whereas it decreased significantly for CTC with incubation time. In addition, results showed that the toxicity on bacterial community growth due to CTC is significantly higher than when due to OTC. Moreover, the toxicity on bacterial community growth due to both antibiotics is dependent on soil properties. Specifically, an increase in soil pH and silt content resulted in higher toxicity of both antibiotics, while increases in total organic carbon and clay contents caused decreases in OTC and CTC toxicities. The results also show that OTC toxicity can be well predicted by means of specific equations, using the values of pH measured in KCl and those of effective cation exchange capacity as input variables. CTC toxicity may be predicted (but with low precision) using pH measured in KCl and total organic carbon. These equations may help to predict the negative effects caused by OTC and CTC on soil bacteria using easily measurable soil parameters.

EFFECT OF LEONARDITE ON DIFFUSION OF PHOSPHORUS IN COAL MINE SPOILS

Soil Science ◽  
1977 ◽  
Vol 124 (5) ◽  
pp. 285-290 ◽  
Author(s):  
J. W. HARRELL ◽  
M. SAEED
Keyword(s):  
Coal Mine ◽  
Mine Spoils

scholarly journals Modelling Current and Future Potential Habitats for Plantations of Eucalyptus grandis Hill ex Maiden and E. dunnii Maiden in Uruguay

Forests ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 948 ◽  
Author(s):  
Fernando Resquin ◽  
Joaquín Duque-Lazo ◽  
Cristina Acosta-Muñoz ◽  
Cecilia Rachid-Casnati ◽  
Leonidas Carrasco-Letelier ◽  
...  
Keyword(s):  
Climate Change ◽  
Prediction Models ◽  
Eucalyptus Grandis ◽  
Soil Parameters ◽  
Climate Change Scenarios ◽  
High Susceptibility ◽  
Productive Potential ◽  
Potential Habitats ◽  
Future Potential ◽  
South Of Brazil

Eucalyptus grandis and E. dunnii have high productive potential in the South of Brazil, Uruguay, and central Argentina. This is based on the similarity of the climate and soil of these areas, which form an eco-region called Campos. However, previous results show that these species have differences in their distribution caused by the prioritization of Uruguayan soils for forestry, explained by the particular conditions of each site. In this study, the site variables (climate, soil, and topography) that better explain the distribution of both species were identified, and prediction models of current and future distribution were adjusted for different climate change scenarios (years 2050 and 2070). The distribution of E. grandis was associated with soil parameters, whereas for E. dunnii a greater effect of the climatic variables was observed. The ensemble biomod2 model was the most precise with regard to predicting the habitat for both species with respect to the simple models evaluated. For E. dunnii, the average values of the AUC, Kappa, and TSS index were 0.98, 0.88, and 0.77, respectively. For E. grandis, their values were 0.97, 0.86, and 0.80, respectively. In the projections of climatic change, the distribution of E. grandis occurrence remains practically unchanged, even in the scenarios of temperature increase. However, current distribution of E. dunnii shows high susceptibility in a scenario of increased temperature, to the point that most of the area currently planted may be at risk. Our results might be useful to political government and foresters for decision making in terms of future planted areas.

scholarly journals Assessment of Soil Fertility and Crop Nutrient Status in Agricultural Soils Near a Brick Kiln Cluster

2020 ◽  
Vol 13 (1) ◽  
pp. 122
Author(s):  
Nasrin Chowdhury ◽  
Md. Mamunur Rasid
Keyword(s):  
Heavy Metal ◽  
Nutritional Status ◽  
Agricultural Soils ◽  
Risk Index ◽  
Contamination Factor ◽  
Nutrition Status ◽  
Soil Parameters ◽  
Optimum Level ◽  
Brick Kiln ◽  
The Impact

Brick kiln exhaust when deposited can hamper the nutritional status of the agricultural soils and crops. To study the impact, soil and associated plant samples were collected from the vicinity of a brick kiln cluster in Chattogram, Bangladesh. The soil contamination was evaluated by heavy metal indices. Agricultural soils close to the brick kiln area were very strongly acid to slightly acid. Organic carbon, total nitrogen and available phosphorus content of the agriculture soils near brick kiln cluster were 0.35% to 1.01%, 0.10 to 0.24% and 2.21 to 13.48 mg kg-1 respectively and the significant different mean value of 0.70%, 0.22% and 14.65 mg kg-1 respectively in the reference soil. The nutritional status of sampling sites was lower than the previously reported data. The nutrition status of the plants was at an optimum level as regular fertilizer application was practiced but showed an irregular pattern along with all the soil parameters and heavy metal indices. The contamination factor (Cd), potential ecological risk index (PER) and geo-accumulation index (Igeo) demonstrated that the agricultural soils in the vicinity of the brick kiln cluster were moderately- to highly-polluted. This indicates the deterioration of soil quality by uncontrolled brick kiln operation.

Sign in / Sign up

Export Citation Format

Share Document