scholarly journals Bottom Sediments from a Dam Reservoir as a Core in Embankments—Filtration and Stability: A Case Study

2021 ◽  
Vol 13 (3) ◽  
pp. 1221
Author(s):  
Karolina Koś ◽  
Andrzej Gruchot ◽  
Eugeniusz Zawisza
Keyword(s):  
Bottom Sediments ◽  
Cohesive Soil ◽  
Organic Content ◽  
Natural Soil ◽  
Earthen Structures ◽  
Dam Reservoirs ◽  
Earth Structures ◽  
Economic Use ◽  
Sealing Elements

A possibility of using bottom sediments from dam reservoirs in earth structures was considered. Sediments from the Rzeszow reservoir (Poland) were used as research material, which, according to geotechnical standards, were classified as low permeable silt with high organic content. As fine, cohesive soil with a low coefficient of permeability, the sediments can be used in sealing elements of hydraulic engineering embankments. In order to verify the suitability of the sediments, stability and filtration calculations were carried out for embankments with a sealing in the form of a core made of the sediments. It was stated that by using a core made of sediments, the volume of seepage on the downstream side during continuous or variable backwater was significantly lower in relation to an embankment without a core, and the phreatic line did not extend to the downstream slope. It is estimated that, in the case of a planned dredging in Rzeszow Reservoir, the amount of dredged sediment would exceed 1.5 million m3, and therefore, the possibility of their economic use is essential. The search for materials that could replace natural soil in earthen structures is an important issue from both the ecological and economic points of view.

scholarly journals Suspended shellfish culture impacts on the benthic layer: a case study in Brazilian subtropical waters

2012 ◽  
Vol 60 (2) ◽  
pp. 219-232 ◽  
Author(s):  
Natália de Moraes Rudorff ◽  
Carla Van Der Haagen Custodio Bonetti ◽  
Jarbas Bonetti Filho
Keyword(s):  
Total Population ◽  
Organic Content ◽  
Multivariate Techniques ◽  
Data Sets ◽  
Productive Activity ◽  
Local Conditions ◽  
Benthic Environment ◽  
Shellfish Culture ◽  
Population Ratio

This study aimed to assess benthic impacts of suspended shellfish cultures in two marine farms located in South Bay, Florianópolis (SC, Brazil). The goal was to detect changes in the benthic layer and evaluate the influence of local conditions, such as hydrodynamics and geomorphology, on the degree of impact at each site. The method included analysis of three groups of oceanographic descriptors: hydrodynamic; morpho-sedimentological (bathymetry, grain size and organic content), and ecological (foraminiferal fauna). Data sets were analyzed using geostatistical and multivariate techniques. Ecological descriptors seemed to be more effective under different environmental conditions than sedimentological variables. Those that best identified culture-related biodeposits, were: dominance of Ammonia tepida; test size; and living: total population ratio. Only slight differences were observed within and outside the culture structures. However, a greater alteration was observed at the site with weaker hydrodynamics and located in shallower depths. The conclusion is that biodeposition at studied still causes little alteration in the local benthic environment. However, local factors such as hydrodynamics and geomorphology were shown to be important in minimizing these impacts. These are criteria that should be considered in site selection programs for the development of this productive activity.

scholarly journals KOMPETENSI PETERNAK SAPI POTONG PERANAKAN ONGOLE DALAM PEMBUATAN KOMPOS (STUDI KASUS PADA KELOMPOK TERNAK MEKAR KECAMATAN DAGANGAN KABUPATEN MADIUN)

2018 ◽  
Vol 10 (3) ◽  
pp. 1
Author(s):  
Deha Purwoko ◽  
Bekti Nur Utami
Keyword(s):  
Manufacturing Process ◽  
Research Method ◽  
Organic Content ◽  
Compost Quality ◽  
Preparation Stage ◽  
Before And After ◽  
Descriptive Approach ◽  
Quantitative Descriptive ◽  
Selection Of

This research aims to describe the level of competence of farmers in composting, and to draft extension and try out the implementation of counseling about composting in group of livestock of Mekar. The research was conducted in sub-district Dagangan of Madiun Regency. Selection of livestock group is done by purposive that is the only group of livestock that have made compost that is group of livestock of Mekar which is located in Kepet village. The research method used is case study with quantitative descriptive approach with scoring. The population is 44 people, the sample is based on the census. The results showed that: 1) the level of competence of farmers in composting is classified with the details of the competence of the preparation stage is low, the competence of the manufacturing process is low, and the competence of the storage stage is classified; and 2) drafting the extension plan based on the target and the purpose of extension so that the breeder know, understand and able to increase the C-Organic content and C / N Ratio on the compost according to the standard. Success shows the improvement of compost quality before and after counseling in accordance with the purpose of counseling.   Keywords: competence of breeder, livestock group of Mekar, draft extension, composting, extension

Analysis of Shear Characteristics of Cohesive Soil and Rigid Base: A Case Study of Concrete Base

2020 ◽  
Vol 39 (1) ◽  
pp. 135-143
Author(s):  
Dafang Yang ◽  
Shuangjian Niu ◽  
Yanyan Cai ◽  
Wenlin Feng ◽  
Dingyuan Zhang
Keyword(s):  
Cohesive Soil ◽  
Rigid Base ◽  
Concrete Base ◽  
Shear Characteristics

Microplastics and earthworms in soils: A case study on translocation, toxicity and fate

2020 ◽  
Author(s):  
Nils Dietrich ◽  
Daniel Wilkinson ◽  
Florian Hirsch ◽  
Magdalena Sut-Lohmann ◽  
Antonia Geschke ◽  
...  
Keyword(s):  
Organic Waste ◽  
Soil Column ◽  
Column Experiment ◽  
Lumbricus Terrestris ◽  
Natural Soil ◽  
Arable Soils ◽  
Different Types ◽  
Soil Column Experiment ◽  
Illegal Waste

<p>Microplastics are not only found in marine and lacustrine environments but also in soils. Microplastics enter natural soil environments from legal or illegal waste deposition. In arable soils, microplastics often stem from the decomposition of plastic sheeting. The accumulation of (micro-)plastic from garbage bags in which biological waste is often disposed, is also a significant problem for the recycling and composting of organic waste. Commercially available compostable bags are advertised as degradable. Thus, these compostable bags ought to accumulate less in soils than non-compostable bags. We present a pilot study to determine the preference of earthworms (Lumbricus terrestris and Eisenia hortensis) for taking up and translocating different types of microplastic in soils. Our initial findings from the soil column experiment suggest that the earthworms show a strong tendency for the uptake of microplastic.  We also observed direct and indirect transport of microplastic by earthworms from the surface to deeper parts of the soil columns.</p>

Minimization of organic content in simulated industrial wastewater by Fenton type processes: A case study

2009 ◽  
Vol 170 (2-3) ◽  
pp. 954-961 ◽  
Author(s):  
Ivana Grčić ◽  
Dinko Vujević ◽  
Josip Šepčić ◽  
Natalija Koprivanac
Keyword(s):  
Industrial Wastewater ◽  
Organic Content
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