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Simulation of Relationship between River Discharge and Sediment Yield in the Semi-arid River Watersheds

Khaleghi M. R., Varvani J.

Acta Geophysica

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2018

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Vol. 66, no. 1

109--119

EN

Complex and variable nature of the river sediment yield caused many problems in estimating the long-term sediment yield and problems input into the reservoirs. Sediment Rating Curves (SRCs) are generally used to estimate the suspended sediment load of the rivers and drainage watersheds. Since the regression equations of the SRCs are obtained by logarithmic retransformation and have a little independent variable in this equation, they also overestimate or underestimate the true sediment load of the rivers. To evaluate the bias correction factors in Kalshor and Kashafroud watersheds, seven hydrometric stations of this region with suitable upstream watershed and spatial distribution were selected. Investigation of the accuracy index (ratio of estimated sediment yield to observed sediment yield) and the precision index of different bias correction factors of FAO, Quasi-Maximum Likelihood Estimator (QMLE), Smearing, and Minimum-Variance Unbiased Estimator (MVUE) with LSD test showed that FAO coefficient increases the estimated error in all of the stations. Application of MVUE in linear and mean load rating curves has not statistically meaningful effects. QMLE and smearing factors increased the estimated error in mean load rating curve, but that does not have any effect on linear rating curve estimation.

2

The stress state analysis of rescue seat area of submarine Kobben class during rescue vehicle landing

Szturomski B., Bohn M.

Journal of Polish CIMAC

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2014

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Vol. 9, no 3

91--99

EN

Lists the documents that contain guidelines for the preparation of the design model using Finite Elements Methods (FEM) [5], reflect the geometry of the object and its discretization, a description of the material, boundary conditions and loads. Posted examples of the results of the stress state in the design of the seat area of submarine Kobben class rescue obtained from simulation FEM for deep 250m. This article includes calculating stamina of seat area construction (stress states) during rescue vehicle type SRC or DSRV docking taking into account the depth of immersion and sea current in CAE program, which are the basis for determining the maximum safe depth for use the emergency system.

3

Floristic and community diversity of weed vegetation in willow short-rotation coppices in different soil-habitat conditions

Wróbel M., Wróbel J., Gregorczyk A.

Polish Journal of Ecology

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2011

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Vol. 59, nr 2

289-296

EN

Plantations of energy plants are the alternative form of post-agricultural and degraded land management. Particularly, small-area plantations of the tree species, including the willow Salix sp., raise local natural values of degraded habitats and are a dwelling place for numerous entomofauna, birds and mammals. Herbaceous vegetation accompanying short-rotation coppice (SRC) constitutes at the beginning a competition for energy species plantings and therefore is subject to chemical and mechanical control. In successive years, it may increase local biodiversity at the level of plant species and associations, both in ruderal habitats and extensively used agricultural lands. In the presented paper, results of the study referring to evaluation of the floristic and phytosociological diversity of herbaceous vegetation accompanying selected 4-5-year-old willow short-rotation coppices (SRC) situated on lands adjacent to the Odra River estuary (Western Pomerania) in different soil-habitat conditions are showed. Investigations were carried out in willow SRCs located on degraded sandy silts and sewage sludge-fertilised silts, fallow post-farmland and degraded grassland. The largest number of species confirmed by the highest Shannon-Wiener.s diversity index (H) and species evenness index (J) was characteristic of SRCs set on sandy silt fertilised with sewage sludge, wet grassland and fallow post-farmland when compared to those on sandy silt and over-dried grassland. The analysis of vegetation showed a strong predominance of anthropogenic associations (synanthropic and seminatural) over autogenic (natural) ones.

4

Internetowy kurs GMDSS

Uriasz J., Wołejsza P.

Zeszyty Naukowe / Akademia Morska w Szczecinie

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2008

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nr 13 (85)

99-103

PL

Artykuł przedstawia założenia internetowego kursu dla operatora łączności GMDSS. Kurs jest opracowywany przez grupę ekspertów z dziesięciu krajów europejskich. W tej grupie znaleźli się również specjaliści z Akademii Morskiej w Szczecinie. Prace są realizowane w ramach projektu finansowanego przez Unię Europejską z programu Leonardo da Vinci.

EN

The article presents the guidelines of an internet based GMDSS course. It has been prepared by a group of experts from ten European countries, among others lecturers from the Maritime Academy of Szczecin. The project EGMDSS has been worked out within the framework of European Union Leonardo da Vinci Programme.