Water-drop stability of PVA-treated natural soil aggregates from different land uses
A study was carried out to evaluate the interactive effects of land use and polyvinyl alcohol (PVA) concentration on the water-drop stability of natural soil aggregates collected from eroded, forest, agricultural and grass lands. The water-drop
stability of these aggregates was monitored using single raindrop simulator. The results show that the PVA application at the rate of 0.1% could increase the water-drop stability of soils under eroded land equivalent to that of the untreated grassland soils.
This paper presents an initial study testing the hypothesis that debris-flow volume and run-out lengths in the Ma Ha Tuak Range have declined substantially since the end of the last ice age. The AA. used a mix of field and geospatial methods
to estimate volume, and the varnish microlamination technique to estimate minimum ages of debris deposits. Estimates of debris-flow volumes show a drop of more than 2 orders of magnitude from latest Pleistocene to 20th century or Little Ice Age. In contrast
[b1] School of Geographical Sciences and Urban Planning, Arizona State Univ., Tempe, Etats-Unis
Effects of hydrophobicity on splash erosion of model soil particles by a single water drop impact
The effects of particle hydrophobicity on splash behaviour by a single water drop impact were examined here using high-speed videography. Water drops were dropped on beds of hydrophilic and hydrophobic glass beads, serving as model soil particles
. The resulting impact behaviour was measured in terms of the trajectories of particles ejected from the beds and their final resting positions. The response to the impacting water drop was significantly different between hydrophilic and hydrophobic particles
[b3] School of Science and Technology, Nottingham Trent Univ., Nottingham, Royaume-Uni
This region is one of the most severely affected regions of Hungary as far as the drop of free groundwater levels and the depletion of confined groudwater reserves are concerned. The research was carried out within the framework of the MEDALUS
Attractiveness of Poland as a tourist destination in the eyes of Czech students of primary schools
republic. The data are based on a questionnaire survey done in april 2009 as a result, the author managed to receive 242 questionnaires filled out by students of seventh to ninth grade of primary schools. Analysis of the questionnaires confirmed the thesis
This study summarizes the analysis of perception of Poland as a tourist destination in the eyes of students of primary schools located in Prague and was created as part of a larger survey of the attractiveness of Poland for the people of the czech
Drop testing aggregate stability of some soils near Merida, Spain
The drop test for aggregate stability results in a distribution of destroyed aggregates with increasing drop number. The influence of prewetting time on drop test results is considered. Secondly new indices to describe the drop test results
and modifications of the drop test are suggested to avoid undue influence of small numbers of very stable aggregates, and to shorten the test procedure.
Commuting patterns of secondary school students in the functional urban region of Budapest
patterns of the resulting commuting. An expansion of the definition of commuting to daily travel to school is suggested based on the fundamental similarities to commuting to work. The analysis is carried out on two levels combining municipality level
The objective of the study is to explore the potential imbalance between demand for secondary education and the supply of schools within the social activity space of education in the functional urban region of Budapest and analyse the regional
Simulation of the size distribution and erosivity of raindrops and throughfall drops
This paper presents a model that simulates the size distribution and erosivity of raindrops and throughfall drops. It utilizes existing models of rainfall drop size distribution and fall velocity and combines them with newly collated evidence
of throughfall drop size distributions. The model is sensitive to parameters that are easily measured or estimated : rainfall intensity, the mean volume drop diameter of the intercepted throughfall, canopy cover, and canopy height.
numerous water basins where the contamined sediments were washed out and the pollution load levels dropped, the Střela River Basin did not record significant changes in pollution level related to the flood. - (EN)
How the systems of local administrative units were formed in four different periods in Japan in Languages, paradigms and schools in geography.
Three aspects are pointed out from the formation of the systems of local administrative units in four periods of Japanese history. The period when the statute called ritsu-ryo was established, the period when medieval fiefs were established
This article explores the use of letters by the UK Border Agency to communicate decisions on asylum claims within a UK drop-in centre. It opens by offering a governmental reading of letters as things which define the limits of present and future
[b1] Geography, School of Environment, Education and Development, Univ., Manchester, Royaume-Uni
at the uses and role of maps in school would seem to be required. The work reported here arose out of results of questionnaires supplied to the geography teachers at all the junior-high schools in the Polish city of Wrocław. – (BJ)
. In addition, an attempt has been made to determine the identity of the maps junior-high school teachers regard as absent from atlases, as well as to assess whether the maps made use of currently prove suitable. From the teachers’ point of view, a new look
The process of economic and social transformation in Poland in the 1990s ushered in changes to rural parts of Lower Silesia. These are visible in a decline in the educational and healthcare infrastructure. As a result of the reforms carried out
, the number of schools, grammar-schools, surgeries and health centres decreased. Consequently, people living in rural areas have worse access to health services and must drive their children to school. only the number of chemist's shops has shown an increase
Measurement of simulated drop size distribution with an optical spectro pluviometer : sample size considerations
This study investigates the potential of an optical spectro pluviometer (OSP) to measure drop size distributions. Particular attention is paid to the impact of drop sample size and derived erosivity parameters. An experimental set-up using
a rainfall simulator and an OSP is described. Results on drop size distributions and sampling effects are discussed.