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Showing papers on "Groyne published in 1998"


DOI
01 Jan 1998
TL;DR: In this paper, the authors investigated 42 accidently chosen groynes (between Aken and Lauenburg) and found that the richness in species is relatively high: 150 species which means nearly 60% of the total riverbank flora.
Abstract: By improving the inland waterway systems thousands of groynes were built up on the banks of large rivers, the vegetation of which is nearly undiscovered. At the Elbe 42 accidently chosen groynes were investigated (between Aken and Lauenburg). The richness in species is relatively high: 150 species which means nearly 60 of the total riverbank flora. The number of high frequent species is remarcable for a pioneer habitat. The differences within the species combination along the river were investigated as well as the vegetation of the groynes. Numerous groynes were taken as permanent plots for longtime monitoring. The species tumover of one groyne from 1994 to 1996 is discussed

4 citations


13 Mar 1998
TL;DR: In this article, the authors provide geomorphological guidance over the introduction of "habitat enhancement" features for fisheries improvement which is an expanding area of interest throughout the region.
Abstract: This report seeks to briefly provide geomorphological guidance over the introduction of 'habitat enhancement' features for fisheries improvement which is an expanding area of interest throughout the region. This document is a primary attempt to draw together the salient details from the large quantity of literature published in recent years with reference to boulder introduction and to groyne/deflector placement in NW rivers. Secondly the potential introduction of such features is assessed, with reference to the proposed works at Carhead on the Eden.

1 citations


Patent
28 Jul 1998
TL;DR: In this paper, the authors proposed to prevent a groyne from collapsing by constituting the structure of a flat-plate-like bottom plate and one or a plurality of wall bodies standingly provided from the bottom plate.
Abstract: PROBLEM TO BE SOLVED: To prevent a structure such as groyne from collapsing by constituting the structure of a flat-plate-like bottom plate and one or a plurality of wall bodies standingly provided from the bottom plate. SOLUTION: In this buried block 10 for a river structure, the shape and the quantity are determined according to conditions such as the scale of the structure, topography, or water flow, the size is designed so as to be buried in the structure, and it is manufactured in a manufacturing yard. Next the foundation is constructed on the ground of the installation position, and the block 10 is installed on the structure construction position so that the wall face of the wall body coincides with the designed angle in the direction traversing the water flow. When the structure such as groyne 1 is laid in the oblique direction relative to the flow of a river, it had better to use a block having auxiliary standing wall bodies, and hence movement in the lateral direction of rocks and the like can be effectively prevented. Rocks and the like are heaped on the bottom plate of the block 10 and on the adjoining zone, the block 10 is buried in the rocks and the like, and the structure of required sectional form is constructed. Hereby, movement of rocks and the like due to river flow at a flood is restrained, and the structure can be prevented from collapsing.

1 citations