Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 63 for “"boulders"”.
-
Weathering Regimes and Pedogenic Variability on Large Boulders, Karkevagge, Northern Scandinavia
The following conclusions were established from field, laboratory, and statistical analyses: (1) Clay content was marginally greater in soils developed on garnet-mica-schist than mica-schist; (2) Silt and clay content did not reflect eolian sediment input; (3) Soils that have formed on boulder tops …
-
Valuing an ecotourism resource : a case study of the Boulders Beach African penguin colony
The colony of African Penguins at Boulders, Simon's Town on the southern Cape Peninsula, Western Cape formed in 1985, and is now a major ecotourism destination. The African Penguin is listed as Endangered due in part to competition with commercial fisheries. Improvements in the spatial management …
-
Species richness and metacommunity dynamics in bryophytes
… habitats across twenty sites in Malta. These boulders acted as standard units for studying the effect of environmental, microtopographical and spatial factors on bryophyte metacommunities. The results indicated that bryophyte species richness on boulders was not significantly affected by …
-
Terrestrial cosmogenic nuclide dating applied in glacial stratigraphy and transportation studies on a greenfield exploration project in Kaarestunturi, Finnish Lapland
… prospect, where gold bearing quartz vein boulders have been discovered. The local glacial transportation history is studied in order to deduct the likely origin of the boulders. The local portion of the study involves rock and soil sample assays, glacial sedimentological studies, trenching …
-
The use of 10Be surface exposure dating of erratic boulders in the reconstruction of the late Pleistocene glaciation history of mountainous regions, with examples from Nepal and Central Asia
Be-10 surface exposure dating (SED) of erratic boulders is an innovative approach in Quaternary geochronology. It proves to be an excellent tool for the reconstruction of the glacial history of mountainous regions, which is an important part of climate change research. In the course of this work, I …
-
Seasonal habitat use and survival of brown trout (Salmo trutta) in Oatka Creek, Monroe County, New York
… debris was the most favored cover type; however, boulders were also important, especially during low streamflow, as they provide cover in deeper midstream channels. Large trout (300+ mm TL) showed a strong preference for slow, deep pools with high densities of woody debris and large boulders, …
-
Hydraulic and fluvial geomorphological models for a bedrock channel reach of the Twenty Mile Creek /
… analysis that focused upon large particles (boulders) and the forces needed to mobilize them. Several existing boulders were examined by collecting detailed measurements to derive three-dimensional physical models for the application of fluid and solid mechanics to predict movement in the …
-
Investigating the Effects of Lithology on Landscape Evolution Processes across Scales
… First, I assess the geomorphic function of boulders found on hillslopes and channels in the Valley and Ridge province of the Appalachians, which are sourced from resistant lithologies capping ridgelines. High-resolution UAV surveys and field mapping of boulder distributions and …
-
Cenozoic Evolution of the Gold Creek Basin, Western Montana: Mapping and Documenting the Geology of the Rock Creek Lake 7.5' USGS Quadrangle
… consist of relatively unweathered granitic boulders. Deposits interpreted as reflecting the Bull Lake Glaciation are characterized by wide, round-crested moraines (mean crest width of 50-100m) and low distal slope angles (average 10-20°), with little exposure of quartzite and weathered …
-
Cenozoic Evolution of the Gold Creek Basin, Western Montana: Mapping and Documenting the Geology of the Rock Creek Lake 7.5' USGS Quadrangle
… consist of relatively unweathered granitic boulders. Deposits interpreted as reflecting the Bull Lake Glaciation are characterized by wide, round-crested moraines (mean crest width of 50-100m) and low distal slope angles (average 10-20°), with little exposure of quartzite and weathered …
-
Channel Morphology and Riparian Vegetation Influences on Fluvial Aquatic Habitat
… percent of the channel dominated by protruding boulders. The structural complexity of areas with protruding boulders create complex flow patterns suggesting that flow complexity plays an important role in available brook trout habitat preferences at the local scale, although the 2D depth …
-
Human recreational activity and its impact on a metropolitan coastline
… areas differs to those of unprotected areas. If boulders on a sheltered shore are over-turned during bait gathering it has an adverse effect on the boulder communities, whether the boulders are replaced or left over-turned. When bait gatherers target on mussel-worms as bait, they may cause …
-
Evaluating Ecological Influences of Altered Flow Regimes Using Two- and Three-Dimensional Hydrodynamic Models
… flow patterns near river obstructions such as boulders and large woody debris provide unique habitat for many aquatic organisms. Numerical modeling of the flow structures surrounding these obstructions is challenging, yet it represents an important tool for aquatic habitat assessment. Moreover, …
-
Reproducing and Quantifying Spatial Flow Patterns of Ecological Importance with Two-Dimensional Hydraulic Models
… presence of topographic features (e.g. exposed boulders, bars). How flow complexity influences a stream's ecological health and morphological stability, as well as how flow complexity responds to changes in hydrologic conditions, is poorly understood. One-dimensional (1-D) hydraulic models and …
-
Surface boulder concentrations of the Late Wisconsinan Rainy lobe, Minnesota, USA
… these locations noted the occurrence of surface boulders but dismissed them as an erosional lag or resulting from periglacial processes. Characterizations of boulder lithologies, the composition and texture of the underlying till, and mean transport length suggest that this is not the case, and …
-
Sedimentologic and Stratigraphic Significance of Boulder Layers in the Outer Coastal Plain of Southeastern Virginia
… the capacity to entrain the larger cobbles and boulders in the boulder layers. Winter river-ice rafting might provide a possible means of transporting the larger and angular clasts from the Blue Ridge and Piedmont Provinces to the boulder layers in southeastern Virginia. Reproduced</p>
-
Small mammal communities on a reclaimed mountaintop mine/valley fill landscape in southern West Virginia
… channels, a habitat use not found in literature. Boulders in channels form interstitial networks that may simulate rock outcrops, their typical habitat.
Page 1 of 4