Assessing volumetric strains and mass balance relationships resulting from biotite-controlled weathering: Implications for the isovolumetric weathering of the Boulder Creek Granodiorite, Boulder County, Colorado, USA
The AA. present results from a study of two sites located on the 1.65 Ga Boulder Creek Granodiorite near Boulder, Colorado, USA, in which weakly chemically altered saprock derived from tonalitic and granodioritic–tonalitic bedrock records volumetric
Boulders of 2 coastal areas (Cape Skalas in southern Lakonia, Peloponnese; Cape Gerogombos on Paliki Peninsula in western Greece were surveyed within their topographical context using a laser scanner in combination with a DGPS. 3D reconstruction
allows the determination of highly accurate volumetric data, as well as the extraction of further parameters, such as elevation above sea level, inclination and distance to the sea for each boulder. The results show that terrestrial laser scanning
the common method in scientific studies on boulder dislocation. The AA. found that volume data based on axes measurements together with density approximations result in a considerable overestimation of the mass of dislocated boulders.
Three-dimensional modeling of coastal boulders using multi-view image measurements
Boulder ; Coastal environment ; Coastal geomorphology ; Digital photography ; Geomorphometry ; Island ; Model ; Taiwan
This paper concentrates on creating precise, measurable and textured three-dimensional (3D) models of coastal boulders without physical contact with the object, based on multi-view image measurement techniques. The AA. propose the use of low-cost
overlapping multi-view digital photographs, allow the reconstruction of realistic-looking and textured boulder surfaces. A particular interest in this task is the family of algorithms known as structure from motion (SFM). The work presents analysis of SFM
techniques by examining 3D models of boulders observed at a coastal field site on Lu Dao Island in south-eastern Taiwan.
This study proposes a new systematic procedure for the dendrochronologic dating of the movement (esp. lateral spreading, backward rotation and toppling) of large boulders with precision to seasons. Themethodology is based on the dendrogeomorphic
The growth and decay of tree roots can stir and transport soil. Therefore, the AA. document the mounding of soil beside Ponderosa and Lodgepole pine trees in the forests of Colorado's Boulder Creek watershed. Positive mounding occurs on all sides
2014
[b1] Inst. of Arctic and Alpine Research (INSTAAR), Univ. of Colorado, Boulder, Etats-Unis
[b2] Dep. of Geological Sciences, Univ. Colorado, Boulder, Etats-Unis
Boulder ; Coastal dynamics ; Coastal environment ; Historical period ; Malta ; Mediterranean Sea ; Model ; Remote sensing ; Satellite imagery ; Sea level ; Tsunami ; Wave
. Existing models of runup and boulder detachment imply that the extreme wave signatures lie beyond the capabilities of storm waves. These considerations, taken together with the range of evidence available, point toward tsunami as the agency responsible
, which is consistent with the evidence from Mediterranean marginal coasts opposed to the Maltese Islands. Evidence from existing boulder detachment, tsunami runup and wave velocity models suggests that tsunami with shoreline wave height of up to ~4 m
R-value variability was identified and sources of significant errors were attributed to variations in boulder surface texture and the incorporation of weathered boulders into moraines through push mechanisms and paraglacial reworking.