Basal-topographic control of stationary ponds on a continuously moving landslide
Aerial photography ; Colorado ; Global Positioning System ; Landslide ; Mountain ; Photogrammetry ; Photointerpretation ; Pond ; Topography ; United States of America
elevation of one pond on the Slumgullion landslide in the San Juan Mountains of southwestern Colorado. They also examine the persistence of surface morphology at the 8 pond locations using topographic profiles measured from stereo aerial photographs from
The AA. evaluate the implication that pond locations are controlled by basal slip surface topography using 9 years of systematic field observations of 8 ponds, and Global Positioning System (GPS) observations of the spatial position and water level
Beaver-pond sequence morphology and sedimentation in northwestern Montana
Two adjacent beaver-pond sequences of seven ponds each were examined along the eastern boundary of Glacier National Park, Montana, to determine spatial patterns and amounts of sedimentation, both within individual ponds and along pond sequences
. Dams and their associated ponds were categorized into two age groups, young versus old, based on dam morphology and surface vegetation.
Sedimentation rates and patterns in beaver ponds in a mountain environment
Biogeography ; Humid environment ; Montana ; Mountain ; Pond ; Sediment budget ; Slope ; Soil erosion ; United States of America ; Vegetation ; Water quality
The AA. examine the rates and volume of sedimentation occuring in recently constructed beaver ponds of known age in the northern Rocky Mountains of Glacier National Park, Montana, USA. They describe how these factors vary by pond-site type
, by position within a downstream chain of ponds, and by consideration of carbon dynamics. They compare their data to studies from the boreal forest of eastern and central North America.
Hydroclimatic analysis of a carbonate island pond through the development of a hydrologic landscape unit model
Bahamas ; Carbonate rock ; Climate ; Hydrology ; Impact ; Island ; Model ; Pond ; Water resources
The aim of this study is to develop a methodology that allows for an estimate of the hydroclimatic influence on an inland pond system on San Salvador, Bahamas. The methodology utilizes the Hydrologic Landscape Unit (HLU) model, a new conceptual
model. For this case study, a linear regression model was developed to empirically assess the HLU. This analysis separates tidal and climatic impacts on water levels of the pond and indicates that astronomical tides dominate, explaining 65
% of the variance in pond water-level observations.
Characteristics of beaver ponds on deltas in a mountain environment
This paper describes floodplain beaver ponds on low-gradient deltas in glacial finger lakes in Glacier National Park, Montana. These ponds are distinctly larger, probably fed by hyporheic flow, and stable and long-lived. Ponds examined were
, with one exception, 44 years old. Glacial discharge is present in each valley where beaver ponds occupy low-gradient deltas, and this discharge likely sustains pond water level over the course of the summer. As glaciers recede and disappear, deltaic beaver
ponds dependent on hyporheic flow may be negatively affected.
Mapovani vegetace rybniku s pouzitim fotointerpretacni metody. (Mapping of vegetation of ponds with use of photo-interpretation)
The littorals of ponds are often covered by dense vegetation not suitable for field mapping. The method of vertical photographical mapping is demonstrated on two ponds in Northern Bohemia. (MS).
Diurnal evaporation from fresh and hypersaline shallow ponds in a hot, dry environment
Arid area ; California ; Dead Sea ; Diurnal variation ; Energy balance ; Evaporation ; Heat flow ; Jordan ; Lake ; Pond ; Salinity ; United States of America
A numerical procedure is developed to evaluate the diurnal trend of evaporation from a shallow freshwater pond and a hypersaline pond, both of which are 2 m deep and encountering identical meteorological forcings. A rapidly convergent algorithm
This paper examines the hydrological connectivity and the storage status of a cluster of tundra ponds in a High Arctic polar oasis, relating seasonal hydrological changes to lateral drainage, pond water balance and active layer thaw conditions.
Clustered streamlined forms in Athabasca Valles, Mars : evidence for sediment deposition during floodwater ponding
A unique clustering of layered streamlined forms in Athabasca Valles is hypothesized to reflect a significant hydraulic event. The forms, interpreted as sedimentary, are attributed to extensive sediment deposition during ponding
and then streamlining of this sediment behind flow obstacles during ponded water outflow. These streamlined forms are analogous to those found in depositional basins and other loci of ponding in terrestrial catastrophic flood landscapes. Likewise, the streamlined forms
Temporal variability of sediment yield using accumulations in small ponds
Présentation d'une méthode d'évolution de la variabilité temporelle de l'accumulation des sédiments dans des petits lacs. Application au Gallie Pond, dans les Coast Mountains, British Columbia.
The Euglenophyta of a polluted lowland brook-pond system at Boom (Antwerp, Belgium) during an aeration experiment
A polluted lowland brook-pond system was locally treated by aeration using the EVENS-technique. Over a period of 3 years the water was analysed physico-chemically and the Euglenophyta population was studied. (LW).
The effect of ponding depth on infiltration in a crusted surface depression
This study investigates the influence of ponding depth on infiltration rate in a depression caped with a seal of varying thickness and porosity. Two ponding depths were selected : 0.5 cm (shallow) and 4.0 cm (deep), and two soils of distinctly
Variability of dry sediment bulk density between and within retention ponds and its impact on the calculation of sediment yields
The objectives of this study are to make an assessment of the variability in dry sediment bulk density (dbD) between and within small flood retention ponds in central Belgium and to look at the factors controlling this variability. It will further
be evaluated if the various existing dry sediment bulk density prediction techniques for large reservoirs can be used in another environment, i.e. small ponds, and what the implications of their use are for the calculation of sediment yield.
Natural iron precipitates in a mine retention pond near Jabiru, Northern Territory, Australia
The objectives of this paper are to: a) report on the detailed characteristics of the red-brown precipitates forming the sludge plumes in retention pond 4; b) describe and characterise the red-brown precipitate coating the organic mat over the pond
Morphology-dependent water budgets and nutrient fluxes in Arctic thaw ponds
Alaska ; Arctic Region ; Climatic warming ; Coastal plain ; Cold area ; Ecosystem ; Nutrient ; Patterned ground ; Permafrost ; Pond ; Thawing ; Water budget
Permafrost on the Arctic Coastal Plain of Alaska creates unique pond morphologies : deep troughs, shallow low-centred polygons (LCPs) and larger coalescent ponds. By monitoring seasonal trends in pond volume and chemistry, the AA. evaluated whether
pond morphology and size affect water temperature and desiccation, and nitrogen (N) and phosphorus (P) fluxes. Evaporation was the largest early-summer water flux in all pond types. LCPs dried quickly and displayed high early-summer nutrient
The AA. demonstrate the effect seasonal inter-dune freshwater ponds have on the bleaching of the color of sand dunes by iron reduction in the anaerobic conditions they create. By combining spectral measurements of field samples of dune sand together
The benthic insects of a polluted lowland brook-pond system (Antwerp, Belgium)
A total of 26.826 insect larvae and pupae were collected from 13 sampling areas in a polluted brook-pond system, locally treated by aeration. 106 species were collected: 1 Ephemeroptera, 4 Coleoptera and 101 Diptera. The Chironomidae dominated
by species richness and density of individuals/m. Two major insects communities were recognizable: the brook community was characterized by a high species richness of Brachycera and Nematocera, while the pond community consisted nearly exclusively
The ponds on the Seward Peninsula were examined to determine if recent changes in climate have impacted their development and degradation. These investigations included field studies through coring and thermal analyses, ground penetrating radar (GPR
Erodibility ; Erosion rate ; Grain size distribution ; Honshu ; Human impact ; Japan ; Pond ; Precipitation ; Sedimentation ; Soil erosion ; Soil properties ; Watershed
Five years of observations on sedimentation rates in two ponds located near transformed land areas in the Kobe district of central Japan have shown the relationship between sedimentation and development during land transformation. One of the ponds