The gravel-sand transition in a disturbed catchment
Australia ; Carrying capacity ; Grain size distribution ; Gravel ; Human impact ; Sand ; Sediment load ; Stream ; Tasmania ; Watershed
More than 40 million cubic metres of mining waste were supplied to the Ringarooma River, northeast Tasmania, between 1875 and 1984, leading to successive phases of aggradation and degradation. The development of the gravel-sand transition during
Sediment from hydraulic mining detained by Englebright and small dams in the Yuba basin
Aquatic ecosystem ; California ; Dam ; Environmental management ; Fish breeding ; Gold ; Mining activity ; Sierra Nevada ; United States of America ; Water quality ; Watershed
of the texture and lithology of modern bed materials in the Yuba River basin are presented that demonstrate reworked sediment from mining is an important component of the modern sediment load and fine spawning gravels.
First, historical geomorphic changes in the watershed are outlined that influence the physical context of the feasibility study. The Yuba watershed is centered in the hydraulic gold-mining region. Second, recent findings of high concentrations
of mercury in sediment and fish tissues in the watershed are briefly reviewed. Third, historic data on 20th century hydraulic mining are presented that document numerous small dams built in the Yuba basin to detain mining sediment. Finally, field measurements
A one-dimensional model for simulating armouring and erosion on hillslopes : 2. Long term erosion and armouring predictions for two contrasting mine spoils
This paper investigates the dynamics of soil armouring as a result of fluvial erosion for a non-cohesive sandy gravel spoil from the Ranger Mine, Australia, and a cohesive silt loam spoil from the Northpakes Mine, Australia, using a model
Tailings fans and valley-spur cutoffs created by hydraulic mining
Alluvial cone ; Base level ; California ; Channel geometry ; Human impact ; Longitudinal section ; Meander ; Mining activity ; Sediment budget ; Stream ; United States of America
Sand and gravel tailings from nineteenth century open-pit hydraulic gold mines formed large alluvial fans at tributary confluences in the northwestern Sierra Nevada, California. In the Bear River watershed, several of these fans were so large
Medium-term fluvial island evolution in a disturbed gravel-bed river (Piave River, Northeastern Italian Alps)
Aerial photography ; Alps (The) ; Flood ; Fluvial dynamics ; Fluvial island ; Gravel ; Human impact ; Italy ; LiDAR ; River bed ; Stream ; Vegetation ; Veneto
there was a moderate increase in island numbers and extension, followed by a further increase from 1991, due to a succession of flood events in 1993 and 2002, as well as a change in the human management relating to the control of gravel-mining activities. The narrowing
of the gravel-bed Piave River. The results suggest that established islands lie at a higher elevation than building and pioneer islands, and have a thicker layer of fine sediments deposited on their surface after big floods. After the exceptional flood in 1966
becomes sandy. Bed erosion is high in areas with shallow Tertiary sand or mining-induced subsidence. Transfer rate of sand and gravel to the Rhine delta did not change despite human impact.
The aim of this study was to quantify the downstream fluxes of clay, silt, sand, gravel and cobbles through the Rhine between 1991 and 2010 and to identify the sources and sinks of these sediments. This was done by analysing a unique dataset
containing thousands of sediment transport measurements and by evaluating the sediment budget. It is highlighted that 68% of gravel and sand flux is caused by anthropogenic bed erosion and gravel supply. Sediment fluxes change abruptly where the river bed
Analysis of percussion drillings and a long excavated section provide new information on the Late Quaternary to Late Holocene floodplain evolution from the most important Central European iron-mining region of the 15th century. The generalized
sequence of the Vils River floodplain is built of 5 units representing facies of different genesis (rock/saprolite, gravel, sand, loam, peat) that are identified by physical, chemical, and mineralogical parameters (grain size, clast shape, and content, TOC
of mining at the Vils River and hence suggest a causal connection with mining activities in the catchment (both on the slopes and in the floodplain) with intense deposition of flood loams.
of the streambed. The first phase derived from changes in land-use and land-management practices. The second phase is the result of the superimposition of 2 factors : intense instream mining of gravel, and the construction of the Levane and La Penna dams.
Combining historical and process perspectives to infer ranges of geomorphic variability and inform river restoration in a wandering gravel-bed river
Analysis of historical sources and aerial photographs of the Clark Fork River's pre-mining, mining, and more recent history suggest that a wandering channel pattern has persisted despite variations in sediment supply and transport capacity
Channel geometry ; Gravelmining ; Human impact ; Meander ; Mississippi ; Oxbow-lake ; Stream ; United States of America
This study uses oxbow lakes to ascertain the extent and nature of change in a river's form, focusing on the effects of post-1950s floodplain gravel extraction on the geomorphology of the Leaf River in southeastern Mississippi, USA. Data from 12
, but has since undergone an average of 2.65 m of degradation in the study reach. Survey data from a nearby USGS stream gage show that degradation began abruptly in the mid 1970s, most likely as a result of in-stream mining and pit avulsions on a major
Pit avulsions and planform change on a mined river floodplain : Tangipahoa River, Louisiana
Channel geometry ; Environmental degradation ; Flood ; Floodplain ; Fluvial capture ; Gravelmining ; Human impact ; Louisiana ; Meander ; Stream ; United States of America
Using geospatial data from the mined Tangipahoa River floodplain for 1980 to 2004, the aims of this study are to (1) assess if pit characteristics such as proximity to channel and size affect the potential for diversion; and (2) interpret
considerably altered by hydroelectric dams, flow diversions, gravelmining, and construction of streambank protection structures. To document these changes, a historical analysis was performed using maps and aerial photographs. In several reaches the planform
Multi-scale characterization and evolution of channel forms in gravel-bed rivers
This study reports the use of a high-resolution 3D laser scanner in the assessment of erosion and deposition volumes in the proglacial zone of Glacier du Ferpècle and Mont Miné, Switzerland. High-resolution data obtained across a braid plain during
Mines and minerals : a treasure house of Latin American research topics
Amérique latine ; Matière première ; Mine ; Minerai ; Recherche
Latin America ; Mine ; Ore;Mineral ; Raw materials ; Research
General comments on the decline of published research on Latin American topics by North American geographers. Brief review of the slim amount of work done on mining topics.―(DWG)