scholarly journals Glacier Changes in the Semi-Arid Huasco Valley, Chile, between 1986 and 2016

Geosciences ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 429
Author(s):  
Katharina Hess ◽  
Susanne Schmidt ◽  
Marcus Nüsser ◽  
Carina Zang ◽  
Juliane Dame
Keyword(s):  
Local Economy ◽  
Economic Activities ◽  
Change Analysis ◽  
Covered Area ◽  
Glacier Changes ◽  
Mining Project ◽  
Multi Temporal ◽  
Rock Glaciers ◽  
Detailed Assessment ◽  
Semi Arid

In the semi-arid and arid regions of the Chilean Andes, meltwater from the cryosphere is a key resource for the local economy and population. In this setting, climate change and economic activities foster water scarcity and resource conflicts. The study presents a detailed glacier and rock glacier inventory for the Huasco valley (28–29° S) in northern Chile based on a multi-temporal remote sensing approach. The results indicate a glacier-covered area of 16.35 ± 3.06 km2 (n = 167) and, additionally, 50 rock glaciers covering an area of about 8.6 km2 in 2016. About 81% of the ice-bodies are smaller than 0.1 km2, and only four glaciers are larger than 1 km2. The change analysis reveals a more or less stable period between 1986 and 2000 and a drastic decline in the glacier-covered area by about 35% between 2000 and 2016. The detailed assessment of six subregions indicates a more pronounced glacier decrease in the vicinity of the Pascua Lama mining project.

scholarly journals On the potential of very high-resolution repeat DEMs in glacial and periglacial environments

2010 ◽  
Vol 4 (1) ◽  
pp. 53-65 ◽  
Author(s):  
J. Abermann ◽  
A. Fischer ◽  
A. Lambrecht ◽  
T. Geist
Keyword(s):  
High Resolution ◽  
Laser Scanning ◽  
Airborne Lidar ◽  
Primary Data ◽  
Glacier Area ◽  
Airborne Laser ◽  
Multi Temporal ◽  
Rock Glaciers ◽  
Data Source ◽  
Very High

Abstract. The potential of high-resolution repeat DEMs was investigated for glaciological applications including periglacial features (e.g. rock glaciers). It was shown that glacier boundaries can be delineated using airborne LIDAR-DEMs as a primary data source and that information on debris cover extent could be extracted using multi-temporal DEMs. Problems and limitations are discussed, and accuracies quantified. Absolute deviations of airborne laser scanning (ALS) derived glacier boundaries from ground-truthed ones were below 4 m for 80% of the ground-truthed values. Overall, we estimated an accuracy of +/−1.5% of the glacier area for glaciers larger than 1 km2. The errors in the case of smaller glaciers did not exceed +/−5% of the glacier area. The use of repeat DEMs in order to obtain information on the extent, characteristics and activity of rock glaciers was investigated and discussed based on examples.

Potential climatic refugia in semi-arid, temperate mountains: Plant and arthropod assemblages associated with rock glaciers, talus slopes, and their forefield wetlands, Sierra Nevada, California, USA

2015 ◽  
Vol 387 ◽  
pp. 106-121 ◽  
Author(s):  
Constance I. Millar ◽  
Robert D. Westfall ◽  
Angela Evenden ◽  
Jeffrey G. Holmquist ◽  
Jutta Schmidt-Gengenbach ◽  
...  
Keyword(s):  
Sierra Nevada ◽  
Rock Glaciers ◽  
Talus Slopes ◽  
Semi Arid

Evidence for Mountain Glacier Changes in Semi-arid Environments based on Remote Sensing Data

2014 ◽  
Vol 42 (4) ◽  
pp. 801-815
Author(s):  
Neamat Karimi ◽  
Manuchehr Farajzadeh ◽  
Ali Moridnejad ◽  
Soodabeh Namdari
Keyword(s):  
Remote Sensing ◽  
Remote Sensing Data ◽  
Arid Environments ◽  
Mountain Glacier ◽  
Sensing Data ◽  
Glacier Changes ◽  
Semi Arid

scholarly journals Seasonal effects of wastewater to the water quality of the Caeté river estuary, Brazilian Amazon

2010 ◽  
Vol 82 (2) ◽  
pp. 467-478 ◽  
Author(s):  
Luci C.C. Pereira ◽  
Marcela C. Monteiro ◽  
Danielly O. Guimarães ◽  
Jislene B. Matos ◽  
Rauquírio M. da Costa
Keyword(s):  
Water Quality ◽  
River Estuary ◽  
Field Measurements ◽  
Local Environment ◽  
Local Economy ◽  
Seasonal Effects ◽  
Economic Activities ◽  
Dry Period ◽  
Biological Resources

Bragança's socioeconomic situation is highly dependent on estuarine and marine biological resources that are influenced by tidal cycles and climatology. Field measurements (hydrological, hydrodynamic and microbiological variables) were taken in the most urbanized zone from Caeté estuary to characterise the quality of the local environment. During the dry period, the estuary was more eutrophic and presented the highest temperature (30.5 °C in Oct./06), salinity (17 psu in Feb./07), pH (8.24 in Feb./07) and fecal coliform (> 1000 MPN/100 ml in Dec./06 and Feb./07) values. The phytoplankton Cyclotella meneghiniana, Coscinodiscus centralis and other r-strategist species were observed. The lack of basic hydric canalization was responsible for the local contamination, especially during the dry period when more concentrated wastewater from the city was emitted into the estuary, showing the human influence on the reduction of local estuarine water quality. In Bragança, the fishery is considered one of the main economic activities so, this contamination is worrisome because a large part of the local economy depends on biological resources and, thus, the contamination could negatively affect the environmental health of this Amazon ecosystem.

scholarly journals Multi-temporal land-cover classification and change analysis with conditional probability networks: the case of Lesvos Island (Greece)

2011 ◽  
Vol 33 (13) ◽  
pp. 4075-4093 ◽  
Author(s):  
Elias Symeonakis ◽  
Peter Caccetta ◽  
Sotirios Koukoulas ◽  
Suzanne Furby ◽  
Nikolaos Karathanasis
Keyword(s):  
Land Cover ◽  
Conditional Probability ◽  
Land Cover Classification ◽  
Change Analysis ◽  
Multi Temporal
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