scholarly journals Monitoring long-term shoreline dynamics and human activities in the Hangzhou Bay, China, combining daytime and nighttime EO data

2020 ◽  
Vol 4 (3) ◽  
pp. 242-264
Author(s):  
Lixia Chu ◽  
Francis Oloo ◽  
Martin Sudmanns ◽  
Dirk Tiede ◽  
Daniel Hölbling ◽  
...  
Keyword(s):  
Human Activities ◽  
Hangzhou Bay ◽  
Shoreline Dynamics

Impacts of human activities on coral reef ecosystems of southern Taiwan: A long-term study

2012 ◽  
Vol 64 (6) ◽  
pp. 1129-1135 ◽  
Author(s):  
Pi-Jen Liu ◽  
Pei-Jie Meng ◽  
Li-Lian Liu ◽  
Jih-Terng Wang ◽  
Ming-Yih Leu
Keyword(s):  
Coral Reef ◽  
Human Activities ◽  
Term Study ◽  
Long Term Study ◽  
Coral Reef Ecosystems ◽  
Southern Taiwan

scholarly journals Monitoring the Spatial and Temporal Variations in The Water Surface and Floating Algal Bloom Areas in Dongting Lake Using a Long-Term MODIS Image Time Series

2020 ◽  
Vol 12 (21) ◽  
pp. 3622
Author(s):  
Mengmeng Cao ◽  
Kebiao Mao ◽  
Xinyi Shen ◽  
Tongren Xu ◽  
Yibo Yan ◽  
...  
Keyword(s):  
Water Quality ◽  
Human Activities ◽  
Water Surface ◽  
Algal Bloom ◽  
Environmental Changes ◽  
Climatic Factors ◽  
Dongting Lake ◽  
Dynamic Learning ◽  
Traditional Methods

Significant water quality changes have been observed in the Dongting Lake region due to environmental changes and the strong influence of human activities. To protect and manage Dongting Lake, the long-term dynamics of the water surface and algal bloom areas were systematically analyzed and quantified for the first time based on 17 years of Moderate Resolution Imaging Spectroradiometer (MODIS) observations. The traditional methods (index-based threshold algorithms) were optimized by a dynamic learning neural network (DL-NN) to extract and identify the water surface area and algal bloom area while reducing the extraction complexity and improving the extraction accuracy. The extraction accuracy exceeded 94.5% for the water and algal bloom areas, and the analysis showed decreases in the algal bloom and water surface areas from 2001–2017. Additionally, the variations in the water surface and algal bloom areas are greatly affected by human activities and climatic factors. The results of these analyses can help us better monitor human contamination in Dongting Lake and take measures to control the water quality during certain periods, which is crucial for future management. Moreover, the traditional methods optimized by the DL-NN used in this study can be extended to other inland lakes to assess and monitor long-term temporal and spatial variations in algal bloom areas and can also be used to acquire baseline information for future assessments of the water quality of lakes.

scholarly journals Identifying challenges to enforcement in protected areas: empirical insights from 15 Colombian parks

Oryx ◽  
2015 ◽  
Vol 50 (2) ◽  
pp. 317-322 ◽  
Author(s):  
Christoph Nolte
Keyword(s):  
Protected Areas ◽  
Land Tenure ◽  
Human Activities ◽  
Field Research ◽  
Livestock Grazing ◽  
Regulatory Enforcement ◽  
Empirical Field

AbstractProtected areas are intended to conserve biodiversity by restricting human activities within their boundaries. However, such restrictions are difficult to enforce fully in many tropical parks. Improving regulatory enforcement requires an understanding of prevailing challenges to detection and sanctioning activities. Drawing from empirical field research in 15 Colombian parks, I show that current enforcement efforts may be insufficient to deter most priority threats. For long-term infractions, such as agriculture, livestock grazing, and construction, sanctioning violators is challenging, whereas for furtive infractions, such as logging and hunting, it may be difficult to detect violators. Investment in staff, equipment and infrastructure may fail to increase enforcement capacity and yield positive conservation outcomes unless accompanied by resolution of land tenure, clarification of use rights, improved patrolling strategies and protection of park guards.

Long-term deforestation in NW Spain: linking the Holocene fire history to vegetation change and human activities

2011 ◽  
Vol 30 (1-2) ◽  
pp. 161-175 ◽  
Author(s):  
Joeri Kaal ◽  
Yolanda Carrión Marco ◽  
Eleni Asouti ◽  
Maria Martín Seijo ◽  
Antonio Martínez Cortizas ◽  
...  
Keyword(s):  
Human Activities ◽  
Vegetation Change ◽  
Fire History ◽  
Nw Spain ◽  
The Holocene

The Expanding Sahara

1974 ◽  
Vol 1 (1) ◽  
pp. 5-13 ◽  
Author(s):  
J. L. Cloudsley-Thompson
Keyword(s):  
Human Activities ◽  
Shifting Cultivation ◽  
Human Population ◽  
Arid Regions ◽  
Climatic Changes ◽  
The South

The belts of savanna lying to the south of the Sahara are described. Evidence is then presented which suggests that these have been created from forest by shifting cultivation and the use of fire: they have probably developed contemporaneously with the evolution of Man and increase in human population. The effect of climatic changes in creating desert are discussed, and the conclusion is reached that present conditions in much of the Sahara have been engendered almost entirely by human activities. These include felling of trees for firewood and charcoal, or to make their leaves accessible to stock in times of drought and, even more important, overgrazing—especially by goats. Finally, it is suggested that, in the long term, agriculture may not be the most promising way of developing arid regions. Overstocking the savanna and desert must inevitably lead to disaster.

scholarly journals Past and Future Earth: Archaeology and Soil Studies on Ambergris Caye, Belize

2016 ◽  
Author(s):  
Elizabeth Graham ◽  
Richard I. Macphail ◽  
John Crowther ◽  
Simon Turner ◽  
Julia Stegemann ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Human Activities ◽  
Soil Formation ◽  
Formation Processes ◽  
Amazonian Dark Earths ◽  
Anthropogenic Deposits ◽  
Ambergris Caye ◽  
Coral Islands

Marco Gonzalez is one of a number of Maya sites on Belize’s coast and cayes (coral islands) that exhibit anomalous vegetation and dark-coloured soils. Like Amazonian Dark Earths (ADEs), the soils are sought locally for cultivation and are underlain by anthropogenic deposits. Our research is aimed at assessing the role of the anthropogenic deposits in soil formation processes with a view to developing strategies to quantify the long-term environmental impact of human activities today.

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