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Photogrammetry with a Drone “DJI Phantom 2 Vision Plus”: 3D Model of an Area Deformed by Neotectonics in the Venezuelan Andes
Issue:
Volume 6, Issue 5, October 2017
Pages:
63-68
Received:
24 July 2017
Accepted:
17 August 2017
Published:
4 September 2017
Abstract: A commercial drone was used to acquire a series of images in an area in the Venezuelan Andes characterized by the deformation of a regional strike-slip fault. The digital model obtained by processing the images has allowed to obtain quantitative measurements of the fault displacement and to test geological concepts related to the structure evolution. The test has proven several benefits in applying the drone technology to support the classic geological field work.
Abstract: A commercial drone was used to acquire a series of images in an area in the Venezuelan Andes characterized by the deformation of a regional strike-slip fault. The digital model obtained by processing the images has allowed to obtain quantitative measurements of the fault displacement and to test geological concepts related to the structure evolutio...
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Evolution Characteristics of Urban Functional Land and Its Development Strategy in Oasis City: A Case of Zhangye City, the Hexi Corridors, China
Liang Feng,
Li Qianguo,
Shi Peiji
Issue:
Volume 6, Issue 5, October 2017
Pages:
69-74
Received:
4 September 2017
Published:
4 September 2017
Abstract: The evolution of urban functional land is the spatial reflection of urban functional agglomeration and diffusion, it can profoundly reveal the internal characteristics of urban expansion. This paper applies spatial analysis tools of GIS to explore the spatial-temporal evolution characteristics of residential land, industrial land and public service land in Zhangye City since 1981 so as to provide effective development strategies for the sustainable development of oasis city. The results show that: 1) The urban residential land and public service facilities land have been gradually increasing, and there is a trend of spatial evolution that is spreading from the centre to periphery. However, industry and storage land increased first and decreased after, and it is from dispersing to agglomeration in spatial. The industry and storage land gathers in the industrial park. 2) Zhangye city should break through the development model of a single core and promote the compact development of urban space to form the full-featured urban spatial structure in the future.
Abstract: The evolution of urban functional land is the spatial reflection of urban functional agglomeration and diffusion, it can profoundly reveal the internal characteristics of urban expansion. This paper applies spatial analysis tools of GIS to explore the spatial-temporal evolution characteristics of residential land, industrial land and public service...
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Sustainable Management of Water Resources on the Background of Current Climate Change
Nana Bolashvili,
Tamaz Karalashvili,
Vakhtang Geladze,
Nino Machavariani,
Ana Karalashvili,
Nino Chikhradze,
Geladze Giorgi,
David Kartvelishvili
Issue:
Volume 6, Issue 5, October 2017
Pages:
75-79
Received:
4 August 2017
Accepted:
7 August 2017
Published:
6 September 2017
Abstract: We are all dependent on water. We need it every day, in so many ways. We need it to stay healthy; we need it for growing food, for transportation, irrigation and industry. Under the existing trend of climatic change, serious problems will occur accompanying the intensive migratory processes of the population living in the arid regions. The main goals of the project was increasing local population’s participation in decision-making process on ecological issues by raising their awareness on irrigation water pollution issues, reinforcing them to participate in investigation of the problem in frames of the project, and supporting them to impact on local water resource management policy.
Abstract: We are all dependent on water. We need it every day, in so many ways. We need it to stay healthy; we need it for growing food, for transportation, irrigation and industry. Under the existing trend of climatic change, serious problems will occur accompanying the intensive migratory processes of the population living in the arid regions. The main goa...
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Forbs Rather Than Grasses as Key Factors Affecting Succession of Abandoned Fields - A Case Study from a Subalpine Region of the Eastern Tibet Plateau
Wenjin Li,
Jinhua Li,
Rulan Zhang,
Shuangshuang Liu,
Huakun Zhou,
Buqing Yao,
Meiling Guo,
Fangping Wang
Issue:
Volume 6, Issue 5, October 2017
Pages:
80-87
Received:
28 July 2017
Accepted:
10 August 2017
Published:
8 September 2017
Abstract: An old-field chronosequence in the subalpine region of the Tibetan Plateau were used as a model system to test a hypothesis that forbs drive pathways of successional trajectories in earlier stages of succession and grasses drive the development of vegetation in later successional stages. All old fields were dominated by forbs, which accounted for 65-85% of species richness and abundance. Species richness and total plant abundance significantly increased with time since abandonment. This is in disagreement with ‘humped-back model’. Although no consistent changes in seed size in the different functional groups found over time, however, there was a significant decline for the forbs, legumes, and annuals, except for the 1-year old field. In this species-rich subalpine ecosystem, forbs rather than grasses and sedges were identified as key factors affecting community structure and plant assemblages, whenever in the earlier successional stages or in the later successional stages. These indicated that grassland managers and policy makers should recognize potential role of forbs in biodiversity conservation and ecosystem functioning.
Abstract: An old-field chronosequence in the subalpine region of the Tibetan Plateau were used as a model system to test a hypothesis that forbs drive pathways of successional trajectories in earlier stages of succession and grasses drive the development of vegetation in later successional stages. All old fields were dominated by forbs, which accounted for 6...
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Curie Point Depth from Spectral Analysis of Magnetic Data in the Southeast Tibet
Kai Yang,
Junhui Xing,
Wei Gong,
Chaoyang Li,
Xiaoyang Wu
Issue:
Volume 6, Issue 5, October 2017
Pages:
88-96
Received:
27 June 2017
Accepted:
11 July 2017
Published:
18 September 2017
Abstract: The satellite magnetic anomalies are used to calculate the Curie point depth of the Southeast Tibet by spectral analysis method in the study. The relationship between the Curie point depth and the regional faults or heat flow will be discussed. The results show that the Curie point depth of the study area ranges from 15 km to 36 km and the average depth is 26.3 km. The Curie point depth is cluster-like on the north of the Ailaoshan-Red River Fault, while it is strip-like distribution on the north side. The Curie point depth in the Xiaojiang Fault zone, the Xiaojinhe Fault zone, the Dien Bien Phu Fault zone and the Gaoligong Fault zone are shallow. It could be related to their strong frictional heat induced by these faults. The Curie point depth in the middle Sukhothai Block is shallow, which it is not only related to the Phayao Fault, the Mae Chan Fault and the Nam Ma Fault, but also to the subduction of the Palaeo-Tethys into the Indochina Block. There is a negative but nonlinearly correlation between the heat flow and the Curie point depth in this study area. The areas of low heat flow value correspond to the areas of deep Curie point depth. However, both the high and low heat flow values can be found in the areas of shallow Curie point depth. The possible reason is thought to be related to the low thermal conductivity of the rock.
Abstract: The satellite magnetic anomalies are used to calculate the Curie point depth of the Southeast Tibet by spectral analysis method in the study. The relationship between the Curie point depth and the regional faults or heat flow will be discussed. The results show that the Curie point depth of the study area ranges from 15 km to 36 km and the average ...
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Impact of Climate Change on the Development of Rainfall Intensity, Duration and Frequency Curves in Chiro and Hurso Stations of Eastern Ethiopia
Abeba Tesfay,
Shoeb Quraishi
Issue:
Volume 6, Issue 5, October 2017
Pages:
97-105
Received:
5 June 2017
Accepted:
26 June 2017
Published:
18 September 2017
Abstract: Today environmental issue becomes the biggest concern of humankind because of scientific evidence about the increasing concentration of greenhouse gases in the atmosphere and the changing climate of the Earth. This study was conducted in eastern Ethiopia specifically at Chiro and Hurso stations. The study assessed quantitatively the rainfall Intensity Duration Frequency (IDF) relationships under changing climate condition and compare with the existing rainfall- Intensity Duration- Frequency (IDF) relationships. Rainfall intensity duration and frequency curves were developed using historical rainfall time series data under the assumption that climate is stationary. This assumption is not valid under changing climatic conditions that may shifts in the magnitude and frequency of extreme rainfall. Such shifts in extreme rainfall at the local level demand new regulations for any intervention management as well as changes in design practices. In order to estimate the level of climate change impact on the rainfall Intensity Duration Frequency (IDF) relationships, these changes of the climate variables were applied to Hyetos Temporal Rainfall Disaggregation model to simulate future IDF relationships. From the results can see graphical presentation of IDF curves for return periods of 2, 5, 10, 25, 50 and 100 years for durations of 1, 2, 3, 6, 12 and 24 hours. The comparison results indicate that, difference between rainfall intensities (percentage) of climate change scenario and historic rainfall for 2020s ranges between 1.58% and 10.92% for 2050s, ranges between 0.07% and 20.22% and for 2080s, ranges between 0.71% and 55.93% in Chiro station, respectively. Similarly, in the case of Hurso station, the difference between climate change scenario and historic rainfall for 2020s ranges between1.10% and 27.83% for 2050s ranges between 110.5% and 40.21% and for 2080s that ranges between 19.44% and 67.75%, respectively. Therefore, the outputs of the study indicates that the rainfall magnitude will be different in the future and thereby the decrease and increase in rainfall intensity and magnitude may have major implications on ways in which current and future intervention is designed, operated, and maintained. Therefore, design standards and guidelines currently employed in the study area should be revised with the confirmation of the impacts of climate change.
Abstract: Today environmental issue becomes the biggest concern of humankind because of scientific evidence about the increasing concentration of greenhouse gases in the atmosphere and the changing climate of the Earth. This study was conducted in eastern Ethiopia specifically at Chiro and Hurso stations. The study assessed quantitatively the rainfall Intens...
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