scholarly journals Evaluating Potential Ground Subsidence Geo-Hazard of Xiamen Xiang’an New Airport on Reclaimed Land by SAR Interferometry

2020 ◽  
Vol 12 (17) ◽  
pp. 6991 ◽  
Author(s):  
Guanchen Zhuo ◽  
Keren Dai ◽  
Huina Huang ◽  
Shengpeng Li ◽  
Xianlin Shi ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Planning ◽  
Land Reclamation ◽  
Sar Interferometry ◽  
Ground Subsidence ◽  
Large Area ◽  
Potential Threat ◽  
Reclaimed Land ◽  
The Future ◽  
Dredger Fill

The land reclaimed from the seaside may have a long-term subsidence trend, which poses a potential geohazard in the future land use. Xiamen Xiang’an New Airport (XXNA) is built on reclaimed land since 2016. Based on the spaceborne Sentinel-1 data between January 2018 to April 2019 and the time series interferometric synthetic aperture radar (InSAR) technique, this paper analyzed the reclaimed land subsidence evolution at XXNA in this period. InSAR measurements show that XXNA is suffering from severe subsidence, mainly in three regions because of the earth and sand compacting. By analyzing the spatial subsidence characterizations of the main subsiding areas combined with historical land reclamation and future land use planning, we find the potential threat of subsidence to future land use. Correlation between subsidence and the period of reclamation was found, indicating that the consolidation and compression in dredger fill is the main cause of subsidence. By combining subsidence monitoring results with different land use types and adopting the Expectation (Ex) and Entropy (En) methods, we analyzed the key area with potential subsidence geo-hazard. This work shows that with SAR interferometry, it is possible to find the large area ground subsidence in the airport reclaimed area. The areas with potential subsidence geo-hazards are consistent with the deep reclaimed earth, which means high subsidence risk in the future.

Vacuum preloading consolidation of reclaimed land: a case study

1998 ◽  
Vol 35 (5) ◽  
pp. 740-749 ◽  
Author(s):  
J Q Shang ◽  
M Tang ◽  
Z Miao
Keyword(s):  
Land Reclamation ◽  
Soil Improvement ◽  
Large Area ◽  
Vacuum Preloading ◽  
Reclaimed Land ◽  
Improvement Project ◽  
Prefabricated Vertical Drains ◽  
Vertical Drains ◽  
Soft Clays

This case study presents the design, operation, and results of a soil improvement project using the vacuum preloading method on 480 000 m2 of reclaimed land in Xingang Port, Tianjing, China. The areas treated with vacuum ranged from 5000 to 30 000 m2. The effects of soil improvement are demonstrated through the average consolidation settlement of 2.0 m and increases in undrained shear strengths by a factor of two to four or more. The study shows that the vacuum method is an effective tool for the consolidation of very soft, highly compressive clayey soils over a large area. The technique is especially feasible in cases where there is a lack of surcharge loading fills, extremely low shear strength, soft ground adjacent to critical slopes, and access to a power supply.Key words: vacuum preloading consolidation, soil improvement, soft clays, land reclamation, prefabricated vertical drains.

Upwards from the Plateau

1968 ◽  
Vol 44 (2) ◽  
pp. 11-13
Author(s):  
G. H. Bayly
Keyword(s):  
Land Use ◽  
Forest Management ◽  
Land Management ◽  
Wildlife Management ◽  
Land Use Planning ◽  
Regional Planning ◽  
Leadership Role ◽  
Forest Land ◽  
The Future

The development of the forester's leadership role in forest land management is compared to rising profile of land between a sea or lake shoreline and a range of mountains, the progression is upward but the rate of climb changes. No plateau is identified. Reference is made to forestry leadership in several fields of forest land management; administration, land use, planning, research, forest management, recreational land use and fish and wildlife management. It is noted that forest land management includes activities for which foresters were not academically trained and reference is made to the fact that non-foresters, e.g. biologists and geographers are giving leadership in forest land management and thus providing beneficial competition and stimulation. The most important leadership role in the future may relate to regional planning. The forestry profession is cautioned not to abdicate this field to those in other disciplines.

Engaging Regional Stakeholders in Scenario Planning for the Long-Term Preservation of Ecosystem Services in Northwestern Virginia

2019 ◽  
Vol 3 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Iara Lacher ◽  
Thomas Akre ◽  
William J. McShea ◽  
Marissa McBride ◽  
Jonathan R. Thompson ◽  
...  
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Ecosystem Services ◽  
Land Use Planning ◽  
Scenario Planning ◽  
Scenario Development ◽  
Change Models ◽  
Shenandoah Valley ◽  
The Future

This case study describes the application of a framework for developing stakeholder-driven scenarios of the future. The purpose of these scenarios is to inform land use planning toward the protection of ecosystems and derivable ecosystem services in Northwestern Virginia. We held two scenario development workshops with regional experts in conservation, agriculture, land use planning, policy, and economic development to create scenarios of land use in the northern Piedmont and northern Shenandoah Valley of Virginia. We structured the workshops around a framework that guided stakeholders through several steps eventually resulting in four unique scenarios describing the region in 50 years. Scenario narratives were defined by the intersection of highly influential and uncertain drivers of change relevant to land use planning and ecosystem services. Participants from the northern Shenandoah Valley region selected population growth and climate change adaptation as their scenario defining drivers, while participants from the northern Piedmont region selected planning strategy and climate change impact as their scenario defining drivers. Participants fleshed out scenarios into descriptive narratives that incorporated qualitative and quantitative measures of change. Details from the scenario narratives informed land use change models to further quantify tradeoffs between land use planning decisions and ecosystem services. Individuals interested in using scenario planning to guide research efforts, conservation, or land use planning, or even to broaden perspectives on how to view the future, will find value in this case study.

scholarly journals Geo-environmental Assessment of Al-Ramtha Soils, Jordan

2015 ◽  
Vol 10 (2) ◽  
pp. 386-397 ◽  
Author(s):  
Saeb Al- Shereideh ◽  
Mohammad Wahsha ◽  
Nazem El-Radaideh ◽  
Ahmed Al-Taani ◽  
Nabeel Abderahman ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Land Use ◽  
Environmental Assessment ◽  
Land Use Planning ◽  
Agricultural Development ◽  
Decision Makers ◽  
Soil Genesis ◽  
The Future

This study aims to characterize the pollution conditions by measuring the concentrations of selected heavy metals. It also intends to investigate the relations between soil genesis and lithology. This provides knowledge about the future of the agricultural development in the area and helps decision makers in the land use planning.

scholarly journals Optimization of Land Reuse Structure in Coal Mining Subsided Areas Considering Regional Economic Development: A Case Study in Pei County, China

2020 ◽  
Vol 12 (8) ◽  
pp. 3335
Author(s):  
Zhen Li ◽  
Songlin Wu ◽  
Shiwen Zhang ◽  
Chaojia Nie ◽  
Yong Li ◽  
...  
Keyword(s):  
Land Use ◽  
Economic Development ◽  
Regional Development ◽  
Coal Mining ◽  
Landscape Structure ◽  
Land Reclamation ◽  
Eastern China ◽  
Integrated Model ◽  
Reclaimed Land ◽  
Land Use Structure

Land subsidence, which has caused large-scale settlement loss and farmland degradation, was regarded as the main constraint for land reclamation in the High Groundwater Coal Basins (HGCBs) in the eastern China plain. Both coal mining and agricultural production are important for regional development in this area. In general, the land reclamation direction in this area is greatly affected by the adequacy of filling materials and the land use demand of regional economic development. Taking seven coal mining subsided areas in Pei county, located in the eastern China plain, for example, this study proposed an integrated model (including the Limit Condition model, Logistic Regression model, Grey Linear Programming model and the conversion of land use and its effects at small regional extent (CLUE-S) model) to simulate and optimize the post-mining land use structure to meet the economic development needs of Pei county. Then, the post-mining land use structure under different scenarios, which were set based on the subsidence depth, were compared to explore the optimal collapse depth for separating the damaged land into the filling area and non-filling area. The landscape structure, ecological benefits, engineering quantity and reclaimed farmland area were used to compare the reclaimed land use structure of different scenarios. The results showed that the integrated model could efficiently simulate the reclaimed land use structure to meet the land demand for regional development. The optimal collapse depth for separating the damaged area into the filling area and non-filling area was 2.6 m. Currently, the reclaimed land use structure not only needs a low quantity of filling material, but also obtains a good landscape structure and elevated ecosystem services value. Furthermore, the reclaimed urban land was mainly distributed around Pei town, and the reclaimed farmland was mostly distributed in the area between Pei town and Weishan lake, which were consistent with the pattern of urbanization. The study provides valuable information for future land use plans for Pei county and will contribute to the methods of post-mining land reclamation in other HGCBs.

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