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Land Subsidence
Published in Frank R. Spellman, Land Subsidence Mitigation, 2017
Flooding events in the Houston area have increased in severity and frequency due to land subsidence. Near the coast, the net result of land subsidence is an apparent increase in sea level, or a relative sea-level rise: the net effect of global sea-level rise and regional land subsidence in the coastal zone. The sea level is in fact rising due to regional and global processes, both natural and human induced. The combined effects of the actual sea-level rise and natural consolidation of the sediments along the Texas Gulf Coast yield a relative sea-level rise from natural causes that locally may exceed 0.08 inches per year (Paine, 1993). Global warming is contributing to the current sealevel rise and is expected to result in a sea-level increase of nearly 4 inches by the year 2050 (Titus and Narayanan, 1995). However, human-induced subsidence has been by far the dominant cause of relative sea-level rise along the Texas Gulf Coast, exceeding 1 inch per year throughout much of the affected area. Extraction of groundwater and to a lesser extent oil and gas has contributed to this subsidence. Subsidence caused by oil and gas production is largely restricted to the field of production, as contrasted to the regional-scale subsidence typically caused by groundwater pumpage.
Introduction
Published in Zahrah Naankwat Musa, Satellite-Based Mitigation and Adaptation Scenarios for Sea Level Rise in the Lower Niger Delta, 2018
The effects of sea level rise (SLR), however, will not be uniform all over the world but will depend on the physical, socio-economical, and anthropogenic conditions of the coastal area. Consequently some areas will experience higher and more rapidly rising sea levels than others. Relative sea level rise is the change in sea levels relative to the land elevation and includes land vertical movement in addition to global sea level rise values. Relative sea level rise values are therefore higher in subsiding coasts like river deltas than the stable coastal areas.
Climate Change Overlays
Published in Gregory T. Haugan, The New Triple Constraints for Sustainable Projects, Programs, and Portfolios, 2016
The National Oceanic and Atmospheric Administration (NOAA) tells us that "sea levels provide an important key to understanding the impact of climate change, not just along our coasts, but around the world. By combining local rates of relative sea level change for a specific area based on observations with projections of global sea level rise (from IPCC4, 2007), coastal managers and engineers should begin to analyze and plan for the impacts of sea level rise for long-range planning."*
Ground infrastructure monitoring in coastal areas using time-series inSAR technology: the case study of Pudong International Airport, Shanghai
Published in International Journal of Digital Earth, 2023
Bei An, Yanan Jiang, Changcheng Wang, Peng Shen, Tianyi Song, Chihao Hu, Kui Liu
With global warming, the global mean sea level continues to rise, which poses a serious challenge to the survival and development of human society (Wang et al. 2021). In 2020, the Department of Marine Early Warning and Monitoring of the Ministry of Natural Resources of China released the 2019 China Sea Level Bulletin. The report states that from 1980-2019, the rate of sea level rise along the coast of China is 3.4 mm/year, which is higher than the global average for the same period. In the past 40 years, the coastal sea level in China has been rising at an accelerated rate. The rising sea level has led to an increase in nearshore wave and tidal energy, and intensified coastal erosion and beach erosion, causing subsidence of varying degrees on the coastal zone ground infrastructure, resulting in serious hazards. And ground subsidence in coastal areas causes relative sea level rise, forming a disaster cycle and increasing the risk of coastal zone hazards.
Melting ice and rising seas – connecting projected change in Antarctica’s ice sheets to communities in Aotearoa New Zealand
Published in Journal of the Royal Society of New Zealand, 2023
Richard Levy, Timothy Naish, Daniel Lowry, Rebecca Priestley, Rachelle Winefield, Alanna Alevropolous-Borrill, Emory Beck, Rob Bell, Graeme Blick, Ruzica Dadic, Tasman Gillies, Nicholas Golledge, Zoe Heine, Stefan Jendersie, Judy Lawrence, Katherine O’Leary, Ryan Paulik, Ceridwyn Roberts, Mike Taitoko, Natalie Trayling
An imperative to understand the impact of sea-level rise across coastal regions in New Zealand (Parliamentary Commissioner for the Environment 2015; Ministry for the Environment 2017, 2022a) is driving our community to better connect knowledge of Antarctic ice sheet behaviour to local factors in Aotearoa. Changes in land-based ice mass and thermal expansion of the world’s oceans are the primary causes of global mean sea-level rise. However, it is local relative sea level change that affects coastal hazards and risk and matters most to coastal communities. Vertical movement of the land surface can have a significant effect on local relative sea level; land subsidence can accelerate climate driven sea-level rise whereas uplift can slow it down. These changes in land surface height can expose coastal inhabitants to rates of sea-level rise up to four times faster than the global mean (Nicholls et al. 2021).
Assessment of potentially vulnerable zones using geospatial approach along the coast of Cuddalore district, East coast of India
Published in ISH Journal of Hydraulic Engineering, 2022
K. S. S. Parthasarathy, Subbarayan Saravanan, Paresh Chandra Deka, Abijith Devanantham
SLR is one of the critical parameters that impact the other physical parameter by inundating into the land as well as affecting the low-lying region posing a great threat to population and natural environment. Global climate change taking place all over the world had been a threat to accelerated SLR affecting the existing shoreline in the worst manner. These coastal zones were exposed due to climate changes, and the consequences are seawater intrusion, SLR, and storm surges (Nicholls et al. 2010; Parthasarathy and Deka 2019; Torresan et al. 2012). Changes in mean sea level as measured by coastal tide gauges are called relative sea-level changes (Church and Gregory 2001). From CVI point of view, coast subjected to a high rate of SLR is considered as a highly vulnerable area and vice versa. Hence, mean relative sea-level data for the entire coast was computed from tide gauges of Permanent Service for Mean Sea Level (PSMSL) and risk rating for the coast is assigned.