scholarly journals Review of “Climate change overtakes coastal engineering as the dominant driver 
of hydrologic change in a large shallow lagoon 
” by Huang et al.

2020 ◽  
Keyword(s):  
Climate Change ◽  
Coastal Engineering ◽  
Hydrologic Change ◽  
Shallow Lagoon

scholarly journals CLIMATE CHANGE KEY-CHALLENGES IN COASTAL ENGINEERING

2018 ◽  
pp. 33
Author(s):  
Iñigo J. Losada ◽  
Paula Camus ◽  
Alexandra Toimil ◽  
Antonio Espejo ◽  
Cristina Izaguirre
Keyword(s):  
Climate Change ◽  
Climate Change Impacts ◽  
Coastal Engineering ◽  
Coastal Communities ◽  
Decision Makers ◽  
Engineering Practice ◽  
Continuous Growth ◽  
Leading Role ◽  
Coastal Systems ◽  
Impacts Of Climate Change

Coastal engineers play a leading role in assessing climate change impacts in coastal and low-lying areas and in the design and implementation of adaptation solutions to build resilient coastal systems. Given the continuous growth of coastal communities and assets along the world coastlines, the need to protect and preserve natural and socioeconomic coastal systems and the escalating impacts of climate change (Wong et al. 2014), there is an urgent demand by decision makers for coastal engineering practice dealing with risk assessment and adaptation under high levels of uncertainty.

scholarly journals A METHODOLOGY TO PRIORITIZE INVESTMENTS TO REDUCE RISKS IN PORTS

2018 ◽  
pp. 65
Author(s):  
Carmen Castillo ◽  
Álvaro Galán ◽  
Raquel Balmaseda ◽  
Ana María Díaz ◽  
Elena Calcerrada
Keyword(s):  
Climate Change ◽  
Decision Making ◽  
Risk Management ◽  
Structural Response ◽  
Coastal Engineering ◽  
Risk Level ◽  
Decision Making Process ◽  
Wave Loading ◽  
Coastal Structures ◽  
Stochastic Nature

In many countries worldwide, a strong economical effort in the construction of coastal infrastructures has already been faced. Nowadays, due to the financial crisis, most of the efforts are devoted to the conservation and maintenance of coastal structures instead of building new ones. Furthermore, the expected variations in sea level and met-ocean conditions due to climate change modify the stochastic nature of both wave loading and structural response which is different nowadays from that at the time the structures were designed. These facts encourage the coastal engineering community towards the development of reliable risk management and decision-making tools. A key point in the decision-making process is how to prioritize investments when deciding about adaptation or mitigation alternatives. This paper aims at providing a proposal including tips to select among the possible alternatives based on risk analysis and how each alternative modifies the risk level compared to the do-nothing alternative. An example on a Spanish port will be provided for better understanding.

scholarly journals Climate change overtakes coastal engineering as the dominant driver of hydrologic change in a large shallow lagoon

2020 ◽  
Author(s):  
Peisheng Huang ◽  
Karl Hennig ◽  
Jatin Kala ◽  
Julia Andrys ◽  
Matthew R. Hipsey
Keyword(s):  
Climate Change ◽  
Retention Time ◽  
Nutrient Retention ◽  
Climate Projections ◽  
Human Engineering ◽  
Wet Season ◽  
Climate Trend ◽  
Hydrologic Change ◽  
Artificial Channel ◽  
Estuary Management

Abstract. Ecosystems in shallow, micro-tidal lagoons are particularly sensitive to hydrologic changes. Lagoons are also highly complex transitional ecosystems between land and sea, and the signals of direct human disturbance to the lagoon can be confounded by variability of the climate system, but from an effective estuary management perspective the effects of climate versus direct human engineering interventions need to be identified separately. Although many estuarine lagoons have undergone substantial human interventions, such as artificial channels, the effects from the interaction of climate change with engineering interventions have not been well evaluated. This study developed a 3D finite-volume hydrodynamic model to assess changes in hydrodynamics of the Peel-Harvey Estuary, a large chocked-type lagoon, considering how attributes such as water retention time, salinity and stratification have responded to a range of factors, focusing on the drying climate trend and the opening of a large artificial channel over the period from 1970 to 2016, and how they will evolve under current climate projections. The results show that the drying climate has fundamentally changed the hydrology by comparable magnitudes to that of the opening of the artificial channel, and also highlight the complexity of their interacting impacts. Firstly, the artificial channel successfully improved the estuary flushing by reducing average water ages by 20–110 days; while in contrast the reduced precipitation and catchment inflow had a gradual opposite effect on the water ages, and during the wet season this has almost counteracted the reduction brought about by the channel. Secondly, the drying climate caused an increase in the salinity of the lagoon by 10–30 PSU; whilst the artificial channel increased the salinity during the wet season, it has reduced the likelihood of hypersalinity (> 40 PSU) during the dry season in some areas. The impacts also varied spatially in this large lagoon. The southern estuary, which has the least connection with ocean through the natural channel, is the most sensitive to climate change and the opening of the artificial channel. The projected future drying climate is shown to slightly increase the retention time and salinity in the lagoon, and increase the hypersalinity risk in the rivers. The significance of these changes for nutrient retention and estuary ecology are discussed, highlighting the importance of these factors when setting up monitoring programs, environmental flow strategies and nutrient load reduction targets.

scholarly journals Canadian Continental-Scale Hydrology under a Changing Climate: A Review

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 906
Author(s):  
Tricia A. Stadnyk ◽  
Stephen J. Déry
Keyword(s):  
Climate Change ◽  
Prediction Models ◽  
Global Climate ◽  
Regional Scale ◽  
Resource Planning ◽  
Drainage Basins ◽  
Continental Scale ◽  
Global Mean Temperature ◽  
Northern Regions ◽  
Hydrologic Change

Canada, like other high latitude cold regions on Earth, is experiencing some of the most accelerated and intense warming resulting from global climate change. In the northern regions, Arctic amplification has resulted in warming two to three times greater than global mean temperature trends. Unprecedented warming is matched by intensification of wet and dry regions and hydroclimatic cycles, which is altering the spatial and seasonal distribution of surface waters in Canada. Diagnosing and tracking hydrologic change across Canada requires the implementation of continental-scale prediction models owing the size of Canada’s drainage basins, their distribution across multiple eco- and climatic zones, and the scarcity and paucity of observational networks. This review examines the current state of continental-scale climate change across Canada and the anticipated impacts to freshwater availability, including the role of anthropogenic regulation. The review focuses on continental and regional-scale prediction that underpins operational design and long-term resource planning and management in Canada. While there are significant process-based changes being experienced within Canadian catchments that are equally—if not more so—critical for community water availability, the focus of this review is on the cumulative effects of climate change and anthropogenic regulation for the Canadian freshwater supply.

Climate change on the Yucatan Peninsula during the Little Ice Age

2005 ◽  
Vol 63 (2) ◽  
pp. 109-121 ◽  
Author(s):  
David A. Hodell ◽  
Mark Brenner ◽  
Jason H. Curtis ◽  
Roger Medina-González ◽  
Enrique Ildefonso-Chan Can ◽  
...  
Keyword(s):  
Climate Change ◽  
Little Ice Age ◽  
Yucatan Peninsula ◽  
Sediment Cores ◽  
Ice Age ◽  
Caribbean Region ◽  
15Th Century ◽  
Yucatán Peninsula ◽  
Hydrologic Change ◽  
Historical Accounts

We studied a 5.1-m sediment core from Aguada X'caamal (20° 36.6′N, 89° 42.9′W), a small sinkhole lake in northwest Yucatan, Mexico. Between 1400 and 1500 A.D., oxygen isotope ratios of ostracod and gastropod carbonate increased by an average of 2.2‰ and the benthic foraminifer Ammonia beccarii parkinsoniana appeared in the sediment profile, indicating a hydrologic change that included increased lake water salinity. Pollen from a core in nearby Cenote San José Chulchacá showed a decrease in mesic forest taxa during the same period. Oxygen isotopes of shell carbonate in sediment cores from Lakes Chichancanab (19° 53.0′N, 88° 46.0′W) and Salpeten (16° 58.6′N, 89° 40.5′W) to the south also increased in the mid-15th century, but less so than in Aguada X'caamal. Climate change in the 15th century is also supported by historical accounts of cold and famine described in Maya and Aztec chronicles. We conclude that climate became drier on the Yucatan Peninsula in the 15th century A.D. near the onset of the Little Ice Age (LIA). Comparison of results from the Yucatan Peninsula with other circum-Caribbean paleoclimate records indicates a coherent climate response for this region at the beginning of the LIA. At that time, sea surface temperatures cooled and aridity in the circum-Caribbean region increased.

scholarly journals Climate-induced hydrologic change in the source region of the Yellow River: a new assessment including varying permafrost

2018 ◽  
Author(s):  
Pan Wu ◽  
Sihai Liang ◽  
Xu-Sheng Wang ◽  
Yuqing Feng ◽  
Jeffrey M. McKenzie
Keyword(s):  
Climate Change ◽  
Human Activities ◽  
Yellow River ◽  
Source Region ◽  
The Yellow River ◽  
Observation Data ◽  
Total Change ◽  
Hydrologic Change ◽  
Long Term Observation ◽  
The Impact

Abstract. The source region of the Yellow River (SRYR) provides 35 % of the rivers annual discharge but is very sensitive to the climate change. The change in discharge from the SRYR has been attributed to both climatic and anthropogenic forces, and previous estimates of the impact of human activities on the change in discharge have been higher than 50 % of the total change. Considering the very low population density and limited land use change, this result is potentially inconsistent. Our study modifies the traditional Budyko separating approach to identify and quantify the climatic causes in discharge changes. Application of this new approach to the SRYR now highlights the role of the degrading permafrost, based on long-term observation data of the maximum frozen depth (MFD). Our results show that over the past half-century, the change in discharge in the SRYR was primarily controlled by climate change rather than local human activities. Increasing air temperature is generally a negative force on discharge whereas it also causes permafrost to degrade – a positive factor on discharge generation. Such conflicting effects enhance the uncertainty in assessments of the hydrological response to climate change in the SRYR.

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