A potential tipping point in the thermal regime of a warm monomictic reservoir under climate change using three-dimensional hydrodynamic modeling

Inland Waters ◽  
2021 ◽  
pp. 1-20
Author(s):  
Behnam Zamani ◽  
Manfred Koch ◽  
Ben R. Hodges
Keyword(s):  
Climate Change ◽  
Thermal Regime ◽  
Three Dimensional ◽  
Hydrodynamic Modeling ◽  
Tipping Point ◽  
Warm Monomictic Reservoir

scholarly journals THREE-DIMENSIONAL GEOLOGICAL MODELING OF OIL SATURATION OF PRODUCTIVE OIL RESERVOIR BASED ON LEVERETT J-FUNCTION

2016 ◽  
pp. 7-10
Author(s):  
Ya. O. Antipin
Keyword(s):  
Porous Media ◽  
Transition Zone ◽  
Reliable Method ◽  
Three Dimensional ◽  
Hydrodynamic Modeling ◽  
Oil Reservoirs ◽  
Oil Reservoir ◽  
Geological Modeling ◽  
Oil Saturation ◽  
The Impact

The author suggests and describes the most optimal, reliable method for modeling saturation of the productive oil reservoirs The method takes into account the impact of capillary forces in porous media, water-oil transition zone. This method most fully meets the modern requirements of threedimensional geological and hydrodynamic modeling.

scholarly journals A review of seawater intrusion in the Nile Delta groundwater system – the basis for assessing impacts due to climate changes and water resources development

2013 ◽  
Vol 10 (8) ◽  
pp. 10873-10911 ◽  
Author(s):  
M. B. Mabrouk ◽  
A. Jonoski ◽  
D. Solomatine ◽  
S. Uhlenbrook
Keyword(s):  
Climate Change ◽  
Nile Delta ◽  
Groundwater Resources ◽  
Scientific Evidence ◽  
Three Dimensional ◽  
Water Levels ◽  
Population Increase ◽  
Regional Process ◽  
Environmentally Sound ◽  
Resources Development

Abstract. Serious environmental problems are emerging in the River Nile basin and its groundwater resources. Recent years have brought scientific evidence of climate change and development-induced environmental impacts globally as well as over Egypt. Some impacts are subtle, like decline of the Nile River water levels, others are dramatic like the salinization of all coastal land in the Nile Delta – the agricultural engine of Egypt. These consequences have become a striking reality causing a set of interconnected groundwater management problems. Massive population increase that overwhelmed the Nile Delta region has amplified the problem. Many researchers have studied these problems from different perspectives using different methodologies, following different objectives and, consequently, arrived at different findings. However, they all confirmed that significant groundwater salinization has affected the Nile Delta and this is likely to become worse rapidly in the future. This article presents, categorizes and critically analyses and synthesizes the most relevant research regarding climate change and development challenges in relation to groundwater resources in the Nile Delta. It is shown that there is a gap in studies that focus on sustainable groundwater resources development and environmentally sound protection as an integrated regional process in Nile Delta. Moreover, there is also a knowledge gap related to the deterioration of groundwater quality. The article recommends further research that covers the groundwater resources and salinization in the whole Nile Delta based on integrated three-dimensional groundwater modelling of the Nile delta aquifer.

Wind effects change in Taihu Lake with climate change background

2021 ◽  
Author(s):  
Sien Liu ◽  
Qinghua Ye ◽  
Jie Zhou
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Shallow Lakes ◽  
Taihu Lake ◽  
Three Dimensional ◽  
Reference Scenario ◽  
Wind Condition ◽  
Water Age ◽  
Climate Change Effects ◽  
Wind Events

<p>Large shallow lakes globally are threatened by eutrophication, and climate change is believed to aggregate the situation. Wind, as the most important momentum source and the major contributor to consistently change the hydrodynamic patterns inside the large shallow lakes, is highly susceptible to climate change. Taihu Lake, which is the 3<sup>rd</sup> largest shallow lake in China and pertains crucial social and economic values, is chosen in this study as an example. Due to climate change, the wind condition of Taihu Lake shows a significantly decreasing trend of wind speed and the frequency of extreme wind events. Previous studies have paid little attention to the climate change effects on wind hydrodynamics and its implications on water quality has not yet been thoroughly described. Here in this study, we use a well-calibrated and validated three-dimensional Delft3D model to investigate the spatial and temporal heterogeneity of wind induced hydrodynamics and its water quality implications with climate change. The model results give a prediction of less current speed, lower wave height and bottom shear stress compared to the reference scenario, while the three dimensionality of flow field remains. Further, water age is used to demonstrate the influence of external nutrient sources, i.e. the input from adjacent river networks in the basin. Large water ages are observed and potentially it would enhance the accumulation of nutrients and deterioration of water quality.</p>

A Forested Wetland at the Tipping-Point: 17-Year, Demographic Evidence of Widespread Recruitment Failure Due to Climate Change

2021 ◽  
Author(s):  
Jonathan P. Evans ◽  
Sarah McCarthy-Neumann ◽  
Angus Pritchard ◽  
Jennifer Cartwright ◽  
William Wolfe
Keyword(s):  
Climate Change ◽  
Tipping Point ◽  
Forested Wetland ◽  
Recruitment Failure

scholarly journals Late-Holocene changes in character and behaviour of land-terminating glaciers on James Ross Island, Antarctica

2012 ◽  
Vol 58 (212) ◽  
pp. 1176-1190 ◽  
Author(s):  
Jonathan L. Carrivick ◽  
Bethan J. Davies ◽  
Neil F. Glasser ◽  
Daniel Nývlt ◽  
Michael J. Hambrey
Keyword(s):  
Climate Change ◽  
Sediment Transport ◽  
Surface Structure ◽  
Antarctic Peninsula ◽  
Thermal Regime ◽  
Late Holocene ◽  
Negative Mass ◽  
Warming Climate ◽  
James Ross Island ◽  
Geometric Changes

AbstractVirtually no information is available on the response of land-terminating Antarctic Peninsula glaciers to climate change on a centennial timescale. This paper analyses the topography, geomorphology and sedimentology of prominent moraines on James Ross Island, Antarctica, to determine geometric changes and to interpret glacier behaviour. The moraines are very likely due to a late-Holocene phase of advance and featured (1) shearing and thrusting within the snout, (2) shearing and deformation of basal sediment, (3) more supraglacial debris than at present and (4) short distances of sediment transport. Retreat of ~100 m and thinning of 15–20 m has produced a loss of 0.1 km3 of ice. The pattern of surface lowering is asymmetric. These geometrical changes are suggested most simply to be due to a net negative mass balance caused by a drier climate. Comparisons of the moraines with the current glaciological surface structure of the glaciers permits speculation of a transition from a polythermal to a cold-based thermal regime. Small land-terminating glaciers in the northern Antarctic Peninsula region could be cooling despite a warming climate.

Conflicts in adaptation: case studies from Nepal and the Maldives

2019 ◽  
Vol 28 (3) ◽  
pp. 304-318 ◽  
Author(s):  
Phu Doma Lama ◽  
Per Becker
Keyword(s):  
Climate Change ◽  
Participant Observation ◽  
Qualitative Interviews ◽  
Case Study Research ◽  
Three Dimensional ◽  
Disaster Risk ◽  
Three Dimensions ◽  
Critical Examination ◽  
Content Type

Purpose Adaptation appears to be regarded as a panacea in policy circles to reduce the risk of impending crises resulting from contemporary changes, including but not restricted to climate change. Such conceptions can be problematic, generally assuming adaptation as an entirely positive and non-conflictual process. The purpose of this paper is to challenge such uncritical views, drawing attention to the conflictual nature of adaptation, and propose a theoretical framework facilitating the identification and analysis of conflicts in adaptation. Design/methodology/approach The study is based on case study research using first-hand narratives of adaptation in Nepal and the Maldives collected using qualitative interviews, participant observation and document analysis. Findings The findings identify conflicts between actors in, and around, communities that are adapting to changes. These conflicts can be categorized along three dimensions: qualitative differences in the type of conflict, the relative position of conflicting actors and the degree of manifestation of the conflict. Originality/value The three-dimensional Adaptation Conflict Framework facilitate analysis of conflicts in adaptation, allowing for a critical examination of subjectivities inherent in the adaptation discourses embedded in disaster risk reduction and climate change adaptation research and policy. Such an inquiry is crucial for interventions supporting community adaptation to reduce disaster risk.

scholarly journals Early Spawning by the American Brook Lamprey (Lethenteron appendix) in Southeastern Minnesota

2013 ◽  
Vol 126 (3) ◽  
pp. 204 ◽  
Author(s):  
Philip A. Cochran ◽  
Mark A. Ross ◽  
Thomas S. Walker ◽  
Trevor Biederman
Keyword(s):  
Climate Change ◽  
Water Temperature ◽  
Thermal Regime ◽  
Historical Data ◽  
Upper Midwest ◽  
Brook Lamprey ◽  
The Mean

Record-setting warm temperatures in the upper Midwest during early 2012 resulted in early spawning by the American Brook Lamprey (Lethenteron appendix) in southeastern Minnesota. American Brook Lampreys in a total of five streams in three drainages spawned up to one month earlier than typical. Mean day of year of spawning groups observed in 2012 was significantly different from the mean for groups observed during the period 2002–2010, but mean water temperature was not significantly different. Limited historical data are not sufficient to show an effect of climate change on spawning phenology because some data are confounded with the effects of latitude and year-to-year variability in thermal regime.

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