WATER TABLE RISE AND ASSOCIATED HAZARDS FOR CALIFORNIA WITH HIGHER SEA LEVEL

2019 ◽  
Author(s):  
Kevin M. Befus ◽  
◽  
Patrick L. Barnard ◽  
Juliette Finzi Hart ◽  
Maya Hayden ◽  
...  
Keyword(s):  
Sea Level ◽  
Water Table ◽  
Water Table Rise

Liquefaction susceptibility maps for the Aqaba–Elat region with projections of future hazards with sea-level rise

2020 ◽  
pp. qjegh2020-039 ◽  
Author(s):  
Abdel-Rahman A. Abueladas ◽  
Tina M. Niemi ◽  
Abdallah Al-Zoubi ◽  
Gideon Tibor ◽  
Mor Kanari ◽  
...  
Keyword(s):  
Sea Level ◽  
Water Table ◽  
Active Faults ◽  
Gulf Of Aqaba ◽  
Susceptibility Map ◽  
Northern Coast ◽  
Borehole Data ◽  
Ground Acceleration ◽  
Liquefaction Susceptibility ◽  
Susceptibility Maps

The cities of Aqaba, Jordan and Elat, Israel are vulnerable to seismic damage because they are built over the active faults of the Dead Sea Transform that are the source of historically destructive earthquakes. A liquefaction susceptibility map was generated for the Aqaba–Elat region. Borehole data from 149 locations and the water table depth were used to calculate effective overburden stress in the Seed–Idriss simplified method. The liquefaction analysis was based on applying a cyclic loading scenario with horizontal peak ground acceleration of 0.3 g in a major earthquake. The liquefaction map, compiled using a GIS platform, shows high and moderate liquefaction susceptibility zones along the northern coast of the Gulf of Aqaba that extend 800 m inland from the shoreline. In Aqaba, several hotels, luxury apartment complexes, archaeological sites, ports and commercial districts are located within high and moderate liquefaction zones. In Elat, the seaport and the coastal hotel district are located within a high susceptibility zone. Most residential areas, schools and hospitals in both cities are located within zones not susceptible to liquefaction based on the methods of this study. The total area with the potential to be liquefied along the Gulf of Aqaba is c. 10 km2. Given predictions for global sea-level, we ran three liquefaction models utilizing projected water table rises of 0.5, 1 and 2 m. These models yielded an increase in the area of high liquefaction ranging from 26 to 49%. Given the high potential of future earthquakes, our liquefaction susceptibility maps should help inform city officials for hazard mitigation planning.

Geoarchaeological and Paleohydrological Evidence for a Clovis-Age Drought in North America and Its Bearing on Extinction

1991 ◽  
Vol 35 (3-Part1) ◽  
pp. 438-450 ◽  
Author(s):  
C. Vance Haynes
Keyword(s):  
North America ◽  
Great Basin ◽  
Water Table ◽  
Marked Decrease ◽  
Northern Europe ◽  
Dry Period ◽  
Human Predation ◽  
Water Table Rise ◽  
Algal Mat ◽  
Game Animals

AbstractAt the Murray Springs Clovis site in southeastern Arizona, stratigraphic and geomorphic evidence indicates that an abnormally low water table 10,900 yr B.P. was followed soon thereafter by a water-table rise accompanied by the deposition of an algal mat (the “black mat”) that buried mammoth tracks, Clovis artifacts, and a well. This water-table fluctuation correlates with pluvial lake fluctuations in the Great Basin during and immediately following Clovis occupation of that region. Many elements of Pleistocene megafauna in North America became extinct during the dry period. Oxygen isotope records show a marked decrease in δ18O correlated with the Younger Dryas cold-dry event of northern Europe which ended 10,750 yr B.P., essentially the same time as the water table began to rise in southeastern Arizona. Clovis hunters may have found large game animals easier prey when concentrated at water holes and under stress. If so, both climate and human predation contributed to Pleistocene extinction in America.

Quantity and Quality of Groundwater in the Campo De Dalias (Almeria, Se Spain)

1991 ◽  
Vol 24 (11) ◽  
pp. 87-96 ◽  
Author(s):  
A. Pulido Bosch ◽  
F. Navarrete ◽  
L. Molina ◽  
J. L. Martinez-Vidal
Keyword(s):  
Water Supply ◽  
Sea Level ◽  
Water Table ◽  
Fruit And Vegetables ◽  
Agricultural Area ◽  
Se Spain ◽  
Great Productivity ◽  
Over Exploitation ◽  
Coastal Strip

The Campo de Dalías is the most economically important agricultural area in the whole of the Province of Almeria. A benign climate combined with the expertise of the market gardeners and their intensive cultivation in plastic hot-houses of out-of-season fruit and vegetables has turned a stony wasteland into an area of great productivity. The main water supply comes from a series of wells drilled into the subterranean aquifers running through the local rocks, a geometrically complex succession of Triassic limestones and dolomites, Miocene conglomerates and calcareous sandstones, Pliocene calcarenites and Quaternary gravels, sands and silts. The annual influx into the aquifers has been calculated as being around 50 Hm3, while at the present day more than 100 Hm3 are being taken out during the same period. This over exploitation of the resources is causing an inexorable descent in the water table, which is leading to marine intrusion in those aquifers nearest the sea. The main aquifer-bearing units are Balanegra and Aguadulce, composed essentially of Triassic, Alpujarride carbonates, and the Balerma-Las Marinas unit, made, up of Pliocene calcarenites. In the water from some of the wells in the Aguadulce unit more than 10,000 microS/cm have been measured at some distance from the coast, while in the Balanegra unit there are a large number of conoids below sea level, although marine intrusion is at present limited to a fairly narrow coastal strip.

Effect of temporary rise of saline water table on dry matter yield of oats (Avena byzantina)

1974 ◽  
Vol 14 (71) ◽  
pp. 811 ◽  
Author(s):  
FG Abd-El-Kaddous
Keyword(s):  
Water Table ◽  
Dry Matter ◽  
Saline Water ◽  
Growth Stages ◽  
Dry Matter Yield ◽  
Water Tables ◽  
Temporary Rise ◽  
Effect On Yield ◽  
Water Table Rise ◽  
Yield Of Oats

In 1968 and 1969, at Kerang, Victoria, the dry matter yield of oats (Avena byzantina) grown on a sodic soil were measured under conditions of fluctuating saline (31 mmhos cm-1) water tables. In each year, a water table was established for 14 days at one of three growth stages and at depths varying from 7.5 to 90 cm. Relative to the yield obtained when the water table remained at 90 cm depth, dry matter yields were reduced by 70 per cent (1968) and 79 per cent (1969) by one temporary water table rise to a depth of 7.5 cm for 14 days. Intermediate reductions in yields occurred when the water tables rose temporarily to intermediate depths from 82.5 cm to 15 cm (7.5 cm intervals). The growth stage at which the water table rise occurred had no significant effect on yield, except in the second period in 1969 when yield was reduced during conditions of high temperature and low evaporation.

Identifying resilient Eastern Massasauga Rattlesnake (Sistrurus catenatus) peatland hummock hibernacula

2018 ◽  
Vol 96 (9) ◽  
pp. 1024-1031 ◽  
Author(s):  
A.G. Smolarz ◽  
P.A. Moore ◽  
C.E. Markle ◽  
J.M. Waddington
Keyword(s):  
Water Table ◽  
Spatial Arrangement ◽  
Subsurface Temperature ◽  
Contributing Factors ◽  
Northern Limit ◽  
Deep Freezing ◽  
Sistrurus Catenatus ◽  
Eastern Massasauga Rattlesnake ◽  
Study Sites ◽  
Water Table Rise

At the northern limit of the Eastern Massasauga Rattlesnake’s (Sistrurus catenatus (Rafinesque, 1818)) range, individuals spend up to half the year overwintering. In hummock hibernacula found in peatlands, it is likely that subsurface temperature and water table position are contributing factors dictating habitat suitability. As a step towards assessing the vulnerability of hibernacula to anthropogenic changes, we combined subsurface temperature and water table dynamics to assess the likelihood that unflooded and unfrozen conditions were present in hummock hibernacula. Our results indicate that taller hummocks are more resilient to an advancing frost line and fluctuating water table by providing a larger area and duration of unfrozen and unflooded conditions, and a critical overwintering depth that is farther from the hummock surface. In two study sites along eastern Georgian Bay, an unflooded and unfrozen zone was present for over 90% of the overwintering period for hummocks taller than 25–27 cm. Our findings highlight the vulnerability of peatland hummocks to variability of winter weather where deep freezing and (or) water table rise may nonlinearly reduce resilience. This suggests that height is not the only component affecting the suitability of hummock hibernacula and that further research should examine the structure and spatial arrangement of hummocks within a peatland.

scholarly journals Carbonate cements in contemporaneous beachrocks, Jaguaribe beach, Itamaracá island, northeastern Brazil: petrographic, geochemical and isotopic aspects

2005 ◽  
Vol 77 (2) ◽  
pp. 343-352 ◽  
Author(s):  
Núbia C. Guerra ◽  
Chang H. Kiang ◽  
Alcides N. Sial
Keyword(s):  
Sea Level ◽  
Water Table ◽  
Groundwater Level ◽  
Interstitial Water ◽  
Northeastern Brazil ◽  
Petrographic Composition ◽  
Beach Ridges ◽  
Carbonate Cements ◽  
Freshwater Influence ◽  
The One

Holocene beachrocks of the Jaguaribe beach, State of Pernambuco, northeastern Brazil, consist of horizontal, cemented layers approximately 40 cm thick. The cement shows three textural varieties: (a) calciferous, surrounding siliciclastic grains, (b) micritic, with an acicular fringe; and (c) cryptocrystalline calcite in pores. Early cementation took place at the water table below beach ridges, where geochemical, hydrodynamic and, perhaps, also microbiological conditions favored rapid precipitation of aragonite and/or high-Mg calcite. delta13C values range from -1.8 to +1.5‰ for dissolved carbonate in interstitial water and from +0.2 to +2.1‰ for bioclastic components. delta18O values range from -2.8 to +0.5‰ for seawater, freshwater and interstitial water. delta13C values and diagenetic features suggest that cementation occurred in meteoric-vadose and/or marine-phreatic water by loss of CO2 during evaporation of the interstitial water. Locally, superimposed low-Mg calcite cements point to subsequent freshwater influence. Total-rock cement composition of vertically stacked beachrock beds at the Jaguaribe beach shows that the highest beachrock bed is older than the one (of same petrographic composition) situated at the current groundwater level. This implies a downward progression of cementation, which probably followed the sea-level fall after a local high stand.

Sign in / Sign up

Export Citation Format

Share Document