Hydrogeochemical indications of regional flow in the Lower Greensand aquifer of the London Basin

2021 ◽  
pp. qjegh2021-028
Author(s):  
W. George Darling ◽  
Melinda A. Lewis
Keyword(s):  
Environmental Isotopes ◽  
Published Data ◽  
Confined Aquifer ◽  
The West ◽  
Content Type ◽  
Regional Flow ◽  
Fresh Perspective ◽  
Southern Side ◽  
Chalk Aquifer ◽  
The City

The Lower Greensand (LGS) forms the second most important aquifer in the London Basin but, being largely absent beneath the city itself, has received much less attention than the ubiquitous overlying Chalk aquifer. While the general directions of groundwater flow in the Chalk are well established, there has been much less certainty about flow in the LGS owing to regionally sparse borehole information. This study focuses on two hitherto uncertain aspects of the confined aquifer: the sources of recharge to the west-central London Basin around Slough, and the fate of LGS water where the aquifer thins out on the flank of the London Platform in the Gravesend–Medway–Sheppey area on the southern side of the basin. The application of hydrogeochemical techniques including environmental isotopes indicates that recharge to the Slough area is derived from the northern LGS outcrop, probably supplemented by downward leakage from the Chalk, while upward leakage from the LGS in North Kent is mixing with Chalk water to the extent that some Chalk boreholes on the Isle of Sheppey are abstracting high proportions of water with an LGS fingerprint. In doing so, this study demonstrates the value of re-examining previously published data from a fresh perspective.Thematic collection: This article is part of the Hydrogeology of Sandstone collection available at: https://www.lyellcollection.org/cc/hydrogeology-of-sandstone

LNA losses may lead to violence elsewhere in Libya

2020 ◽  
Keyword(s):  
Balance Of Power ◽  
Abu Dhabi ◽  
The West ◽  
Content Type ◽  
The City

Significance This is the latest offensive after a series of wins by GNA-aligned groups in western Libya, repelling Haftar’s offensive to take control of the capital, Tripoli and the whole country. Turkey’s official intervention in the conflict since December 2019 in support of the GNA has now fundamentally shifted the balance of power. Impacts Haftar's losses could endanger his position with his external allies in Abu Dhabi and Cairo. The threat of mass reprisals by GNA-aligned forces will make Tarhuna groups fight fiercely -- even if the LNA withdraws from the city. If the GNA eliminates the LNA’s threat in the west, it may look to retake control of the oil crescent.

De Zijpe en de Zuiderzee

2021 ◽  
Vol 6 (2) ◽  
pp. 105-125
Author(s):  
Guus J. Borger
Keyword(s):  
The Netherlands ◽  
Urban Development ◽  
Historical Documents ◽  
Main Function ◽  
Archaeological Research ◽  
The West ◽  
Content Type ◽  
Coastal Barrier ◽  
12Th Century ◽  
The City

Abstract The Zijpe and the Zuiderzee Dutch geologists and archaeologists disagree about the time the Flevo-lakes in the Wet Heart of the Netherlands were connected with the western part of the Waddenzee. Geologists hold the strong view that this connection originated in the centuries bc. Archaeological research revealed, however, that the pre-urban development of the city of Amsterdam did not start until the last quarter of the 12th century ad. This urban development has been considered as an indication that the shipping route between the mouth of the river Amstel and the Waddenzee had improved shortly before. Therefore, archaeologists are convinced that the improvement of this shipping route was forced by the All Saint’s flood of 1170. To the west of Schagen, the sea is considered to have broken up the coastal barrier which led to the development of the Zuiderzee. Because of the etymological relation between the names Flevo and Vlie, the Flevo-lakes must have been already connected with the Waddenzee in the Roman period. Near Medemblik, however, the water did not become brackish before the 8th century ad and more to the south not earlier than the 9th century. Therefore, drainage must have been the main function of the connection between the Flevo-lakes and the Waddenzee for centuries. From historical documents it is known that somewhere around Stavoren a large amount of land was lost to the sea in 1170. Together with the swift development of Amsterdam it is likely that the Zuiderzee came into being after 1170. A breakthrough of the coastal barrier to the west of Schagen at that time, however, is unlikely. In 1170 there was some damage in the northern part of the province of Holland caused by a storm surge, but the loss of land was limited due to the building of several dikes.

Kurdish-Turkish spat may save Islamic State in Syria

2016 ◽  
Keyword(s):  
Second Phase ◽  
Islamic State ◽  
Medium Term ◽  
The West ◽  
Content Type ◽  
The North ◽  
The Us ◽  
The City

Significance The Kurdish-dominated SDF, with weapons and air support from the US-led coalition fighting IS in Iraq and Syria, on November 5 launched a campaign to encircle and eventually seize Raqqa. The Wrath of the Euphrates offensive made some progress against outlying villages to the north of the city, and on December 10 began a second phase to take territory to the west. Impacts Turkish-US relations could worsen as Ankara confronts the SDF and engages more deeply with Moscow. Turkey could use the non-jihadi Syrian opposition in Syria’s north more openly to confront the Kurdish forces. IS, although weakened, will survive into the medium term owing to cleavages and disputes among its many enemies.

Cities-Before-Cities

2017 ◽  
Author(s):  
Daniel W. Berman
Keyword(s):  
Crucial Role ◽  
The West ◽  
Central Greece ◽  
Form And Function ◽  
South Italy ◽  
Crucial Component ◽  
And Function ◽  
The City

Foundation myths are a crucial component of many Greek cities’ identities. But the mythic tradition also represents many cities and their spaces before they were cities at all. This study examines three of these ‘prefoundational’ narratives: stories of cities-before-cities that prepare, configure, or reconfigure, in a conceptual sense, the mythic ground for foundation. ‘Prefoundational’ myths vary in both form and function. Thebes, before it was Thebes, is represented as a trackless and unfortified backwater. Croton, like many Greek cities in south Italy, credited Heracles with a kind of ‘prefounding’, accomplished on his journey from the West back to central Greece. And the Athenian acropolis was the object of a quarrel between Athena and Poseidon, the results of which gave the city its name and permanently marked its topography. In each case, ‘prefoundational’ myth plays a crucial role in representing ideology, identity, and civic topography.

Introduction

2017 ◽  
Author(s):  
George Hoffmann
Keyword(s):  
Chief Editor ◽  
City Council ◽  
The West ◽  
Son Of God ◽  
Warm Summer ◽  
The City

On a warm summer afternoon in 1561, Calvin’s chief editor donned a heavy stole, thick robes, and a gleaming tiara and proceeded to strut and fret his hour upon the stage in a comedy of his own devising. For little more than a century, Christians in the West had celebrated on August 6th Christ’s Transfiguration as the son of God in shining robes. But on this Sunday in Geneva, the city council, consistory, and an audience fresh from having attended edifying sermons at morning service gathered to applaud the transfiguration of the learned Conrad Badius into the title role of ...

Diocletian's Price-Edict at Ptolemais (Cyrenaica)

1955 ◽  
Vol 45 (1-2) ◽  
pp. 106-115 ◽  
Author(s):  
Giacomo Caputo ◽  
Richard Goodchild
Keyword(s):  
Hellenistic Period ◽  
The West ◽  
Italian Government ◽  
Systematic Exploration ◽  
Roman Age ◽  
The City ◽  
Made In ◽  
Late Roman

Introduction.—The systematic exploration of Ptolemais (modern Tolmeita), in Cyrenaica, began in 1935 under the auspices of the Italian Government, and under the direction of the first-named writer. The general programme of excavation took into consideration not only the important Hellenistic period, which gave the city its name and saw its first development as an autonomous trading-centre, but also the late-Roman age when, upon Diocletian's reforms, Ptolemais became capital of the new province of Libya Pentapolis and a Metropolitan See, later occupied by Bishop Synesius.As one of several starting-points for the study of this later period, there was selected the area first noted by the Beecheys as containing ‘heaps of columns’, which later yielded the monumental inscriptions of Valentinian, Arcadius, and Honorius, published by Oliverio. Here excavation soon brought to light a decumanus, running from the major cardo on the west towards the great Byzantine fortress on the east. Architectural and other discoveries made in 1935–36 justified the provisional title ‘Monumental Street’ assigned to this ancient thoroughfare. In terms of the general town-plan, which is extremely regular, this street may be called ‘Decumanus II North’, since two rows of long rectangular insulae separate it from the Decumanus Maximus leading to the West Gate, still erect. The clearing of the Monumental Street and its frontages revealed the well-known Maenad reliefs, attributed to the sculptor Callimachus, a late-Roman triple Triumphal Arch, and fragments of monumental inscriptions similar in character to those previously published from the same area.

Mitigation of road traffic crash hazard in Pakistan

2014 ◽  
Vol 23 (5) ◽  
pp. 567-585
Author(s):  
Muhammad Masood Rafi ◽  
Ashar Hashmat Lodi ◽  
Muhammad Arsalan Effendi
Keyword(s):  
Road Traffic ◽  
Evaluation Model ◽  
Road Traffic Crash ◽  
Potential Hazard ◽  
Suggested Model ◽  
Male Population ◽  
Content Type ◽  
The Road ◽  
On The Road ◽  
The City

Purpose – Road traffic crashes (RTCs) result in creating significant social and economic hazard for affectees, their families and society. The purpose of this paper is to present studies which were conducted to study the patterns of RTCs in Karachi which is a metropolitan city of Pakistan. The studies were conducted on one of the busiest roads in the city named as Shara-e-Faisal. The influence and contribution of different factors in RTCs has been studied and hazardous road sections of Shara-e-Faisal have been identified. Based on the data analysis, an evaluation model has been suggested to reduce the hazard of RTCs on Shara-e-Faisal. The objective of the presented studies is to increase the present level of safety of road travel by reducing crashes on Shara-e-Faisal. Design/methodology/approach – Existing data of RTCs in Karachi have been analysed for the presented studies. For this purpose, Shara-e-Faisal was divided in sections of 1 km length to study the vehicle crash pattern. Location surveys were conducted to record physical conditions of this road. A cluster analysis was carried out to identify hazardous sections of the road. An evaluation model has been suggested in the end to reduce the hazard of RTCs by identifying hazardous road sections of Shara-e-Faisal. Findings – The analysis of the data revealed that the crashes were higher over weekend and on Monday. Male population, particularly young people, and motorcycle riders were the largest affectees of RTCs. In general, more daytime crashes were recorded as compared to nighttime crashes. The crashes in the mid block of the road and those involving rear-end collisions were higher. The hazardous road locations were related to poor road conditions. Statistical analysis indicated that alternate routes were required to reduce the RTC hazard on Shara-e-Faisal. Research limitations/implications – The paper is a small, but an original, contribution to identify a potential hazard which is faced by the community in the city. This is the first attempt (to the best of authors’ knowledge) to address the issue of RTCs in Karachi from an engineering view point. Practical implications – The suggested model can be employed by the authorities as a guideline to mitigate the hazard of road crashes in the country. Originality/value – The paper provides valuable information on the road traffic incidents, their pattern and contributing factors in one of the largest metropolis of Pakistan. The suggested model can become helpful in reducing RTCs in Pakistan.

Social urbanism: public policy and place brand

2019 ◽  
Vol 12 (3) ◽  
pp. 326-337 ◽  
Author(s):  
Caroline Doyle
Keyword(s):  
Public Policy ◽  
Social Problem ◽  
Local Governments ◽  
Structured Interviews ◽  
Content Type ◽  
Study Approach ◽  
Local Stakeholders ◽  
Place Brand ◽  
The City

PurposeThis paper aims to focus on how a public policy designed to address a social problem ultimately became the place brand.Design/methodology/approachThis paper uses a qualitative case study approach focusing on the city of Medellín, Colombia. It draws from fieldwork conducted in Medellín over 2014 and 2015, including semi-structured interviews with an array of local stakeholders.FindingsThe paper concludes that local governments should be aware that the policymaking process can become part of their branding. It also shows the importance of the continual involvement of stakeholders in the place brand process to ensure it is a sustainable brand.Originality/valueThere are limited studies which focus on how a public policy designed to address a social problem ultimately becomes the place brand. This paper shows how a public policy, social urbanism, became the branding of Medellín.

scholarly journals Biological Impact of a Large-Scale Genomic Inversion That Grossly Disrupts the Relative Positions of the Origin and Terminus Loci of theStreptococcus pyogenesChromosome

2019 ◽  
Vol 201 (17) ◽  
Author(s):  
Dragutin J. Savic ◽  
Scott V. Nguyen ◽  
Kimberly McCullor ◽  
W. Michael McShan
Keyword(s):  
Dna Sequences ◽  
Parental Strain ◽  
Large Scale ◽  
Galleria Mellonella ◽  
Acute Infection ◽  
Relative Length ◽  
Published Data ◽  
Rich Medium ◽  
Content Type

ABSTRACTA large-scale genomic inversion encompassing 0.79 Mb of the 1.816-Mb-longStreptococcus pyogenesserotype M49 strain NZ131 chromosome spontaneously occurs in a minor subpopulation of cells, and in this report genetic selection was used to obtain a stable lineage with this chromosomal rearrangement. This inversion, which drastically displaces theorisite relative to the terminus, changes the relative length of the replication arms so that one replichore is approximately 0.41 Mb while the other is about 1.40 Mb in length. Genomic reversion to the original chromosome constellation is not observed in PCR-monitored analyses after 180 generations of growth in rich medium. Compared to the parental strain, the inversion surprisingly demonstrates a nearly identical growth pattern in the first phase of the exponential phase, but differences do occur when resources in the medium become limited. When cultured separately in rich medium during prolonged stationary phase or in an experimental acute infection animal model (Galleria mellonella), the parental strain and the invertant have equivalent survival rates. However, when they are coincubated together, bothin vitroandin vivo, the survival of the invertant declines relative to the level for the parental strain. The accompanying aspect of the study suggests that inversions taking place nearoriCalways happen to secure the linkage oforiCto DNA sequences responsible for chromosome partition. The biological relevance of large-scale inversions is also discussed.IMPORTANCEBased on our previous work, we created to our knowledge the largest asymmetric inversion, covering 43.5% of theS. pyogenesgenome. In spite of a drastic replacement of origin of replication and the unbalanced size of replichores (1.4 Mb versus 0.41 Mb), the invertant, when not challenged with its progenitor, showed impressive vitality for growthin vitroand in pathogenesis assays. The mutant supports the existing idea that slightly deleterious mutations can provide the setting for secondary adaptive changes. Furthermore, comparative analysis of the mutant with previously published data strongly indicates that even large genomic rearrangements survive provided that the integrity of theoriCand the chromosome partition cluster is preserved.

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