Hydraulic Analysis of a Self-Cleaning Drainage Outlet at the Hellenistic City of Priene

At the distal western end of a main drainage canal running along West Gate Street in the Hellenistic city of Priene, an unusual masonry outlet structure has been found. The housed structure contains a doubly curvilinear, contracting rectangular cross-section flow passageway that allows drainage water flow through the city perimeter wall. A computer model of the complexly-shaped drainage structure has been hydraulically analysed in order to determine the function of the curvilinear passageway. Results indicate that the internal shaping of the structure hydraulically conditions the flow to create multiple circulatory mixing flows that agitate and entrain debris in the outflow stream sufficient to “self-clean” the outlet, thus preventing clogging. Further calculations of flow free surface shapes at different flow rates indicate the maximum flow capacity that can be processed by the drainage system without overspillage to provide a lower-bound estimate of the steady-state water supply to the city. The design of a self-cleaning, continuous flow urban wastewater system implies that Greek city planners maintained a high level of awareness about the hygienic conditions needed to maintain the health of the populace. The Greek attitude toward technical refinements necessary to improve the quality of urban life could therefore not be better represented than in attention to detail related to water supply and waste water drainage systems as a key to improved life standards.     

City, region, and in between: New York City's water supply and the insights of regional history

Urban historians have greatly expanded their geographical purview in recent years, incorporating suburbs and hinterlands into their analysis of social and environmental change. Urban environmental historians and suburban historians have played a critical role in the regionalization of urban history over the last decade. This case study of the development of New York City’s water supply reveals the benefits of taking a regional approach to urban history. From the New York Public Library to Central Park’s Great Lawn to neighborhood parks, the New York City landscape bears the traces of the continuous development of the city’s water network. Expansion of the water system in rural hinterlands enabled municipal officials to put urban reservoirs to new uses, creating some of the city’s most beloved public spaces. The rehabilitation of urban infrastructure underscores the intimate linkages between rural development and the urban built environment.     

Site preservation at Gordian,an Iron Age city in Anatolia

Abstract

Since excavations began at the Citadel Mound of Gordion in the 1950s, the site has been exposed to the extreme weather conditions of Central Anatolia. The architectural remains, including a unique palace quarter and citadel, are deteriorating to the extent that the legibility of the site is threatened.

The excavated area within the mound, comprising more than two hectares, is too vast to be covered by protective sheltering given the current budget. Conventional backfilling is also precluded, as this would obscure key topographical elements of the site and distort the stratigraphical context of the city within its surrounding citadel.

To preserve the site under these conditions, a technique of sandbag buttressing and clay capping has been implemented at Gordion. Using locally available materials, this system of interpretive stabilization not only preserves the architecture of the ancient city within its stratigraphical context, but improves the legibility of the site as a whole.     

Energy efficiency left behind? Policy assemblages in Sweden’s most climate-smart city

ABSTRACT

Smart city experiments have the potential to reshape urban climate change governance. Smart city initiatives have been supported by international technology companies and the European Union for many years and continue to be promoted by national and municipal governments. In relation to sustainability and climate change, such initiatives promise more efficient use of resources through the use of information and communications technology in energy infrastructure. Experiments with smart city technologies such as urban smart grids have shown the potential to restructure relationships between energy utilities, energy users and other actors by reconfiguring the dynamics of energy supply and demand. But do urban experiments lead to institutional change? The aim of the article is to provide a better understanding of how smart city experiments reshape the urban governance of building energy use. Hyllie, a new city district in Malmö, Sweden, was home to two smart city experiments that contributed to the institutionalization of urban smart grid technology. However, the analysis of Hyllie’s policy assemblages shows that this institutional change could redefine sustainability at the expense of energy efficiency.     

从考古发现看先秦时期城市的给水与排水

先秦时期城市的给水主要来源有两个,一是凿井取水,二是穿渠引水。井水水质纯净,渠水水量较大。城市的排水主要依靠管道将城中的雨水和生活废水排往城外的护城河中。     

The Water Balance of the World's Continents and a Balance Estimate of the World's Freshwater Resources

The results of several years of investigation of the water balance of continents and the world's freshwater resources are presented. Through the use of interpolation relationships to make up for data gaps, maps are compiled for the basic elements of the water balance of the world: total runoff, including its surface and subsurface components, evaporation, gross wetness (soil moisture) and the coefficient of subsurface alimentation of streams, which reflects much of the stable component of streamflow. Revised estimates for the water-balance elements are offered for continents on the basis of revised data. The per capita water supply of continents is calculated, with separate listing of the stable component of runoff, consisting not only of the subsurface flow to streams but also the portion of surface streamflow that is regulated through lakes and reservoirs.     

秦雍城豆腐村制陶作坊遗址发掘简报

秦雍城遗址位于陕西省凤翔县城以南,东距西安市170公里,西南距宝鸡市50公里。据文献记载,从春秋晚期的德公元年(前677年)至战国中期的献公二年(前383年)的294年间,雍城一直作为秦国都城,成为秦人由西向东逐渐迁徙     

Revealing the city in maps: Bath seen, built, and imagined

Putting Bath on the Map is an exhibition of maps of the City of Bath displayed in the Building of Bath Collection. The maps are considered in the context of the permanent collection of the museum which examines how buildings were constructed in the eighteenth-century city. The exhibition reviews how buildings moved from conception, as shown on maps and in architectural texts, through legal, financial, and material processes to take their place in the landscape. This essay considers the display of particular maps, such as Joseph Gilmore's (1694), and John Wood's (1735), and the recent city initiative to improve its signage maps to help visitors and citizens build mental maps of the historic city.     

Prousa/Bursa,a city within the city: chorography,conversion and choreography

Abstract

Narratives on the birth of the Ottoman city of Bursa, the first capital of the Ottomans, known to the Byzantines as Prousa, highlight its early Ottoman identity. Although Bursa represents one of the richest legacies of early Ottoman architecture, the city's urban fabric has suffered from several fires and earthquakes that resulted in heavy restorations and remodellings. The first aim of this paper is to discuss the textual and visual evidence for the built environment in the early fourteenth century and, second, to offer commentary on the Ottoman attitude toward Byzantine architecture in an effort to unearth the Byzantine substrata of Ottoman Bursa. In the service of the latter goal, this article debunks the Ottoman-centric views. With the aid of drawings of Bursa's upper city that predate the 1855 earthquake we may begin to visualize a city far less uniform in character, in which the Byzantine legacy both endured and informed the construction and urban design practices of the ascendant Ottomans.     

Optically stimulated luminescence dating of the city wall system of ancient Tayma (NW Saudi Arabia)

In addition to a series of chronological markers (artefacts, pottery) in the archaeological contexts of ancient Tayma (NW Saudi Arabia), optically stimulated luminescence (OSL) and radiocarbon dating techniques were applied to generate reliable ages for the city wall system of the oasis. A massive aeolian sand deposit burying the oldest part of the outer wall of Tayma was sampled to obtain a minimum age for the construction of this wall. The sequence of OSL ages from the inactive dune (ID) (4900 ± 300 a, 5100 ± 400 a, 4400 ± 300 a, 3900 ± 200 a, 4000 ± 200 a) is in full accordance with ¹⁴C-AMS ages of charcoal embedded into the same dune (4190–4420 cal BP, 3870–4080 cal BP). Underlying alluvial samples from the inactive gravel sheet (IGS) in contrast give maximum ages for the construction which scatter between 6600 ± 300 a and 4900 ± 400 a. The new dating sequence provides evidence that the oldest part of the ancient city wall system already existed in the 2nd half of the 3rd mill. BC which is earlier than expected thus far from archaeological and architectural interpretation.     

An ethnographic exploration of food and the city

This article describes an ethnographic exploration of the food system that feeds the majority of the over 4.6 million residents of the fast‐growing city of Dar es Salaam, along with the key findings of this research. Such a study is important in the context of an increasingly unsustainable corporate food system that many in more affluent countries are beginning to assume is essential for feeding the world's growing and urbanizing population. Following key foods from urban eaters back to primary producers reveals a symbiotic food system made up of a multiplicity of small‐scale actors who together deliver on a city‐wide scale.     

郑韩故城出土青铜器的矿料来源初步分析

基于富集在铜料中而保留其母矿信息的元素可以用于示踪青铜器的矿料来源,为了解郑韩故城青铜器的矿料来源,利用ICP-AES方法对郑韩故城出土东周时期青铜器的微量元素进行了检测。结果显示,21个青铜器样品微量元素特征具有相对一致性,推测可能具有相同的原料来源。与小双桥遗址出土青铜器的微量元素特征进行对比,二者存在明显的差异,说明从商代中期到春秋战国时期,这一地区的原料来源发生了改变。研究结果可为研究东周时期这一地区铜业发展状况提供线索。     

Shifting meanings in changing contexts: the role of the creative city in Shanghai,Hong Kong and Taipei

Abstract

This paper probes the underlying motives behind the adoption of the ‘creative city’ policies in Shanghai, Hong Kong and Taipei. It argues that while the global appeal of the creative city is commonly attributed to urban entrepreneurialism, this reason alone is insufficient in explaining the so-called ‘cultural turn’ in these three cities, because none of them ascribe to the conventional format of the post-industrial ‘entrepreneurial’ city. In order to identify other major forces driving the adoption of creative city initiatives in Shanghai, Hong Kong and Taipei, this work delves into the ways in which the idea of the creative city is reworked within the context of global city making. The study found that in addition to urban entrepreneurialism, the inherited cultural policy agenda, which largely stems from national interests, also plays a significant role in directing (and changing) the ‘global cultural city’ making process. By looking into different roles attached to the ‘imported’ policy discourse of the creative city in Shanghai, Hong Kong and Taipei, this study not only contributes to the understanding of urban cultural policies within the Chinese-speaking world and East Asia more generally, but also lends some insights to the developing field of cultural policy mobility.     

元大都内部河湖水系的空间分布特点

元大都内部的河湖水系基本上归为两大系统:一是以白浮泉为源头的高粱河-积水潭水系,一是以玉泉山泉水为源头的金水河-太液池水系。两套水系在城市中发挥了不同的功能,并与元大都的礼制原则相融合,共同构成了这座独具特色的东方山水城市。本文在侯仁之的工作基础上,对元大都内部的河湖水系做了进一步的系统研究,较为准确地复原了元大都城内积水潭水系的结构和分布范围;根据各种历史文献记载、结合地形分析,对金水河的位置和走向提出了新的见解,并对元大都水系结构与城市形态的关系进行了探讨。     

Water for the City,Ruins for the Country: Archaeology of the New York City Watershed

Two New York City institutions, the Board of Water Supply (BWS) and Department of Environmental Protection (DEP), have shaped rural regions far outside city boundaries. The BWS depopulated places selected for reservoir construction. Residents were evicted and towns were demolished then submerged. Those who remained struggled to reorganize their lives amid the landscape clearance. Once the reservoirs were complete, the DEP replaced the BWS as the institution in charge of ensuring the city’s water supply. The DEP Police patrols around the reservoirs and enforces land-use regulations. Archaeological survey of city-owned watershed lands reveals a scarred landscape of ongoing colonial conflict.     

One city,different views: a comparative study of three pilgrimage maps of Jerusalem

Among the early printed maps of Jerusalem there is a special group of realistic maps, which should be identified as pilgrimage maps. They were based on an actual acquaintance with the city, and drawn by pilgrims or for them. These maps depicted Jerusalem as the Holy City for Christianity; portraying the city through the eyes of the Christian pilgrims, and reflecting their perceptions, excitement and devotion. They often underscored the city's religious sites and traditions, and undermined certain elements of the city's actual cultural and religious landscape.     

Flags in the city. The case of Gdynia

Abstract

The article discusses flags in respect of their different forms (kind or type of occurrence) and functions served (role and meaning). The author raised the following research questions about the current use of flags in the city: when, what flags and why they are flown along the city streets? The following thesis was put forward that flags hung by Gdynia City Hall are a reflection of its development policy. The paper is based on data obtained from the City Hall of the Baltic city of Gdynia (Poland) and semi-structured interviews conducted in September 2015 with two clerks responsible for flag display in the city. The distribution of flags along the streets in Gdynia varies in time and in space. The ancient invention which is the flag is currently used in Gdynia in two forms (traditional flags and promotional banners) and it fulfils two functions: signalisation and identification. Flags have become a visual sign of the eventification and festivalisation of urban politics and, at the same time, of the public space of Gdynia.     

Children's perception of their city centre: a qualitative GIS methodological investigation in a Dutch city

Children represent a population group that is much neglected in the city planning process. Their perceptions, which are different from those of adults, are usually not incorporated in the design of cities. The aim of this paper is to present a qualitative GIS approach to capture children's perceptions of the urban environment. It gives a detailed insight into why certain perceptions occur and what the associated physical and social qualities are. The approach considers children as active participants and combines quantitative and qualitative methods. Twenty-eight children aged 10–17 were involved in examining the city-centre area of Enschede, the Netherlands. The results show both similarity and heterogeneity in perception (e.g. based on gender and age group) and the emergence of new location-specific qualities (e.g. natural elements, smart technologies, economic functions). It concludes with a discussion on the potential of incorporating this approach in urban planning processes.     

Hydrogeology of the Krafla geothermal system,northeast Iceland

The Krafla geothermal system is located in Iceland's northeastern neovolcanic zone, within the Krafla central volcanic complex. Geothermal fluids are superheated steam closest to the magma heat source, two‐phase at higher depths, and sub‐boiling at the shallowest depths. Hydrogen isotope ratios of geothermal fluids range from ?87‰, equivalent to local meteoric water, to ?94‰. These fluids are enriched in ¹⁸O relative to the global meteoric line by +0.5–3.2‰. Calculated vapor fractions of the fluids are 0.0–0.5 wt% (~0–16% by volume) in the northwestern portion of the geothermal system and increase towards the southeast, up to 5.4 wt% (~57% by volume). Hydrothermal epidote sampled from 900 to 2500 m depth has δD values from ?127 to ?108‰, and δ¹⁸O from ?13.0 to ?9.6‰. Fluids in equilibrium with epidote have isotope compositions similar to those calculated for the vapor phase of two‐phase aquifer fluids. We interpret the large range in δD_EPIDOTE and δ¹⁸O_EPIDOTE across the system and within individual wells (up to 7‰ and 3.3‰, respectively) to result from variable mixing of shallow sub‐boiling groundwater with condensates of vapor rising from a deeper two‐phase reservoir. The data suggest that meteoric waters derived from a single source in the northwest are separated into the shallow sub‐boiling reservoir, and deeper two‐phase reservoir. Interaction between these reservoirs occurs by channelized vertical flow of vapor along fractures, and input of magmatic volatiles further alters fluid chemistry in some wells. Isotopic compositions of hydrothermal epidote reflect local equilibrium with fluids formed by mixtures of shallow water, deep vapor condensates, and magmatic volatiles, whose ionic strength is subsequently derived from dissolution of basalt host rock. This study illustrates the benefits of combining phase segregation effects in two‐phase systems during analysis of wellhead fluid data with stable isotope values of hydrous alteration minerals when evaluating the complex hydrogeology of volcano‐hosted geothermal systems.     

武汉都市圈经济社会要素流的空间分析

都市圈城际经济联系与相互作用空间表现形式为城市间、城市-区域间的人流、物流、信息流、资金流、技术流等经济社会要素流。基于城际功能集散效应影响量建立城市流模型:F=NE,揭示出:武汉都市圈各中心城市经济社会要素流强度空间差异明显,对外经济联系呈现显著规模等级分布,空间结构上已经形成以武汉为中心的"鞍形"圈层结构。通过统计数据,利用SPSS统计软件,从实证角度分析得出:武汉成为圈域经济社会要素流集散中心,城际经济社会要素流不同程度表现出以武汉为中心的"等级放射状"空间格局。