Monitoring the 1997 flood in the Red River Valley using hydrologic regimes and RADARSAT imagery

In this study, we attempt to relate hydrologic regimes of the 1997 flood in the Red River Valley to the areal extent of flooding, determined from RADARSAT imagery. We obtained ten scenes of RADARSAT imagery, from 27 April to 1 July, including bitmaps delineating flooded areas for each date, from the Manitoba Centre of Remote Sensing. These images were co-registered using an image-to-image registration process. By overlaying these flood maps in chronological order, we compared the areal extent of flooding with the hydrologic regimes of the Red River, expressed as relative depths of flooding above the bankful stage at selected gauging stations. The results of the study indicated that the area of flooding on 4 May (1,984 km ² ) corresponded well with the highest flood levels at several gauging stations. A previous scene on 27 April showed a larger area under water, but visual inspection of the processed imagery indicated a lack of conformity between flood level regimes and the areal extent of flooding on this date due to surface detention of pre-flood storm runoff. Thus, the RADARSAT imagery represented the flood regimes adequately only when its interpretations were combined with hydrologic analysis and visual inspection of surface characteristics of the floodplain.     

Flood risk mapping in southwestern Nova Scotia: Perceptions and concerns

Flood risk mapping allows for informed decision making regarding personal and community planning. Resistance to flood risk mapping can be driven by potential decline of property values. This paper explores resistance to flood risk mapping through the lens of climax thinking. Climax thinking is a novel theory guiding explorations of resistance to proposed land use changes. The aim of this study was to understand flood experiences, the presence of resistance to flood risk mapping, and whether climax thinking could help explain this resistance. To address this, surveys were administered to residents in the Nova Scotian towns of Liverpool and Bridgewater. We found that one third of respondents have experienced flooding, yet the majority have not seen a flood risk map, nor were they concerned about the potential impacts of flooding. Only one sixth of respondents exhibited resistance to flood risk mapping because of potential loss to property value. Dimensions of climax thinking were predictive of this resistance, specifically ignorance of an individual's own ability to adapt and inability to recognize the impact of their adaptation decisions on others, which together quadrupled the predictive power of the ordinal regression model. These insights can be applied to support the acceptance of flood risk mapping.     

Ecohydrology and Environmental Change to Lake Albacutya and Wyperfeld Park in North‐Western Victoria,Australia

Lake Albacutya is a well‐known intermittent lake in north‐western Victoria. The lake is near the termination of the Wimmera River. From time‐to‐time the lake fills and flow passes down Outlet Creek into Wyperfeld National Park. The wetlands associated with the lake have a high biodiversity value and are named in international treaties. This paper examines the hydrologic factors associated with lake filling and flow into Wyperfeld. The lake has filled approximately six times since 1880 and has partially filled on other occasions. Examination of rainfall data from 1875 at Horsham gave no indication of long term rainfall decline, and showed that rainfall at Horsham can be viewed as representative of rainfall in the Wimmera River catchment. However a double‐mass analysis showed that the relationship between the Wimmera River flow and rainfall has varied from 1890 to the present. Examination of data associated with six fillings of Lake Albacutya suggested that filling is a two‐year event requiring at least 550 GL of flow passing Horsham over the two years immediately associated with the flood. A simple model based on rainfall and this threshold reproduced observed characteristics of the data reasonably well. This suggested that the flooding frequency of Lake Albacutya has dropped from about one in 25 years in the natural state to a substantially lower frequency under current river conditions. The results also suggested that because of changes in the Wimmera River the last filling and flood into Wyperfeld in 1976 was far smaller than it would otherwise have been. This is consistent with field mapping of the flood in relation to River Red Gum (Eucalyptus camaldulensis Dehnh.) stands. Analysis of the health of these stands showed major dieback with the severity of this being roughly proportional to the distance from the 1976 flood boundaries. An examination of values associated with the lake and adjoining Wyperfeld National Park suggested that biodiversity and economic values are and will be compromised by the reduction in flooding. In particular, an internationally‐known provenance of Red Gum is at risk, and bird‐breeding opportunities have diminished.     

明清时期山西的城市洪灾及其防治

明清时期山西的城市洪灾普遍而严重,曾遭受洪水冲击的城市达到62座。地方社会的防治措施大致可以归纳为“拦”、“疏”、“蓄”三类。具体而言,“拦”,即在城郊修筑拦洪堤堰以障水,这是明清山西城市防洪的主要措施,其中某些城市堤堰的筑造技术值得关注;“疏”,即通过开凿水口、疏浚城壕及新凿河渠等手段,使洪水远离城区;“蓄”,就是在城内利用既有低洼之地或新凿陂池,以蓄积雨洪。以上举措并未能彻底改变山西城市洪灾普遍且严重的状况,探究起来,城市的地理坐落、生态环境破坏导致的水土流失、城市建成区的扩展等,是不容忽视的三大诱发因素。     

基于女性主义视角的城市住房与住区问题初探--以南京市为例

当代中国城市社会日益复杂和多元化,在以人为本和社会公平的社会思潮背景下,地理学界和规划界有必要深入关注女性这一重要亚群体单元。本文在简要引入西方女性主义地理学以及其关于城市住区发展理念的基础上,通过对南京的实证调查,从女性的角度分析了国内住房供给以及住区规划建设中存在的若干问题,揭示女性需求、性别差异在住区规划和建设中被忽视的现实,并对今后住区建设提出一些基于性别差异和维护男女平等原则的规划设想。     

Developments in flood maps for flood risk management in Scotland

ABSTRACT

Sustainable flood risk management in Scotland is underpinned by the Flood Risk Management (Scotland) Act 2009. Effective delivery of actions to reduce the adverse impact of flooding are dependent on a collaborative approach by Responsible Authorities and a common understanding of flood hazard and risk. Over the last few decades, flood hazard maps have established a prominent role as essential tools in supporting effective flood risk management. They have developed as a result of improved national datasets and advances in computer processing. Improvements in modelling confidence and in the spatial representation of hazard and risk-inform confident actions set out in Flood Risk Management Strategies that coordinate actions supporting adaptation to future hazard conditions. The continued development of the accurate spatial representation of flood hazard and risk is an essential component of enhancing resilience in the face of future climate change.     

建立农村居民健康档案刍议

为农村居民建立健康档案工作在我国处于起步阶段,根据农村居民健康档案的特点,规范健康档案的管理和有效利用,实现对农民健康的动态和连续管理,发挥健康档案对农村居民健康管理的作用,意义重大。     

Natural and unnatural complexities: flood control along Manitoba's Assiniboine River

Flooding and flood control long have been topics of concern for geographers and historians of North America, from Gilbert White's foundational work to attempts to understand the recent disaster in New Orleans. This paper considers the problem of flood control along the Assiniboine River in the province of Manitoba, Canada. The first section addresses the local landscape and the larger context, explaining changes in the relevant human and physical geography. The second section examines efforts to mitigate flooding, focusing on how the risk of inundation was shifted in location (not eliminated altogether) and compounded through time (not progressively resolved). The third focuses on a further source of complexity: the contested character of government jurisdiction. This final section also addresses major mid twentieth century changes in mitigation efforts: in the light of flooding on an unprecedented scale, governments became more open to compromise and more willing to undertake substantial projects. Gilbert White asserted that while floods are natural occurrences, flood damages are the responsibility of humanity. The question of responsibility might seem relatively clear in relation to flood mitigation, given that dykes are human constructions. The history of flood mitigation along the Assiniboine would suggest, however, that assigning responsibility for the failures and successes of flood mitigation is not so straightforward.     

Unsafe drinking water quality in remote Western Australian Aboriginal communities

Chronic kidney disease (CKD) is important in the fields of public health and health geography because of its heavy burden on the health system and high cost of treatment in its advanced stages. The causes of CKD are associated with diabetes and hypertension, but in some parts of the world, the disease occurs in the absence of these factors. Researchers identify this condition as CKD of “unknown” causes (CKDu). CKDu is a multi‐factored health problem and one suspected causal factor is contaminated drinking water. The disease occurs globally but is found in particularly high concentrations among people of certain ethnic and disadvantaged social groups living in very different locations around the world. CKD has become endemic in Western Australia where hospital admissions for Aboriginal people requiring renal dialysis or treatment for diabetes are much higher than for the general population. The possible proportions of CKDu cases among the CKD patients are unknown. This study examines the drinking water quality among communities such as these. Water chemistry analysis in these areas indicates that the nitrate and uranium content greatly exceed officially recommended levels. Most of these communities rely on raw groundwater to supply their domestic needs, and it is very likely that the people are unwittingly ingesting high levels of nitrates and uranium, probably including uranyl nitrates. Very few such remote communities have access to treated drinking water, and cost‐effective water treatment systems are required to provide potable water at the local scale.     

中国城市女性居民行为空间研究的女性主义视角

在以人为本、重视差异性等后现代思潮的大背景下,基于女性主义视角的西方城市女性居民行为空间的研究有了长足的发展。中国城市中的女性群体,作为城市社会中的一个重要亚群体单元,在改革开放后经历着重大变化的同时也面临着新的挑战,对中国城市女性居民行为空间的女性主义研究已悄然起步,今后的研究视角不仅要关注女性自身的特点及其与男性的对比,而且更要重视女性内部的差异性以及城市内部和城市之间的比较。     

Storm Drains as Assemblages: The Political Ecology of Flood Risk in Post‐Colonial Bangalore

Cities around the world are increasingly prone to unequal flood risk. In this paper, I “materialize” the political ecology of urban flood risk by casting stormwater drains—a key artifact implicated in flooding—as recombinant socionatural assemblages. I examine the production of flood risk in the city of Bangalore, India, focusing on the city's informal outskirts where wetlands and circulations of global capital intermingle. Staging a conversation between Marxian and Deleuzian positions, I argue, first, that the dialectics of “flow” and “fixity” are useful in historicizing the relational politics of storm drains from the colonial to the neoliberal era. Second, flood risk has been heightened in the contemporary moment because of an intensified alignment between the flow/fixity of capital and storm drains. Storm drains—and the larger wetlands that they traverse—possess a force‐giving materiality that fuels urban capitalism's risky “becoming‐being”. This argument raises the need for supplementing political‐economic critiques of the city with sociomaterialist understandings of capitalism and risk in the post‐colonial city. The paper concludes with reflections on how assemblage thinking opens up a more distributed notion of agency and a more relational urban political ecology.     

Household economic resilience to catastrophic rainstorms and flooding in a Chinese megacity

Megacities situated on flood plains face escalating risks of waterlogging and inundation. Tianjin is one of these megacities in China where residents are exposed to these risks and not well prepared for their consequences. Government policies should support the most vulnerable and less resilient groups. This study can inform policy‐making by identifying the socio‐economic characteristics of those who are financially better prepared for the consequences of catastrophic rainstorms and flooding. A structured questionnaire survey was administered to 332 Tianjin residents. Results confirm that financial conditions crucially determine household resilience to these natural hazards. Lower‐income and less educated urban residents have lower resilient capacity. Weak engagement in the community, including residential committees and other organisations, is related to lower capacity to cope with the economic consequences of extreme weather events. Less resilient groups are therefore those who are subject to urban poverty and have limited social capital. Tianjin and other cities in the developing world require resilience strategies that attend to this segment of urban population.     

地方社会与国家的跨地方互补——光绪十三年黄河郑州决口与晚清义赈的新发展

光绪十三年(1887年)黄河在郑州决口,是铜瓦厢改道后最大的一次黄河水灾。对于此次水灾期间的赈灾事务,学界以往甚少注意。实际上,此时以江南绅商为主体的民间力量自发组织动员的义赈活动,不仅承担了此次赈务中的很大一部分工作,而且是整个晚清义赈机制发展到一个新阶段的标志,其实践逻辑甚至还可以帮助我们推进此前关于地方史研究取向中国家与社会的关系的反思。     

Does it matter where I live?

"The traditional view of the overall health field is criticized and a new perspective embracing the environment, life style, human biology and health care is presented. Spatial variations and distributional patterns in the UK of premature death from coronary artery disease in males and females, lung-bronchus cancer in males, cancer of the female breast, and 'All Causes' for both sexes are described and analysed at national, regional, district and intra-urban scale. High risk and low risk areas/communities for premature death from selected diseases are listed as indicators of local health status."     

居民对城市社区内非赌场类博彩的感知差异——以香港为例

香港的非赌场类博彩发展成熟,是研究此类博彩产业的良好案例。本研究采取问卷调查的方式,收集可供分析的603份问卷,采用单因子方差分析(one way ANOVA)等统计手段,得出以下研究结论:香港居民对于博彩业发展的态度不算积极;居民由于性别、年龄、受教育程度和职业的不同,出现对于博彩业态度与感知的差异。男性、老年人、受教育程度较高的人、中产阶级更加支持博彩发展或者更多的感知到其带来的正面影响,主要在于他们从中得到了更多的利益。本研究为香港政府进一步规划和管制非赌博类博彩业发展提供参考依据。     

LOCAL AMENITIES AND RENTS: TIEBOUT TAKES A VACATION*[link]

ABSTRACT This paper considers a two‐community model with free mobility, public expenditures set by majority voting, amenities that differ across communities, and two types of taxpayers sorting across communities according to different preferences. Residents pay local taxes, consume public services, and have the right to vote. Vacationers cannot vote, yet pay local taxes, and consume amenities. Amenities attract vacationers whose tax payments produce rents reducing the costs of public spending for permanent residents. These extractable rents produce stability in otherwise unstable equilibria. Relatively wealthy communities are generally less able than poor communities to extract rents.     

城市设施环境对初中学生体质健康的影响——以大连市主城区为例

青少年学生体质下降,身体形态肥胖化。论文以BMI指数衡量学生体质健康,通过地理加权回归模型分析了校内、通学以及社区服务设施对初中学生体质健康的异质性影响。发现:(1)初中学生体质健康社区分异明显,超重低风险和未超重高风险社区围绕超重高风险社区集聚。(2)能量摄入型设施分布从中心向边缘逐渐减少,能量消耗型设施表现出相反的特征,道路网密度向中心集聚,医疗设施呈离散分布。(3)学校人均绿地面积,通学距离、道路网密度,公交站、西餐厅、休憩设施、零售设施、医疗设施可达性对学生体质健康的影响在中心区与边缘区具有异质性。     

Why do people stay in or leave Fukushima?

From the originally constructed survey data from 2011 Fukushima incident, this paper empirically assessed the sources of failures in disaster risk mitigation in short run. Although residential relocation from the cites at risk is one of the effective risk reduction measures, the relocation incurs mobility costs of developing social capital such as communities or searching public services such as education and medical institutions. The estimation results showed that the residents in the disaster cites of 2011 Fukushima incident can tolerate higher risks of radiation exposure when they have attachment to the original residence or higher demands for the public services, and can stay in the cites at risks consequently. Because the tolerance level can depend on the information associated with the risks, the results imply that the authorities’ providing the correct information is one of the keys for the disaster risk reduction in short run.     

Assessment of Riparian Revegetation Trials on In-Channel Benches in the Hunter Valley of Southeast Australia

Large-scale river training works have been carried out in the Hunter valley since 1955 in response to flood-driven channel changes. Vegetation was planted on in-channel benches induced by river training works to consolidate the deposits and to increase channel boundary roughness. Exotic species of vegetation such as willows and poplars were previously used. In 1983, ten trial sites were planted with various species of native vegetation. Survival rates were evaluated in 1987 and 1997. The most successful species planted was Eucalyptus camaldulensis with an overall survival rate of 77 per cent in 1997. The Acacia species were found to be short-lived, exhibiting a significant decline in survival rates between 1987 and 1997. Survival rates for most species were higher on sand-bed than on gravel-bed sites. This difference may be attributed to better drainage on benches at the sand-bed sites. Investigations of flood disturbance showed that between 1983 and 1997 the sites were flooded between four and 13 times. The survival rates of Grevillea robusta and Eucalyptus melliodora trees were negatively correlated with the total number of recorded floods at each site. Poor natural regeneration of planted species is attributed to a combination of periodic flooding, intensive weed growth, low light intensities at ground level and grazing disturbance. These trials were not well designed for statistical analysis but provide valuable long-term information on the suitability of various species for planting in riparian rehabilitation programs. Such information is of relevance not only to river and catchment management authorities, but also to community groups.     

银川城市生活需求的性别差异及规划建议——基于女性主义视角的研究

本文在引入西方女性主义地理学以及城市居民行为空间和生活需求研究的基础上,以银川市为案例,实地调研和问卷调查分析了当今城市社区生活需求的性别差异,对中国两性居民在城市中的生存状态及其对满足生活需求的基础设施的评价,总结居民生活需求的性别差异特征。文章充实了国内关于生活需求性别研究的实证研究,指出性别差异在城市社区规划和建设中被忽视和女性通常处于弱势地位的现实,提出今后城市建设需重视公共交通和步行交通的规划,强调公共设施的人性化和多元化,加大社区服务力度,提高女性居民的社区参与度。