长江经济带交通基础设施空间均衡度研究

利用1997-2013年长江经济带各省份数据,研究了交通基础设施空间均衡和极化程度及其影响因素,并构建动态面板数据模型,采用系统GMM估计进行了实证检验。研究结果表明:长江经济带交通基础设施发展较快,但存在空间非均衡和空间极化特征;铁路密度和公路密度的空间非均衡程度依次递减,区域间差距是空间非均衡的主要原因;公路密度空间极化程度不断增加,且高于铁路密度的极化程度;财政支出、国际贸易、人力资源和新经济地理四大因素对交通基础设施空间均衡和极化具有影响,但影响效果不同。本文拓展了交通基础设施的研究,为长江经济带交通基础设施协调发展及互联互通战略顺利实施提供了政策依据。     

Chemical modification of pyroclastic rock by hot water: an experimental investigation of mass transport at the fluid–solid interface

Hydrothermal water–(pyroclastic) rock interactions were examined using flow-through experiments to deduce the effect of mass transport phenomena on the reaction process. A series of experiments were conducted over the temperature range 75–250°C, with a constant temperature for each experiment, and at saturated vapour pressure, to estimate the apparent rate constants as a function of temperature.
Based on the chemistry of analysed solutions, the water–rock interaction in the experiments was controlled by diffusion from the reaction surface and by the existence of a surface layer at the rock–fluid interface, which regulated the chemical reaction rate. The reaction progress depended to a high degree on flow velocity and temperature conditions, with element abundances in the fluid significantly affected by these factors. Mass transport coefficients for diffusion from the rock surface to the bulk solution have been estimated. Ca is selectively depleted under lower temperature conditions ( T  < 150°C), whereas Na is greatly depleted under higher temperature conditions ( T  > 150°C), and K reaction rates are increased when flow velocity increases. Using these conditions, specific alkali and alkali earth cations were selectively leached from mineral surfaces. The 'surface layer' comprised a 0.5–1.8 mm boundary film on the solution side (the thickness of this layer has no dependence on chemical character) and a reaction layer. The reaction layer was composed of a Si, Al-rich cation-leached layer, whose thickness was dependent on temperature, flow velocity and reaction length. The reaction layer varied in thickness from about 10⁻⁴ to 10⁻⁷ mm under high temperature/low fluid velocity and low temperature/high fluid velocity conditions, respectively.     

Gender and emergent water governance: comparative overview of neoliberalized natures and gender dimensions of privatization,devolution and marketization

This article provides a critical reading of some of the gendered dimensions of emergent water governance regimes, specifically those related to the privatization, marketization and devolution of water resources management. After first providing an overview of recent nature–society contributions related to neoliberalization processes, the article comparatively evaluates insights with respect to the gender dimensions of recent shifts in water governance. I make several arguments at the intersection of relevant literatures. First, there is a need for gender theorists interested in water resources and nature–society debates to engage more with issues, theories and processes associated with neoliberalization. Second, there is a need for more attention to gender, feminist theory and approaches to inequality and socio-spatial difference in discussions of neoliberalized natures. Third, reading these literatures together reveals that there is a need to be self-reflexive and critical of elements of the gender and water literature that implicitly endorse foundational elements of the neoliberal turn in resource governance. Finally, there are particularities with respect to gender theory and politics, and water materialities that hold importance for understanding recent water governance shifts in the broader context of political and economic changes associated with neoliberalization.     

潮湿土遗址隔水防潮技术对比研究

潮湿土遗址的破坏,很大程度上是受水的影响,目前国内几个潮湿土遗址经常使用的防水隔水措施主要有:挡水墙、隔水廊道、拱券法和抽水法。经过对几种方法进行总结评价,可看出拱券法是最有效的方法。     

Rainwater Tank Households: Water Savers or Water Users?

This paper provides the first published post‐installation analysis of retrofitted rainwater tanks and their effects on mains water consumption. The study aimed to determine the average mains water reductions achieved in households with recently installed rainwater tanks and compare this figure with wider community consumption. The social and cultural impacts of rainwater tank ownership were also explored to understand how rainwater is used and perceived. The results show that during the period of analysis, the drought years of 2005–2007, 7125 or 8% of Illawarra households installed a tank. Comparison of mains water consumption for two years before and after installation shows that rainwater tank households reduced their mains water consumption about the same amount (10.26%) as the wider community (10.8%). The social and cultural components reveal three main groups of households. The largest group, water users, had a desire for water autonomy and independence to continue previously enjoyed water practices that had been restricted. Among a light green group, tanks were part of a package of overtly pro‐environmental behaviours that did not necessarily change consumption patterns. A frugal group, many of whom had been raised in rural areas, were the main water savers. Perception of tank water quality was shown to be an influential determinant of how rainwater was used, particularly for connections internal to the house. This study shows that rainwater tanks have the potential to achieve significant water savings, but if water‐intensive behaviours are not modified, and rainwater tanks are not plumbed indoors, the potential of this alternative water source will not be met. Currently, rainwater tanks facilitate water users as much as water savers.     

Obsidian hydration dating by infrared spectroscopy: method and calibration

Low temperature (90–190 °C) hydrothermal experiments have been conducted on seven obsidians where composition of the glass varies significantly in the concentration of structural water within the unhydrated bulk material. Infrared transmission spectroscopy was used to track the diffusion of molecular water into the glass surface as a function of time and temperature. Long-term (60–360 days) hydration sequences at 90 °C show a t^0.6 time dependence for the mass uptake of molecular water that forms the hydration layer. The structural water concentration of the unhydrated bulk obsidian is highly correlated with the pre-exponential and activation energy and may be used to estimate the Arrhenius constants. In addition, secondary ion mass spectrometry (SIMS) hydrogen profiling of Napa Glass Mountain obsidian hydrated at 90 °C reveals that the early stages of diffusion exhibit a dynamic behavior that includes a fluctuating hydrogen concentration and a changing diffusion coefficient that slows with time.     

The Role of Cross‐Scale Institutional Linkages in Common Pool Resource Management: Assessing Interstate River Compacts*

This article extends the Institutional Analysis and Development Framework's seminal research on common pool resource (CPR) management in new directions by exploring how the design principles of robust and enduring CPR management, initially proposed by Elinor Ostrom in 1990, can be used to measure and assess cross‐scale institutional linkages. This study examines data from 14 interstate river basin compacts in the western United States to identify the types of linkages established in these interstate settings, the factors that contribute to the emergence of diverse types of linkages around these shared resources, and how different types of linkages perform. Using Ostrom's CPR design principles to operationalize and measure linkages, the study shows that diverse types of cross‐scale linkages were created under the 14 interstate compacts, with linkages related to monitoring found to be particularly prevalent. The types and diversity of linkages can largely be explained by the conditions under which compacts emerged and the water management issues states jointly face. In applying the evaluative criteria operationalized by the CPR design principles, this research further shows that the monitoring and collective choice linkages created by compacts tend to be of higher quality, while enforcement and conflict resolution linkages appeared to be of the lowest quality. In addition to developing the IAD literature on CPR management, these findings offer critical insights for assessing the capacity of interstate river basin compacts in the western United States to manage shared resources successfully, as well as insights for what types of institutional investments may be needed for enhanced resource governance.     

Photovoice Evaluated: An Appropriate Visual Methodology for Aboriginal Water Resource Research

Methodologies in human geography are rapidly evolving to include participatory approaches that incorporate other voices and knowledges. Central to these participatory methodologies is the co‐evolution of research objectives, the co‐production of knowledge, joint learning, and capacity building of all those involved. Visual methodologies that use the media of photography are gaining recognition as powerful participatory methods. In this paper, we evaluate whether photovoice is a culturally appropriate and engaging visual methodology, and consider how it can be improved to better facilitate research between non‐Aboriginal researchers and Aboriginal Australians involved in water resource management. We draw from two photovoice projects conducted in partnership with two separate Aboriginal groups in northern Australia. Photovoice methodology in this context was found to be both culturally appropriate and engaging. It facilitated genuine participatory research, empowered participants, and was easily adapted to the field situation. The methodology proved to be a powerful tool that revealed in‐depth information including Aboriginal values, knowledge, concerns, and aspirations for water resource management that may not have been captured through other participatory approaches. Photovoice methodology could be enhanced with a more defined role for the researcher as knowledge broker and as translator and communicator of research outcomes (as deemed appropriate by research participants) to policy makers.     

The 2012 acid mine drainage (AMD) crisis in Carolina's municipal water supply

ABSTRACT

There are growing concerns in South Africa about the threat that acid mine drainage (AMD) poses to local natural water resources in many of the country's mining areas. Since the beginning of the 21^st century, the toxic water has been responsible for pollution in parts of the country. Government and operators in the country's water sector have actively been working in recent years at addressing the problem. This article deals with a contemporary history of an AMD crisis in the coalmining town of Carolina, in the Mpumalanga Province of South Africa, and explains how the matter was eventually resolved. The discourse focuses on how people of Carolina responded to the contamination of the municipality's water supply system and eventually chose to follow the path of active protest. The water crisis even made a detour to the high court, with a number of non-governmental organisations (NGOs) actively supporting the cause of local residents. Although by September 2012 the town's water supply was restored, the community remained distrustful of the local authority's ability to secure a consistent supply of good quality water. The authorities took some measures to restore trust. People had been traumatised and sound relations had to be restored in the aftermath of the crisis. The Carolina crisis of 2012 is contemplated from the perspective of the current threat that AMD poses to South Africa's finite water resources and the danger of mining in sensitive areas.