Modeling fluid flow in a heterogeneous, fault-controlled hydrothermal system

Previous studies have shown that most hydrothermal systems discharging at the land surface are associated with faulting, and that the location, temperature and rate of discharge of these systems are controlled by the geometry and style of the controlling fault(s). Unfortunately, the transport of heat and fluid in fault-controlled hydrothermal systems is difficult to model realistically; although heterogeneity and anisotropy are assumed to place important controls on flow in faults, few data or observations are available to constrain the distribution of hydraulic properties within active faults. Here, analytical and numerical models are combined with geostatistical models of spatially varying hydraulic properties to model the flow of heat and fluid in the Borax Lake fault of south-east Oregon, USA. A geometric mean permeability within the fault of 7 × 10⁻¹⁴ m² with 2× vertical/horizontal anisotropy in correlation length scale is shown to give the closest match to field observations. Furthermore, the simulations demonstrate that continuity of flow paths is an important factor in reproducing the observed behavior. In addition to providing some insight into possible spatial distributions of hydraulic properties at the Borax Lake site, the study highlights one potential avenue for integrating field observations with simulation results in order to gain greater understanding of fluid flow in faults and fault-controlled hydrothermal and petroleum reservoirs.     

The rise of cultural landscapes

The new interest in cultural landscapes is forcing a reappraisal of concepts of countryside heritage. First the traditional split between cultural and natural values is challenged. Second, modern landscape studies emphasise the subjectivity of landscape assessment, and this is subverting the former tendency to aspire to objectivity in evaluation. The acceptance of ‘associative’ value in landscape is an indicator of this. Modern landscape studies also emphasise the interrelationships between processes and aspects of value, and this is encouraging specialists to communicate across disciplinary frontiers. The desire by ecologists in the mid‐1980s to have cultural landscapes inscribed on the World Heritage list caused a re‐assessment of the World Heritage Criteria, and an initiative by ICOMOS brought this process to a conclusion in 1992. However the reappraisal of concepts of countryside value imply that there are many other philosophical and practical matters still to be resolved.     

ARRIVAL OF COURTLY LOVE: MOVING IN THE EMOTIONAL SPACE

Courtly love appeared in twelfth‐century Europe as a dissent from the emotional regime established by the Gregorian Reform, by setting the lady, instead of God, as the object of worship. From a game‐theory perspective, courtly love and hedonism correspond to Nash equilibria, in contrast to Christian marriage, whose stability is threatened by sex‐as‐appetite on one side and devotion to God on the other, and whose maintenance depends on moral control. The Church developed fear and shame, which are counter‐emotions to desire‐as‐appetite. Courtly love restored the thrill of forbidden adventure. It also shared traits common to innovations in the natural world: it added complexity (by increasing costs, emphasizing courtship, self‐restraint, and extremes of suffering); it was made possible by the plasticity of mating relationships; it introduced a small disorder in the ordered regime of Christian marriage; it demanded an adaptive effort, requiring the man to face ever more perilous trials and the woman to appear ever more attractive. Though obtained as a small deviation from the existing emotional regime, it had thoroughgoing and long‐lasting consequences for social control and for the political power of the Church. It also deeply modified the dynamic of longing in ego's representation. By taking the temporal form of a capture, it contrasts with twelfth‐century Bengal, where love was characterized by maintenance in an indefinitely repeating worship, by the absence of a here‐now versus target‐later dualism. It also contrasts with eleventh‐century Heian Japan, where love was intermingled with the melancholy of an impossible return, which is the antithesis of the concept of capture.     

Contested Regulatory Practice and the Implementation of Food Policy: Exploring the Local and National Interface

There is growing geographical interest in the nature of the 'real' regulation of the food system. The food 'scares' of the late 1980s in the UK encouraged new legislation relating to food hygiene and safety. Its local implementation created tensions which were exacerbated by the legislative consequences of the Single European Market. In response, national-level regulatory adjustments followed, which introduced new codes of practice and techniques of hazard analysis for implementation at the local level. The result was a consolidation of a system of food regulation that can be applied differentially across the 'tiers' of retailing. This paper explores the regulatory contentions of the early 1990s in the food policy arena and the nature of food regulation at the local level. It advances our understanding of the 'construction' of food quality and safety within the UK. Moreover, we argue that its depiction of the dialectical response between policy formulation and implementation confirms the need for local, as well as national level, exploration of the nature of the contemporary state.     

Scale, causality, complexity and emergence: rethinking scale's ontological significance

Scale remains a pivotal yet highly contentious concept in geography. I survey the lively discussions engaged in recently by many critical/radical geographers regarding the theoretical status of scale. While these discussions have been intellectually fruitful, I argue that much more needs to be said. Drawing from complex systems theory, I argue that scale should be understood as an ontological category essential to understanding causality. Revalorising Aristotle's four categories of cause – formal, final, material and efficient – from two centuries of positivist thinking facilitates this endeavour. Research on the relationship between university-based poultry scientists and the poultry industry illustrates the explanatory potential of poly-scalar analysis.     

Hydrology of the combination irrigation system in the Wadi Faynan, Jordan

The field system of the Wadi Faynan in southern Jordan was fed by an ancient combination irrigation system that incorporated runoff farming and diversion irrigation techniques. The hydraulic characteristics of this system were most probably designed to take advantage of the confluence of three tributary streams. A theoretical model of discharge produced by runoff is based on contemporary ground conditions and historic climate reconstructions. The design principles of the main hydraulic features are examined and velocity and discharge measurements in principal conveyance irrigation channels are reconstructed. The design of this hydraulic system took into account the environmental constraints and opportunities of the area and maximized different sources of water in the catchment using various techniques of water collection.