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Superficial deposits (residual, colluvial, alluvial) are important as environmental resources in tropical environments. An understanding of their formation through varying time periods is essential to a correct interpretation of their economic and hazard potentials. This requires an integration of process studies with a reconstruction of longer term development. Saprolite formation is considered over 105‐107 yr, while colluvial and alluvial sediments are commonly Late Quaternary (103‐105 yr) in age. The importance of Quaternary environmental changes in the humid tropics to an understanding of heavy mineral placer deposits in West Africa and Indonesia is illustrated. It is concluded that geomorphologists can often make their most important contributions to developing areas by offering a sound interpretation of landsurfaces and their underlying deposits for engineers, geologists and pedologists, with whom a close working relationship is essential.  相似文献   
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River courses migrate, but many Egyptologists plot the present-day River Nile on maps of the valley in archaeological times. This may have misled interpretations of ancient monuments and settlements. We show a river migrating rapidly on historical timescales in the Luxor region, sweeping > 5 km across the valley at rates on the order of 2–3 km per 1000 years. Satellite elevation data (SRTM), processed by a novel method, and Landsat imagery are used to trace ancient river levees and extend trends present in 200 years of archive maps thousands of years into the past. This supplements observations by Ptolemy (121–141 AD) and places local geo-archaeological studies in a wider spatial and temporal context. Satellite data are demonstrated to be a relatively quick and easy constraint upon ancient river courses, and a basis for investigations along the Egyptian Nile, even in logistically inaccessible regions.  相似文献   
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Angus Cameron 《对极》2006,38(2):236-258
This article argues that the geographies of taxation offer an important but neglected insight into changes taking place in the nature of the contemporary state in the context of globalisation. Following Schumpeter's analysis of the “tax state”, the paper argues that, historically, the theory and practice of fiscal space are fundamental both to state form and to the possibility of political and social institutions. Despite this, the complexity and fluidity inherent in fiscal space has been obscured by the dominant normative conception of “the” fiscal state. As the concept of “fiscal sovereignty” becomes less and less salient in practice in the context of economic globalisation, it remains a powerful ideological concept for state governance. This paper reviews the primary contemporary accounts of fiscal space across a range of disciplinary contexts and scales of governance. Despite the expectation and or desire for some form of “fiscal globalisation” on the part of commentators, in practice what we see is an increased centralisation of state fiscal control coupled with a creeping individuation and privatisation of fiscal responsibility. This radical respatialisation of fiscal space has profound implications both for the state itself and for any prospect of the creation of a global “public domain” founded on a global fisc.  相似文献   
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Radically new economic arrangements are needed for just and sustainable transitions to a more environmentally and ecologically resilient world. Yet little progress is being made to imagine the new economy-environment relations around which resources, actors, and ethics might be configured to enact the novel economic forms needed. This article uses a Social Studies of Economisation and Marketisation (SSEM) approach to examine a suite of differently scaled and structured environmentally focused economic development initiatives in New Zealand. We explore how the initiatives have assembled diverse actors and investment projects into experimental economy-environment relations. Our account highlights experimentation as a pivotal mode of economisation, and we argue that the initiatives studied by us expose a new experimentation-led agenda for transitioning to more environmentally and economically just futures. Working with the idea of experimentation in an SSEM framework, we also argue that the diverse initiatives are creating an experimentation infrastructure that provides a more generative platform for novel economy-environment relations than top–down models of change such as transition pathways. The article opens up a critical politics of environmental economy that focuses attention on emergence, agency, and practice and allows us to reimagine processes of transitioning.  相似文献   
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The small volcanic and limestone islands of the Lesser Antilles, in the eastern Caribbean, have a continuous history of commercial agricultural production which goes back 370 years. During this period, conditions of the environment, both natural (volcanoes, earthquakes, hurricanes, droughts) and human‐induced (deforestation, erosion, land degradation and reduction in the water‐table), have interfered with development in a variety of ways. The paper reviews past and present situations, and considers how growing sectoral imbalances may accentuate the resulting problems.  相似文献   
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