Zhongyuan Chen

Bio: Zhongyuan Chen is an academic researcher from East China Normal University. The author has contributed to research in topics: Drainage basin & Materials science. The author has an hindex of 19, co-authored 39 publications receiving 1445 citations. Previous affiliations of Zhongyuan Chen include University of Naples Federico II & University of Melbourne.

Approaches to defining deltaic sustainability in the 21st century

Abstract: Deltas are among the most productive and economically important of global ecosystems but unfortunately they are also among the most threatened by human activities. Here we discuss deltas and human impact, several approaches to defining deltaic sustainability and present a ranking of sustainability. Delta sustainability must be considered within the context of global biophysical and socioeconomic constraints that include thermodynamic limitations, scale and embeddedness, and constraints at the level of the biosphere/geosphere. The development, functioning, and sustainability of deltas are the result of external and internal inputs of energy and materials, such as sediments and nutrients, that include delta lobe development, channel switching, crevasse formation, river floods, storms and associated waves and storm surges, and tides and other ocean currents. Modern deltas developed over the past several thousand years with relatively stable global mean sea level, predictable material inputs from drainage basins and the sea, and as extremely open systems. Human activity has changed these conditions to make deltas less sustainable, in that they are unable to persist through time structurally or functionally. Deltaic sustainability can be considered from geomorphic, ecological, and economic perspectives, with functional processes at these three levels being highly interactive. Changes in this functioning can lead to either enhanced or diminished sustainability, but most changes have been detrimental. There is a growing understanding that the trajectories of global environmental change and cost of energy will make achieving delta sustainability more challenging and limit options for management. Several delta types are identified in terms of sustainability including those in arid regions, those with high and low energy-intensive management systems, deltas below sea level, tropical deltas, and Arctic deltas. Representative deltas are ranked on a sustainability range. Success in sustainable delta management will depend on utilizing natural delta functioning and an ecological engineering approach.

Climate Change 2007: Impacts, Adaptation and Vulnerability.

Abstract: Impatti, adattamento e vulnerabilita Le cause e le responsabilita dei cambiamenti climatici sono state trattate sul numero di ottobre della rivista Cda. Approfondiamo l’argomento presentando il documento: “Cambiamenti climatici 2007: impatti, adattamento e vulnerabilita” votato ad aprile 2007 dal secondo gruppo di lavoro del Comitato Intergovernativo sui Cambiamenti Climatici (Intergovernmental Panel on Climate Change). Si tratta del secondo di tre documenti che compongono il quarto rapporto sui cambiamenti climatici.

The New Imperialism

Abstract: From a world history perspective, the most noticeable trend in the history of the late 19th century was the domination of Europeans over Non­Europeans. This domination took many forms ranging from economic penetration to outright annexation. No area of the globe, however remote from Europe, was free of European merchants, adventurers, explorers or western missionaries. Was colonialism good for either the imperialist or the peoples of the globe who found themselves subjects of one empire or another? A few decades ago, the answer would have been a resounding no. Now, in the wake of the collapse of the Soviet Union, the more or less widespread discrediting of Marxist and Leninist analysis, and the end of the Cold War, political scientists and historians seem willing to take a more positive look at Nineteenth Century Imperialism. One noted current historian, Niall Ferguson has argued that the British Empire probably accomplished more positive good for the world than the last generation of historians, poisoned by Marxism, could or would concede. Ferguson has argued that the British Empire was a \" liberal \" empire that upheld international law, kept the seas open and free, and ultimately benefited everyone by ensuring the free flow of trade. In other words, Ferguson would find little reason to contradict the young Winston Churchill's assertion that the aim of British imperialism was to: give peace to warring tribes, to administer justice where all was violence, to strike the chains off the slave, to draw the richness from the soil, to place the earliest seeds of commerce and learning, to increase in whole peoples their capacities for pleasure and diminish their chances of pain. It should come as no surprise that Ferguson regards the United States current position in the world as the natural successor to the British Empire and that the greatest danger the U.S. represents is that the world will not get enough American Imperialism because U.S. leaders often have short attention spans and tend to pull back troops when intervention becomes unpopular. It will be very interesting to check back into the debate on Imperialism about ten years from now and see how Niall Ferguson's point of view has fared! The other great school of thought about Imperialism is, of course, Marxist. For example, Marxist historians like E.J. Hobsbawm argue that if we look at the l9th century as a great competition for the world's wealth and …

River Discharge to the Coastal Ocean: A Global Synthesis

Abstract: Foreword 1. Introduction 2. Runoff, erosion and delivery to the coastal ocean 3. Temporal variations 4. Human impacts Appendices. Global River Database: Appendix A: North and Central America Appendix B: South America Appendix C: Europe Appendix D: Africa Appendix E: Eurasia Appendix F: Asia Appendix G: Oceania References Index.