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Natural and Cultural Histories of San'in Region

山阴地区的自然历史和文化历史

基本信息

批准号：
07409006
负责人：
TOKUOKA Takao
金额：
$ 19.46万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1998
项目状态：
已结题

项目摘要

The main objects of the research are sea-level changes and synthetic studies on geographical, cultural, and social environments of lagoons, especially in Lakes Nakaumi and Shinji. The detailed geographic developments were reconstructed on the basis of drilling, core sampling and echo-sounding surveys and sea-level changes since 10,000 y.B.P.were discussed. Many lowland archaeological sites around Lakes Nakaumi and Shinji were reexamined from the view point of the Holocene sea level changes. The activities of our ancestors have been newly recognized as multi-sided using of the lakes as fishery ground, fishery ports and transportation bases. The surrounding lowland areas had provided convenient conditions for human activities especially for rice cultivation. These had made possible the prosperity of Paleo-Izumo. The effects of sea-level rise due to global warming on coastal lagoon areas such as salinity increase, salt water intrusion into freshwater aquifers, were examined. The depositional environment during the Holocene climatic optimum have been established from geochemical study of the sediment cores of Lake Nakaumi. The results will offer basic information for projections of lagoonal environments in future glob warming.A long-term observation system for the study of Halocline behavior in coastal lagoons and estuaries has been developed. This system was successfully carried out in Lake Nakaumi and would contribute to control the movement of oxygen-free saline water in near future, The system was also successfully carried out at River Gonokawa in Shimane Prefecture, one of the most famous tidal rivers in Japan.The Lake Nakaumi Reclamation Project, which was started in 1963, and have been suspected, are discussed from the view point of environmental sciences, and a program for wise use and balanced ecosystem has been proposed.

研究的主要对象是海平面变化和对泻湖，特别是Nakaumi湖和Shji湖的地理、文化和社会环境的综合研究。在钻探、岩心取样和回声测深调查的基础上，重建了详细的地理发展，并讨论了10000年来的海平面变化。从全新世海平面变化的角度对中泉湖和新知湖周围的许多低地考古遗址进行了重新考察。我们的祖先的活动被新认识为多方面地利用湖泊作为渔场、渔港和交通基地。周边低洼地区为人类活动提供了便利条件，特别是水稻种植。这些使旧石器出云港的繁荣成为可能。研究了全球变暖导致的海平面上升对沿海泻湖地区的影响，如盐度上升、咸水侵入淡水含水层等。通过对那考密湖沉积岩芯的地球化学研究，建立了全新世气候最佳时期的沉积环境。这一结果将为未来全球变暖中的泻湖环境预测提供基本信息。为研究沿海泻湖和河口的盐跃层行为，已经建立了一个长期观测系统。该系统已在Nakaumi湖成功实施，并将有助于在不久的将来控制无氧咸水的流动，该系统还在日本最著名的感潮河流之一岛根县的Gonokawa河成功实施。从环境科学的角度对1963年启动的Nakaumi湖围垦项目进行了讨论，并提出了合理利用和平衡生态系统的方案。