A comprehensive field survey and analysis on a physical and ecological system of coral reef environment under adjacent land and ocean influence

邻近陆地和海洋影响下珊瑚礁环境物理生态系统综合实地调查与分析

基本信息

批准号：
12450198
负责人：
NADAOKA Kazuo
金额：
$ 9.6万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

1) Field observations using moored buoy systems with various logger-type sensors, GPS-installed small drifters and others were performed at Shiraho reef in Ishigaki Island in July to September 2000 and July in 2001to find characteristics of currents, waves, temperature salinity, turbidity, etc. The hydrodynamic feature, especially the mean flow field, in the reef are found to be governed by the spatial non-uniformity of the reef topography such as the S1ze and locations of the channels, shoals and reef edges.2) A smaller scale measurement to observe 3-D local current and temperature fields around coral communities was made also at Shiraho reef in the same period, revealing their characteristic features and the fact that corals may absorb light more effectively than coral sands.3) The watershed-based numerical model to simulate soil erosion and subsequent discharge into adjacent reef areas with input data such as precipitation, vegetation, soil type and topography has been developed and … More validated with the field data on time histories of turbidity at the Todoroki river taken continuously from June 2000.4) For examining the long-distance transport of coral larvae. which may be important in the restoration process of the heavily damaged coral reefs due to mass bleaching in 1998 summer a field measurement using an HF-ocean radar system, newly-developed GPS-installed drifters and others was performed to clarify the physical process of the sea-surface currents and the Lagrangian trajectories of tracers at the sea surface in the region connecting the Kerama Ms. and the west coast of the Okinawa Id. Besides larval behavior in the water column and settlement at the bottom were investigated in a laboratory. These results demonstrate that Kerama Isls. may act as a source area supplying appreciable amount of coral larvae to the west coast of Okinawa Isl.5) At Fukido and Miyara river moth areas in July and August 2001 a field observation was made to clarify the fundamental characteristics of physical environments of mangrove and sea-grass areas.6) With these field data, numerical models to simulate shallow water turbulent flows in the reef, which governs material and thermal transport in the reef, and coastal 3-D currents in a wide have been developed with the basis of SDS-Q3D model and POM-dual sigma coordinate model, respectively.7) As a basic theoretical tool for remote sensing of coral reef environments such as benthic cover, a 3-D optical model for coral canopy was developed. Less

1）在2000年7月至2001年9月在Ishigaki岛的Shiraho Reef进行了使用带有各种标志性传感器的系泊浮标系统，GPS安装的小型演练和其他观察的现场观察。在同一时期，在Shiraho Reef上也制作了一个较小的规模测量，以观察3-D局部电流和温度场，在同一时期内也进行了较小的尺度测量，以示观测到3-D的局部电流和温度领域，在同一时期内，较小的规模测量值也揭示了它们的特征特征，并且珊瑚可能会比珊瑚砂更有效地模拟珊瑚，诸如频道和礁石边缘的地形。已经开发了具有降水，植被，土壤类型和地形等输入数据的区域，并……在托多基河的时间历史上进行了验证，从2000年6月开始，托多基河的浊度史数据进行了验证，以检查珊瑚幼虫的长距离运输。这可能在1998年夏季使用HF海洋雷达系统的陆战测量的巨大漂白引起的重大漂白，这在恢复过程中可能很重要 ID。除了在水柱中的幼虫行为和底部设置外，还研究了实验室。这些结果表明Kerama Isls。可以充当一个来源区域，向冲绳ISL的西海岸提供可观数量珊瑚礁和沿海3-D电流的开发是基于SDS-Q3D模型和POM偶的Sigma坐标模型的基础。7）作为一种基本的理论工具，用于开发了珊瑚礁环境（例如圆锥形礁）的远程敏感性，例如圆锥形覆盖物，珊瑚罐的3-D光学模型。较少的