[Objective] The aim was to extract red tide information in Haizhou Bay on the basis of multi-source remote sensing data.[Method] Red tide in Haizhou Bay was studied based on multi-source remote sensing data,such as IR...[Objective] The aim was to extract red tide information in Haizhou Bay on the basis of multi-source remote sensing data.[Method] Red tide in Haizhou Bay was studied based on multi-source remote sensing data,such as IRS-P6 data on October 8,2005,Landsat 5-TM data on May 20,2006,MODIS 1B data on October 6,2006 and HY-1B second-grade data on April 22,2009,which were firstly preprocessed through geometric correction,atmospheric correction,image resizing and so on.At the same time,the synchronous environment monitoring data of red tide water were acquired.Then,band ratio method,chlorophyll-a concentration method and secondary filtering method were adopted to extract red tide information.[Result] On October 8,2005,the area of red tide was about 20.0 km2 in Haizhou Bay.There was no red tide in Haizhou bay on May 20,2006.On October 6,2006,large areas of red tide occurred in Haizhou bay,with area of 436.5 km2.On April 22,2009,red tide scattered in Haizhou bay,and its area was about 10.8 km2.[Conclusion] The research would provide technical ideas for the environmental monitoring department of Lianyungang to implement red tide forecast and warning effectively.展开更多
网纹红土在中国南方地区有着广泛的分布,常见于各类岩土工程中。目前对网纹红土的研究主要集中在成因和粒度特性等方面,对于其非饱和特性方面的研究相对有限。本文采用滤纸法测量不同饱和度条件下网纹红土的基质吸力,利用Van Genuchten...网纹红土在中国南方地区有着广泛的分布,常见于各类岩土工程中。目前对网纹红土的研究主要集中在成因和粒度特性等方面,对于其非饱和特性方面的研究相对有限。本文采用滤纸法测量不同饱和度条件下网纹红土的基质吸力,利用Van Genuchten模型得到网纹红土的干燥-浸湿过程的土水特征曲线。研究发现,由于网纹红土孔隙较小且均匀,使得网纹红土存在进气值(约为100 k Pa)相对于一般黏土较大、其土水特征曲线没有明显的残余段。利用干燥-浸湿过程的土水特征曲线对一维无限边坡的干燥和浸湿过程稳定性进行研究,发现在饱和度相同的情况下,边坡处于脱湿过程的稳定性要高于吸湿过程。随着深度的增加,脱湿与吸湿过程稳定性系数相差值减小;随着饱和度的提高,两者差值也出现减小的趋势。同时,网纹红土中基质吸力对抗滑力的贡献度较大,使得网纹红土质边坡较为稳定。展开更多
基金Supported by Science and Technology Project of Lianyungang City(SH0917)
文摘[Objective] The aim was to extract red tide information in Haizhou Bay on the basis of multi-source remote sensing data.[Method] Red tide in Haizhou Bay was studied based on multi-source remote sensing data,such as IRS-P6 data on October 8,2005,Landsat 5-TM data on May 20,2006,MODIS 1B data on October 6,2006 and HY-1B second-grade data on April 22,2009,which were firstly preprocessed through geometric correction,atmospheric correction,image resizing and so on.At the same time,the synchronous environment monitoring data of red tide water were acquired.Then,band ratio method,chlorophyll-a concentration method and secondary filtering method were adopted to extract red tide information.[Result] On October 8,2005,the area of red tide was about 20.0 km2 in Haizhou Bay.There was no red tide in Haizhou bay on May 20,2006.On October 6,2006,large areas of red tide occurred in Haizhou bay,with area of 436.5 km2.On April 22,2009,red tide scattered in Haizhou bay,and its area was about 10.8 km2.[Conclusion] The research would provide technical ideas for the environmental monitoring department of Lianyungang to implement red tide forecast and warning effectively.
文摘网纹红土在中国南方地区有着广泛的分布,常见于各类岩土工程中。目前对网纹红土的研究主要集中在成因和粒度特性等方面,对于其非饱和特性方面的研究相对有限。本文采用滤纸法测量不同饱和度条件下网纹红土的基质吸力,利用Van Genuchten模型得到网纹红土的干燥-浸湿过程的土水特征曲线。研究发现,由于网纹红土孔隙较小且均匀,使得网纹红土存在进气值(约为100 k Pa)相对于一般黏土较大、其土水特征曲线没有明显的残余段。利用干燥-浸湿过程的土水特征曲线对一维无限边坡的干燥和浸湿过程稳定性进行研究,发现在饱和度相同的情况下,边坡处于脱湿过程的稳定性要高于吸湿过程。随着深度的增加,脱湿与吸湿过程稳定性系数相差值减小;随着饱和度的提高,两者差值也出现减小的趋势。同时,网纹红土中基质吸力对抗滑力的贡献度较大,使得网纹红土质边坡较为稳定。
