内河水深遥感的应用

Water depth remote sensing for inland rivers

利用陆地卫星TM影像研究闽江竹岐至侯官河段的水深,建立了遥感信息与水深之间关系的数学模型.研究表明:用最低通航水位时的水域边界裁取研究水域,可消除边界点因水陆信息混合产生的误差,提高遥感水深精度;用两个时相遥感所得的水下地形计算河床冲淤值,进一步削减了由遥感信息源转换成水深信息时的误差,结果与用实测地形资料计算的结果基本一致,能满足河床演变分析和冲淤量计算的要求.

A mathematical model was developed for the relationship between the remote sensing information and water depth based on a study of the water depth of the ZhuqiHouguan section of the Minjiang River by use of the TM image spectrum of the land satellite technology. The research shows that the determination of the region to be studied according to the boundary of the water area at the lowest navigable stage can eliminate the error at the boundary points caused by the mixed waterland information and improve the precision of remote sensing water depth. It is also indicated that the calculation of riverbed scour and deposition based on the underwater topography obtained by remote sensing at two intervals can reduce the error caused by the conversion of the remote sensing information into the water depth of rivers. The result calculated with remote sensing information is in good agreement with that calculated with the measured data, showing that water depth remote sensing can meet the requirement for analysis of riverbed evolution and the precision of calculation of riverbed scour and deposition.