Remotely sensed river surface features compared with modeling and in situ measurements
Remotely sensed river surface features compared with modeling and in situ measurements
复制标题
遥感河流表面特征与建模和现场测量的比较
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Bing Wang
中科院分区：
文献类型：
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作者：
W. Plant;R. Branch;G. Chatham;C. Chickadel;K. Hayes;Bronwyn Hayworth;A. Horner‐Devine;A. Jessup;D. Fong;O. Fringer;S. Giddings;S. Monismith;Bing Wang
[1]使用微波、可见光和红外频率的遥感获取了反映河流水深和水流的河流地貌图像。这些实验是在华盛顿州埃弗雷特的斯诺霍米什河口附近的Jetty Island进行的，在那里，复杂的潮汐流动发生在不同的水深测量上，这是这些实验的一部分。X波段(9.36 GHz)多普勒雷达在河岸运行，在许多潮汐周期中每20分钟产生一次归一化雷达截面和径向表面速度图像。可见光和红外线仪器是在飞机上飞行的。所有这些技术都显示了锋面特征的表面证据，流动越过了基床，流动受到深孔的调节。对这些特征进行了数值模拟，模拟结果与遥感观测结果吻合较好。在洞口附近进行的现场测量表明，测量速度的变化与图像中特征的出现有很好的相关性。除了潮汐相位外，这些特征在图像中的出现还取决于潮差。图像中观察到的表面粗糙度似乎是由水深测量和气流本身产生的，而不是由风浪的调制产生的。
[1] Images of river surface features that reflect the bathymetry and flow in the river have been obtained using remote sensing at microwave, visible, and infrared frequencies. The experiments were conducted at Jetty Island near the mouth of the Snohomish River at Everett, Washington, where complex tidal flow occurs over a varied bathymetry, which was measured as part of these experiments. An X band (9.36 GHz) Doppler radar was operated from the river bank and produced images of normalized radar cross sections and radial surface velocities every 20 min over many tidal cycles. The visible and infrared instruments were flown in an airplane. All of these techniques showed surface evidence of frontal features, flow over a sill, and flow conditioned by a deep hole. These features were modeled numerically, and the model results correspond well to the remote observations. In situ measurements made near the hole showed that changes in measured velocities correlate well with the occurrence of the features in the images. In addition to tidal phase, the occurrence of these features in the imagery depends on tidal range. The surface roughness observed in the imagery appears to be generated by the bathymetry and flow themselves rather than by the modulation of wind waves.