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首页> 外文期刊>Open Journal of Modern Hydrology >Remote Monitoring of Surfaces Wetted for Dust Control on the Dry Owens Lakebed, California
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Remote Monitoring of Surfaces Wetted for Dust Control on the Dry Owens Lakebed, California

机译：加利福尼亚干欧文斯湖床湿润粉尘控制表面的远程监控

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Extensive dust control on the dry Owens Lake mainly uses constructed basins that are flooded with shallow depths of fresh water. This dust control is mandated by law as a minimum percent of the area of each individual wetting basin. Wetted surfaces are evaluated for area and degree of wetness using the shortwave infrared (SWIR) band of Landsat TM, or similar earth observation satellite sensor. The SWIR region appropriate for these measurements lies within the electromagnetic spectrum between about 1.5 and 1.8 μm wavelengths. A threshold value for Landsat TM5 band 5 reflectance of 0.19 was found to conform with surfaces having a threshold for adequate wetting at a nascent point where rapid drying would occur following loss of capillary connection with groundwater. This threshold is robust and requires no atmospheric correction for the effects of aerosol scatter and attenuation as long as the features on the image appear clear. Monthly monitoring of surface wetting has proven accurate, verifiable and repeatable using these methods. This threshold can be calibrated for any Earth observation satellite that records the appropriate SWIR region. The monitoring program is expected to provide major input for the final phase of the dust control program that will have a focus to conserve water and resources.
机译：在干燥的欧文斯湖上进行广泛的扬尘控制主要是使用人工盆地，这些盆地被浅浅的淡水淹没。法律规定，此粉尘控制必须是每个湿盆面积的最小百分比。使用Landsat TM或类似的地球观测卫星传感器的短波红外（SWIR）波段，评估湿润表面的面积和湿度。适用于这些测量的SWIR区域位于约1.5至1.8μm波长之间的电磁光谱内。发现Landsat TM5波段5反射率的阈值为0.19，与在初生点具有足够湿润阈值的表面相符，在新生点处，与地下水的毛细管连接丧失后，将发生快速干燥。该阈值是可靠的，并且只要图像上的特征看起来清晰，就不需要对大气的气溶胶散射和衰减进行校正。使用这些方法，每月对表面润湿进行监测已被证明是准确，可验证和可重复的。可以为记录适当SWIR区域的任何地球观测卫星校准此阈值。预计该监控程序将为粉尘控制程序的最后阶段提供主要投入，该阶段的重点是节约用水和资源。

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