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坐标旋转订正对农田林网水热通量测算精度的影响
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Journal Article
坐标旋转订正对农田林网水热通量测算精度的影响
2015
Overview
农田防护林的特殊结构使附近农田地表大气运动形成了特有的动力学和热力学效应，影响着周边物质和能量交换过程。坐标旋转订正方法的选择成为提高农田防护林水热通量测算精度的核心问题，选取2012年3月9日至5月7日共60d的防护林网内农田的涡动相关观测数据，对相关湍流特征及能量闭合率等关键参数进行坐标旋转订正并进行比较，结果表明：（1）在整个试验过程中，采用平面拟合法进行坐标旋转时，当订正参数的计算周期小于15d时，x-z平面内旋转角度有一定的波动，而在计算周期大于15d后，则基本维持在一2．8。左右。采用二次旋转法订正的x-z平面内旋转角度受原始水平风向的影响始终很大；（2）2种坐标旋转方法对于三维风速的处理结果基本一致，在风速较大的情况下，需要考虑坐标旋转方法的选择对结果的影响。二次旋转方法订正后的垂直风速全部为零，平面拟合方法订正后的垂直风速接近于0；（3）平面拟合订正后摩擦风速基本与订正前一致，而二次旋转方法订正后的结果增大了将近5％；（4）平面拟合方法对显热通量及潜热通量的订正误差较小，二次旋转方法则分别将原始测得值提高了5％左右；（5）防护林网通量的能量闭合率经过平面拟合订正后提高了17％，而经过二次旋转法订正后则提高了30％。总之，坐标旋转方法可以对观测设备倾斜引起的误差进行订正，订正后的结果比订正前更精确。二次坐标旋转方法因为可以订正较短时间段内的单组数据，比较适用于下垫面情况变化较快时的观测；平面拟合方法适用于观测系统及其周围环境在整个测量过程中相对稳定时的观测。二次旋转方法对防护林网水热通量订正更好。
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