High-frequency measurements are available at five heights within and above a row-gap trellised vineyard located on a 7 $$^{\circ }$$ ∘ slope in the Southern Okanagan Valley, British Columbia, Canada. During a 3-week campaign in July 2016, approximately 17% of the nocturnal conditions exhibit drainage flow along the local slope. Drainage conditions are characterized by temperature inversions beginning around $$z/h_c = 0.39$$ z / h c = 0.39 , where z is the height above ground level (a.g.l.) and $$h_c$$ h c is the canopy height (2.3 m a.g.l.), and near-surface lapses. Changes in the sign of the streamwise momentum flux suggest the presence of a jet maximum around $$z/h_c = 1.65$$ z / h c = 1.65 , while a weak inflection point is observed near the canopy top, suggesting dynamical influences from both the drainage layer and canopy layer on the turbulent flow field. The largest observed fluxes in both the streamwise momentum flux and the turbulent sensible heat flux are near the top of the canopy, consistent with the location of the inflection point. Calculated two-point length scales from along-slope distributed temperature measurements reveal that turbulent structures are smallest near the canopy top. Conditional sampling of the three-dimensional velocity components and temperature indicate that a large fraction of canopy-layer transport is driven by canopy top turbulence, with sweeps dominating over ejections, particularly at $$z/h_c = 0.65$$ z / h c = 0.65 .

中文翻译：

---

通过倾斜葡萄园的夜间排水流中的湍流热和动量交换

高频测量可在位于加拿大不列颠哥伦比亚省南奥肯那根山谷的 7 $$^{\circ }$$ ∘ 斜坡上的排间隙格子葡萄园内和上方的五个高度进行。在 2016 年 7 月为期 3 周的运动中，大约 17% 的夜间条件沿着当地斜坡呈现排水流。排水条件的特征在于从 $$z/h_c = 0.39$$ z / hc = 0.39 左右开始的温度反转，其中 z 是地面以上的高度 (agl)，$$h_c$$ hc 是冠层高度 (2.3 m agl ) 和近地表失效。流向动量通量符号的变化表明在 $$z/h_c = 1.65$$ z / hc = 1.65 附近存在喷射最大值，而在冠层顶部附近观察到一个弱拐点，表明排水层和冠层对湍流场的动力学影响。流向动量通量和湍流感热通量中观测到的最大通量都在冠层顶部附近，与拐点的位置一致。从沿坡分布温度测量计算出的两点长度尺度表明，湍流结构在冠层顶部附近最小。三维速度分量和温度的条件采样表明，冠层传输的很大一部分是由冠层顶部湍流驱动的，扫掠主导着喷射，特别是在 $$z/h_c = 0.65$$ z / hc = 0.65 . 流向动量通量和湍流感热通量中观测到的最大通量都在冠层顶部附近，与拐点的位置一致。从沿坡分布温度测量计算出的两点长度尺度表明，湍流结构在冠层顶部附近最小。三维速度分量和温度的条件采样表明，冠层传输的很大一部分是由冠层顶部湍流驱动的，扫掠主导着喷射，特别是在 $$z/h_c = 0.65$$ z / hc = 0.65 . 流向动量通量和湍流感热通量中观测到的最大通量都在冠层顶部附近，与拐点的位置一致。从沿坡分布温度测量计算出的两点长度尺度表明，湍流结构在冠层顶部附近最小。三维速度分量和温度的条件采样表明，冠层传输的很大一部分是由冠层顶部湍流驱动的，扫掠主导着喷射，特别是在 $$z/h_c = 0.65$$ z / hc = 0.65 .