在加利福尼亚基勒沙丘附近更准确地预测沙运输的修正结果漂移势

IF 3.1 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Aeolian Research Pub Date : 2022-10-01 DOI:10.1016/j.aeolia.2022.100819
K.R. Kolesar, M. Mavko, E. Burgess , N. Nguyen, M.D. Schaaf
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引用次数: 2

摘要

基勒沙丘群是一个活跃的沙丘场,位于加利福尼亚州欧文斯(干)湖的西北角。先前的研究(Lancaster和McCarley-Holder, 2013)基于合成漂移势(RDP)的计算,暗示欧文斯河三角洲的暴露表面是基勒沙丘的沉积物来源。利用位于欧文斯河三角洲和基勒沙丘之间的沙通量监测站的测量数据,确定了使用RDP估算实际沙输运的准确性。结果表明,该地区的净平均输沙方向(133°)不能用RDP(97°)准确预测。因此,先前基于RDP的结论错误地将欧文斯河三角洲的沉积物作为基勒沙丘的来源。由于RDP计算被广泛使用,并且是根据气象测量确定净输沙方向和大小的方便方法,因此需要修改RDP以使其与沙通量测量结果更好地一致。研究发现,有两种修正方法可以改善计算的RDP和测量的输沙量之间的一致性:1)考虑沉积物有效性的时间变化(RDP = 130°),以及2)利用特定区域的阈值摩擦速度(RDP = 129°)。将这两种修正方法结合使用,结果与实测输砂量吻合良好(RDP = 137°),但没有进一步改善。这些发现表明,在估算风能输沙量时,有关地表特征(沉积物可利用性和地表粗糙度)的信息是重要的考虑因素。
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A modified resultant drift potential for more accurate prediction of sand transportation in the vicinity of the Keeler Dunes, California

The Keeler Dunes Complex is an active dune field located on the northwest corner of Owens (dry) Lake, California. Previous studies (Lancaster and McCarley-Holder, 2013) implicated the exposed surface of the Owens River Delta as the source of sediment for the Keeler Dunes based on the calculation of the Resultant Drift Potential (RDP). Measurements from sand flux monitoring stations located between the Owens River Delta and Keeler Dunes were used to determine the accuracy of using RDP for estimating actual sand transportation. It was found that the net average direction of sand transportation in this area (133°) was not accurately predicted by RDP (97°). Therefore, prior conclusions based on RDP erroneously attributed sediment from the Owens River Delta as a source for the Keeler Dunes. Since RDP calculations are widely used and a convenient method for determining the direction and magnitude of net sand transportation based on meteorological measurements, methods for modifying the RDP to achieve better agreement with sand flux measurements are desirable. Two modifications were found to improve the agreement between calculated RDP and measured sand transportation: 1) accounting for temporal variability in sediment availability (RDP = 130°), and 2) utilization of an area-specific threshold friction velocity (RDP = 129°). Combining these two modifications also resulted in good agreement (RDP = 137°) with the measured sand transportation but did not improve agreement further. These findings suggest that information about surface characteristics (sediment availability and surface roughness) are important to consider when estimating sand transportation based on wind energy.

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来源期刊
Aeolian Research
Aeolian Research GEOGRAPHY, PHYSICAL-
CiteScore
7.10
自引率
6.10%
发文量
43
审稿时长
>12 weeks
期刊介绍: The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.
期刊最新文献
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