洪积扇末端泥漠近地表风沙流结构特征
|
江艳冰(2001-),女,硕士研究生,主要从事风沙物理与风沙工程学研究. E-mail: jiangyanbing@nieer.ac.cn |
收稿日期: 2024-08-17
修回日期: 2024-10-20
网络出版日期: 2025-08-13
基金资助
国家自然科学基金(42171015)
第三次新疆综合科学考察项目(2021xjkk0305)
甘肃省自然科学基金(24JRRA088)
Structure of near-surface wind-blown sand over dry playa at the end of an alluvial fan
Received date: 2024-08-17
Revised date: 2024-10-20
Online published: 2025-08-13
江艳冰 , 周倩 , 王洪涛 , 谭立海 . 洪积扇末端泥漠近地表风沙流结构特征[J]. 干旱区研究, 2025 , 42(3) : 568 -576 . DOI: 10.13866/j.azr.2025.03.16
The structure of near-surface wind-blown sand flow over dry playa represents the macroscopic characteristics of micro-wind-blown sand movement at such locations. It is important to study such sand flow in order to understand the processes of wind-blown sand movement and dust emissions in dry playa. In this study, a dry playa at the end of a typical alluvial fan around North Mountain of the Ejin Banner was selected for analysis and field observations were conducted on its near-surface wind-blown sand flow structure. The results revealed an exponential wind speed profile over the dry playa surface and the aerodynamic roughness z0 was 0.058 mm, which is smaller than those of sand and gobi surfaces. The sand flux of mixed-particle-size sand decreased exponentially with height over the dry playa surface. The average saltation height zq of sand particles in the desert-crossing wind-sand flow was 15 cm, and 90% of the transport sand was concentrated within the height of 0-34 cm. The vertical profile curve of the sand flux in the fine-sand-particle-size group was similar to that of the mixed-particle-size sand. With increasing particle size, the sand flux in the dry playa changed with height, and the “elephant nose” curve transitioned to an “oblique Z” curve for coarse sand. Thus, this work proposes the mode of sand movement on the dry playa bed.
Key words: dry playa; wind-blown sand structure; wind velocity profile; saltation
表1 相近摩阻风速u*下不同地表类型空气动力学粗糙度z0Tab. 1 Aerodynamic roughness z0 of different surface types under similar friction wind speed u* |
| [1] |
张煜星. 论荒漠与荒漠化程度评价[J]. 干旱区研究, 1996, 13(2): 77-80.
[
|
| [2] |
杨发相, 桂东伟, 岳健, 等. 干旱区荒漠分类系统探讨——以新疆为例[J]. 干旱区资源与环境, 2015, 29(11): 145-151.
[
|
| [3] |
|
| [4] |
吴正. 风沙地貌与治沙工程学[M]. 北京: 科学出版社, 2003: 15-30.
[
|
| [5] |
邹学勇, 董光荣, 王周龙. 戈壁风沙流若干特征研究[J]. 中国沙漠, 1995, 15(4): 368-373.
[
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
杨保, 邹学勇, 董光荣. 风沙流中颗粒跃移研究的某些进展与问题[J]. 中国沙漠, 1999, 19(2): 173-178.
[
|
| [11] |
冯大军, 倪晋仁, 李振山. 风沙流中不同粒径组沙粒的输沙量垂向分布实验研究[J]. 地理学报, 2007, 62(11): 1194-1203.
[
|
| [12] |
屈建军, 黄宁, 拓万全, 等. 戈壁风沙流结构特性及其意义[J]. 地球科学进展, 2005, 20(1): 19-23.
[
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
| [19] |
柳丽. 基于多尺度湍流运动重构的风沙流模拟及粉尘空间分布研究[D]. 兰州: 兰州大学, 2020.
[
|
| [20] |
|
| [21] |
|
| [22] |
陈大伟. 金塔县黑河灌区水资源供需平衡分析[J]. 甘肃水利水电技术, 2017, 53(3): 51-55.
[
|
| [23] |
李强. 酒额铁路酒泉至东风段典型沙害区段风沙环境特征[J]. 中国沙漠, 2023, 43(6): 220-228.
[
|
| [24] |
|
| [25] |
|
| [26] |
|
| [27] |
|
| [28] |
|
| [29] |
|
| [30] |
刘小平, 董治宝. 砾石床面的空气动力学粗糙度[J]. 中国沙漠, 2003, 23(1): 38-45.
[
|
| [31] |
|
| [32] |
|
| [33] |
张正偲, 董治宝. 腾格里沙漠东南部野外风沙流观测[J]. 中国沙漠, 2013, 33(4): 973-980.
[
|
| [34] |
|
| [35] |
|
| [36] |
李凯崇, 薛春晓, 蒋富强, 等. 高原与戈壁地区风沙流结构特性差异研究[J]. 铁道工程学报, 2014, 31(7): 7-11.
[
|
/
| 〈 |
|
〉 |