The characteristics of inner boundary layer airflow over reversing dunes and its effect on dune morphological evolution

doi:10.7522/j.issn.1000-694X.2020.00112

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (2): 1-8.DOI: 10.7522/j.issn.1000-694X.2020.00112

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The characteristics of inner boundary layer airflow over reversing dunes and its effect on dune morphological evolution

Kaijia Pan¹^,²(), Zhengcai Zhang¹(), Aimin Lang¹^,²

^1.Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2020-07-06 Revised:2020-10-12 Online:2021-03-20 Published:2021-03-26
Contact: Zhengcai Zhang

Abstract

Abstract:

The morphology-dynamic processing of reversing dune is an important issue in Aeolian geomorphology， but a little research have been done for these dunes， which limits our understanding of the dunes formation and development. For this reason， a developing reversing dunes in the southeast edge of Tengger Desert was selected. Ten-dimensional ultrasonic anemometer was used and set up at top， crest leeward stoss， dune toe， and windward stoss at 0.25 m and 0.5 m height over dune surface. The results indicated that：（1） The direction of airflow affects characteristics of airflow. Wind directions were not completely symmetry on the left and right sides of an axis perpendicular to the crest at 0.25 m height. When the flow angle between airflow directions and the direction of perpendicular line to the crest are negative， the wind speed at the windward slope recovers slowly. （2） The airflow characteristics of leeward slope are controlled by the wind direction. The variation of airflow at 0.25 m and 0.5 m height are similar， and deflection occurs in the middle of the leeward slope， and reversing deflection occurs within a range of 10° between the airflow direction at the top of the dune and perpendicular to the crest. However， when the wind at the top of the dune is 285°-315°， the deflection at 0.25 m is greater than that 0.5 m. The wind speed of 0.25 m and 0.5 m at the leeward slope is inconsistent on both sides of the direction perpendicular line to the crest. （3） Dune surface airflow affects dune morphology. During the observation period， the crest of dune moved significantly with a movement value of 0.33 m. Sediment accumulation occurred on leeward slope with the maximum thickness of 0.44 m， and erosion occurred on windward slope with the maximum depth of 0.43 m. The results of this study are important to clarify the effect of wind in the evolution of dune morphology and provide data for numerical simulation.

Key words: reversing dunes, sonic anemometer, wind speed, wind direction, morphology

CLC Number:

P931.3

Kaijia Pan, Zhengcai Zhang, Aimin Lang. The characteristics of inner boundary layer airflow over reversing dunes and its effect on dune morphological evolution[J]. Journal of Desert Research, 2021, 41(2): 1-8.

Figures/Tables 8

References 24

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风速 /(m·s^-1)	位置				风速 /(m·s^-1)	位置
风速 /(m·s^-1)	脊线	背风坡中部	背风坡底部	迎风坡底部	风速 /(m·s^-1)	脊线	背风坡中部	背风坡底部	迎风坡底部
丘顶风向 285°－294°					丘顶风向 295°－304°
<6(N=32)	0.63/296	0.38/189	0.4/259	0.48/263	<6(N=32)	0.55/237	0.34/174	0.34/219	0.46/269
6—8(N=17)	0.91/283	0.28/166	0.24/180	0.34/251	6—8(N=24)	0.91/291	0.26/123	0.3/115	0.36/299
8—10(N=11)	0.88/284	0.23/158	0.26/191	0.42/287	8—10(N=8)	0.91/282	0.2/154	0.24/186	0.24/271
<10(N=2)	0.95/286	1101	0.27/166	0.24/344	>10(N=3)	0.88/288	0.15/182	0.24/191	0.27/227
丘顶风向 305°—314°					丘顶风向 315°
<6(N=38)	0.76/282	0.41/139	0.38/170	0.42/265	<6(N=3)	1.01/306	0.25/119	0.42/90	0.47/323
6—8(N=41)	0.89/304	0.3/128	0.31/127	0.41/276	6—8(N=3）	0.91/304	0.3/95	0.47/63	0.57/331
8—10(N=15)	0.88/306	0.29/99	0.29/151	0.47/351	8—10(N=2)	0.99/317	0.32/78	0.55/59	0.67/354
>10(N=3)	0.81/302	0.27/76	0.17/205	0.22/364	>10(N=0)	—	—	—	—
丘顶风向 316°—325°					丘顶风向 326°—335°
<6(N=45)	0.92/310	0.4/121	0.45/123	0.67/356	<6(N=34)	1/325	0.46/80	0.53/17	0.65/1
6—8(N=63)	0.89/316	0.37/104	0.34/105	0.49/360	6—8(N=61)	0.91/323	0.38/96	0.39/76	0.56/3
8—10(N=29)	0.86/313	0.36/114	0.34/98	0.49/353	8—10(N=27)	0.91/321	0.42/96	0.36/72	0.46/357
>10(N=7)	0.86/313	0.34/90	0.34/25	0.45/332	>10(N=7)	0.86/324	0.31/74	0.43/79	0.48/352
丘顶风向 336°—345°					丘顶风向 346°—355°
<6(N=45)	0.98/330	0.52/77	0.55/19	0.78/359	<6(N=14)	1/345	0.45/74	0.62/43	0.8/355
6—8(N=41)	0.99/335	0.54/81	0.5/52	0.68/355	6—8(N=32)	1/334	0.48/74	0.59/46	0.75/1
8—10(N=23)	0.96/335	0.47/84	0.5/53	0.64/355	8—10(N=12)	0.95/344	0.45/77	0.51/51	0.62/360
>10(N=3)	1.01/337	0.4/93	0.39/80	0.31/360	>10(N=5)	0.96/344	0.46/79	0.54/65	0.64/357

风速 /(m·s^-1)	位置				风速 /(m·s^-1)	位置
风速 /(m·s^-1)	脊线	背风坡中部	背风坡底部	迎风坡底部	风速 /(m·s^-1)	脊线	背风坡中部	背风坡底部	迎风坡底部
丘顶风向 285°－294°					丘顶风向 295°－304°
<6(N=32)	0.63/296	0.38/189	0.4/259	0.48/263	<6(N=32)	0.55/237	0.34/174	0.34/219	0.46/269
6—8(N=17)	0.91/283	0.28/166	0.24/180	0.34/251	6—8(N=24)	0.91/291	0.26/123	0.3/115	0.36/299
8—10(N=11)	0.88/284	0.23/158	0.26/191	0.42/287	8—10(N=8)	0.91/282	0.2/154	0.24/186	0.24/271
<10(N=2)	0.95/286	1101	0.27/166	0.24/344	>10(N=3)	0.88/288	0.15/182	0.24/191	0.27/227
丘顶风向 305°—314°					丘顶风向 315°
<6(N=38)	0.76/282	0.41/139	0.38/170	0.42/265	<6(N=3)	1.01/306	0.25/119	0.42/90	0.47/323
6—8(N=41)	0.89/304	0.3/128	0.31/127	0.41/276	6—8(N=3）	0.91/304	0.3/95	0.47/63	0.57/331
8—10(N=15)	0.88/306	0.29/99	0.29/151	0.47/351	8—10(N=2)	0.99/317	0.32/78	0.55/59	0.67/354
>10(N=3)	0.81/302	0.27/76	0.17/205	0.22/364	>10(N=0)	—	—	—	—
丘顶风向 316°—325°					丘顶风向 326°—335°
<6(N=45)	0.92/310	0.4/121	0.45/123	0.67/356	<6(N=34)	1/325	0.46/80	0.53/17	0.65/1
6—8(N=63)	0.89/316	0.37/104	0.34/105	0.49/360	6—8(N=61)	0.91/323	0.38/96	0.39/76	0.56/3
8—10(N=29)	0.86/313	0.36/114	0.34/98	0.49/353	8—10(N=27)	0.91/321	0.42/96	0.36/72	0.46/357
>10(N=7)	0.86/313	0.34/90	0.34/25	0.45/332	>10(N=7)	0.86/324	0.31/74	0.43/79	0.48/352
丘顶风向 336°—345°					丘顶风向 346°—355°
<6(N=45)	0.98/330	0.52/77	0.55/19	0.78/359	<6(N=14)	1/345	0.45/74	0.62/43	0.8/355
6—8(N=41)	0.99/335	0.54/81	0.5/52	0.68/355	6—8(N=32)	1/334	0.48/74	0.59/46	0.75/1
8—10(N=23)	0.96/335	0.47/84	0.5/53	0.64/355	8—10(N=12)	0.95/344	0.45/77	0.51/51	0.62/360
>10(N=3)	1.01/337	0.4/93	0.39/80	0.31/360	>10(N=5)	0.96/344	0.46/79	0.54/65	0.64/357

高度	285°—304°		305°—314°		315°		316°—325°		326°—355°
高度	背风坡中部	背风坡底部	背风坡中部	背风坡底部	背风坡中部	背风坡底部	背风坡中部	背风坡底部	背风坡中部	背风坡底部
0.25 m	119—146	70—97	177	157	144	117	151	151	85—120	58—122
0.5 m	92—113	60—90	162	147	151	137	154	177	100—130	61—146

高度	285°—304°		305°—314°		315°		316°—325°		326°—355°
高度	背风坡中部	背风坡底部	背风坡中部	背风坡底部	背风坡中部	背风坡底部	背风坡中部	背风坡底部	背风坡中部	背风坡底部
0.25 m	119—146	70—97	177	157	144	117	151	151	85—120	58—122
0.5 m	92—113	60—90	162	147	151	137	154	177	100—130	61—146

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The characteristics of inner boundary layer airflow over reversing dunes and its effect on dune morphological evolution

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References 24

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丘顶风向	脊线	背风坡中部	背风坡底部	迎风坡底部
285°—294°	-10	-2	15	51
295°—304°	-18	-8	18	48
305°—314°	-5	-2	8	0
315°	2	7	-8	-3
316°—325°	2	10	-13	-4
326°—335°	1	3	-10	3
336°—345°	1	0	-39	6
346°—355°	2	-1	10	4