农田近地表风沙流风程效应变化特征研究

doi:10.12118/j.issn.1000-6060.2021.597

Abstract

Abstract:

The fetch effect in aeolian sand transport is a cornerstone for wind erosion modeling and sand dune evaluation. The fetch effect refers to an increase in aeolian sand transport with downstream distance over an eroding surface. The maximum sand flux (f_max) and corresponding critical fetch length (L_sat) are the primary parameters related to the fetch effect. In this paper, a cyclone type instantaneous weighing aeolian sand trap (CCST) was used to observe four typical wind erosion events in 2017, 2018, and 2021 in two farmland regions of Kangbao County, Hebei Province, China. We analyzed the 5 min characteristics of the fetch effect of sand flux at a height of 5 cm above the ground surface. The results revealed that: (1) The aeolian sand flux near the surface increases with the increase in fetch length. (2) The variations of L_sat for the four wind erosion events range from 11 m to 280 m and were obvious and independent on wind velocity (U). (3) The relationship between f_max and U followed a power-law relationship. (4) The extent of the fetch effect may be related to factors including the soil wind erodibility and surface microrelief. More studies are required to explore how the factors related to soil wind erodibility and surface microrelief affect the fetch effect.

Key words: soil wind erosion, fetch effect, maximum sand flux, critical fetch length

FENG Zhe,LIU Ruijuan,BAI Yuchen,CHANG Chunping,GUO Zhongling,LI Jifeng,WANG Rende,LI Qing. Variation characteristics of the fetch effect of near surface aeolian sand flux for farmlands[J].Arid Land Geography, 2022, 45(5): 1500-1512.

Figures/Tables 9

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References 43

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试验地点	集沙仪类型	时间尺度	参考文献
得克萨斯州,美国	BSNE	单次风蚀事件	Fryrear等^[17]
得克萨斯州,美国	BSNE	单次风蚀事件	Gregory等^[28]
得克萨斯州,美国	BSNE	单次风蚀事件	Hagen^[29]
格林威治沙丘,爱德华王子岛国家森林公园,加拿大	Vertical traps^[30]	1 h	Bauer等^[31]
腾格里沙漠,中华人民共和国	平口集沙仪^[32]	10 min,20 min	Zhang等^[33]
河北省康保县,中华人民共和国	平口集沙仪	单次风蚀事件	牛艳频^[34]
萨缅托,阿根廷	MWAC	单次风蚀事件	Sterk等^[35]
马吉里根海岸,北爱尔兰	电子称重集沙仪^[36]	15 min	Lynch等^[19]

风蚀事件	时间	地点
事件1	2017年4月19日10:40—14:10	六段村（场地1）
事件2	2018年4月30日12:10—15:45	马场（场地2）
事件3	2021年4月15日13:25—14:55	马场（场地2）
事件4	2021年5月4日14:45—16:15	马场（场地2）

风蚀事件		f_max/g·cm^-2·min^-1	b/m	L_sat/m	R²	RMSE
事件1	最大值	5.97	68.099	104.00	0.84	1.35
	平均值	3.01	51.099	78.93	0.70	0.71
	最小值	0.57	43.604	67.00	0.58	0.16
事件2	最大值	1.18	169.800	258.00	0.96	0.72
	平均值	0.56	57.480	87.61	0.81	0.18
	最小值	0.12	26.510	41.00	0.54	0.01
事件3	最大值	18.26	184.300	280.00	0.97	1.10
	平均值	5.17	91.870	90.18	0.85	0.35
	最小值	0.07	18.970	58.51	0.67	0.01
事件4	最大值	2.02	95.360	127.00	0.86	0.15
	平均值	0.34	27.250	39.54	0.62	0.05
	最小值	0.08	7.090	11.00	0.40	0.01

Variation characteristics of the fetch effect of near surface aeolian sand flux for farmlands

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