A comparative study on field test of sand collectors

doi:10.7522/j.issn.1000-694X.2020.00062

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (6): 33-42.DOI: 10.7522/j.issn.1000-694X.2020.00062

A comparative study on field test of sand collectors

Zhenyan Liu¹(), Chunping Chang¹(), Zhongling Guo¹, Jifeng Li¹, Rende Wang², Qing Li², Yapeng Huang¹, Xu Li¹, Jun Liu¹, Zhensheng Su³

^1.College of Resource and Environment Sciences / Hebei Key Laboratory of Environmental Change and Ecological Construction，Hebei Normal University，Shijiazhuang 050024，China
^2.Institute of Geographical Sciences / Hebei Engineering Research Center for Geographic Information Application，Heibei Academy of Sciences，Shijiazhuang 050011，China
^3.Affiliated Nationalities College of Hebei Normal University，Shijiazhuang 050091，China

Received:2020-02-11 Revised:2020-06-05 Online:2020-12-09 Published:2020-12-09
Contact: Chunping Chang

Abstract

Abstract:

By comparing the observation results of BSNE， MWAC and NFOC sand collectors in the same wind erosion events， we analyzed the characteristics of sediment transport rate in the directional and non-directional state of different types of sand collectors， and explored the effect on wind erosion about average wind speed， friction speed and turbulent structure. The results show that the sediment transport rate of the directional sand collector is obviously lower than that the non-direction sand collector， and the sediment transport rate of both BSNE and NFOC collectors is higher than that of MWAC collectors， but the correlation with wind speed is worse than MWAC collectors. Turbulence on short-time scale has little effect on the amount of sand sediments but has some effect on the sediment transport rate of directional and non-directional about MWAC collectors. By comparing the measured values of various sand collectors and the predicted values of various models， it is shown that the Kawamura model （0.140<RMSE<0.760） is closer to the measured values during the wind erosion events， and can reflect the wind erosion conditions in the region accurately. However， this conclusion still needs to be further discussed.

Key words: wind erosion events, sand collector, sediment transport rate, wind erosion model

CLC Number:

S157

Zhenyan Liu, Chunping Chang, Zhongling Guo, Jifeng Li, Rende Wang, Qing Li, Yapeng Huang, Xu Li, Jun Liu, Zhensheng Su. A comparative study on field test of sand collectors[J]. Journal of Desert Research, 2020, 40(6): 33-42.

Figures/Tables 12

Fig.1 Study area

Table 1 Setting of the sand collectors

项目	MWAC（非定向）	MWAC（定向）	BSNE	NFOC（非定向）	NFOC（定向）
集沙高度/cm	10 25 50 85	10 25 50 85	5 10 15 40	0~60	0~60
仪器数量	2	2	1	2	2

Fig.2 Wind direction that causes erosion during observation process

Table 2 Calculation results of wind factors

日期(月-日)	风蚀事件编号	开始时间	结束时间	U/(m·s^-1)	U_*/(m·s^-1)	Z₀/mm	g	W/（°）	P/（°）
05-12	1	11:00	15:50	10.21	0.477	0.0482	0.12	242.2	260
	2	16:30	17:30	9.38	0.454	0.038	0.12	248.6	260
	3	18:00	18:40	9.88	0.452	0.0298	0.11	249.4	270
05-13	4	10:00	12:30	9.38	0.417	0.0227	0.10	252.7	260
05-13	5	13:00	15:00	8.11	0.430	0.0235	0.10	249.4	260
05-15	6	12:20	14:30	9.65	0.454	0.0273	0.13	253.4	260
	7	14:50	15:20	10.82	0.475	0.0197	0.08	246.8	260
	8	15:20	15:50	11.03	0.474	0.0176	0.08	252.8	260

Table 3 Calculation results for each period of sand transport rate

日期（月-日）	开始时间	结束时间	BSNE /(g·cm^-2·min^-1)	定向NFOC /(g·cm^-2·min^-1)	非定向NFOC /(g·cm^-2·min^-1)	定向MWAC /(g·cm^-2·min^-1)	非定向MWAC /(g·cm^-2·min^-1)
05-12	11:00	15:50	0.035	0.027	0.033	0.019	0.034
	16:30	17:30	0.064	0.053	0.072	0.028	0.029
	18:00	18:40	0.038	0.032	0.033	0.019	0.021
05-13	10:00	12:30	0.009	0.011	0.012	0.004	0.005
	13:00	15:00	0.001	0.001	0.002	0.001	0.001
05-15	12:20	14:30	0.050	0.053	0.061	0.024	0.037
	14:50	15:20	0.240	0.219	0.235	0.080	0.086
	15:20	15:50	0.206	0.222	0.259	0.078	0.080

Fig.3 Correlation between directional and non-directional sediment transport rates

Fig.4 Correlation of sediment transport rate among different types of collector

Fig.5 Correlation between sediment transport rate and average wind speed

Fig.6 Correlation between the sediment transport rate and frictional velocity

Fig.7 Correlation between the difference of sediment transport rate and the degree of turbulence

Table 4 Sediment transport equations for different models

模型	方程
Bagnold模型^[22]	$q = C B ρ g u * 3 d D 12$
Kawamura模型^[23]	$q = C K ρ g u * - u * t u * + u * t 2$
Zingg模型^[24]	$q = C z d D 34 ρ g τ 0 ρ 32$
Lettau-Lettau模型^[25]	$q = C L d D 12 ρ g u * 2 u * - u * t$
Hsu模型^[26]	$q = C H u * g D 12 3$

Table 4 Sediment transport equations for different models

模型	方程
Bagnold模型^[22]	$q = C B ρ g u * 3 d D 12$
Kawamura模型^[23]	$q = C K ρ g u * - u * t u * + u * t 2$
Zingg模型^[24]	$q = C z d D 34 ρ g τ 0 ρ 32$
Lettau-Lettau模型^[25]	$q = C L d D 12 ρ g u * 2 u * - u * t$
Hsu模型^[26]	$q = C H u * g D 12 3$

Table 5 Predicted values of five different models and measured results

	Bagnold模型^[22]		Kawamura模型^[23]		Zingg模型^[24]		Lettau-Lettau模型^[25]		Hsu模型^[26]
	R²	RMSE	R²	RMSE	R²	RMSE	R²	RMSE	R²	RMSE
非定向NFOC	0.6801	0.777	0.6793	0.760	0.6801	0.788	0.6825	0.770	0.6801	0.774
非定向MWAC	0.3711	0.264	0.3706	0.250	0.3711	0.273	0.3724	0.258	0.3711	0.261
BSNE	0.7278	0.733	0.7268	0.716	0.7278	0.743	0.7309	0.726	0.7278	0.730
定向MWAC	0.5615	0.155	0.5607	0.140	0.5615	0.165	0.5636	0.149	0.5615	0.153
定向NFOC	0.6899	0.667	0.689	0.650	0.6899	0.678	0.6925	0.660	0.6899	0.664

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A comparative study on field test of sand collectors

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