土壤盐结皮表面粗糙度的量化及其对蒸发的影响

doi:10.12118/j.issn.1000-6060.2025.586

Abstract

Abstract:

Changes in the surface roughness of salt crusts affect evaporation by altering the surface area. Accurately quantifying roughness parameters is essential for improving the accuracy of evaporation models. However, existing methods for measuring the surface roughness of salt crusts are limited, and the mechanisms by which roughness influences evaporation remain unclear. Accordingly, this study utilized temporal grayscale image analysis combined with wavelet denoising to continuously monitor changes in the surface roughness of salt crusts and constructed a conceptual curve depicting roughness evolution. Existing evaporation models were then refined to clarify the relationship between roughness and evaporation. The results revealed the following: (1) Salt concentration affects the fluctuation of surface roughness during crust evolution, with the amplitude of fluctuations gradually decreasing as concentration increases. (2) Under varying salinity conditions, the surface roughness of the salt crust exhibited a consistent trend of “increase-decrease-slight fluctuating recovery” across different evaporation stages. High salinity accelerated the precipitation and aggregation of salt crystals, reducing the magnitude of roughness variation by as much as 50% compared to lower concentration solutions. (3) The evaporation rate exhibited a significant positive correlation with the surface roughness (R_a) of the salt crust (r=0.72, P<0.05). By incorporating a roughness parameter into Fick’s law, we improved the model, resulting in higher estimation accuracy for tests involving medium to high salt concentrations. This study offers new theoretical and methodological insights into understanding soil water transport processes influenced by salt crusts.

Key words: salt crust, surface roughness, temporal grayscale image analysis, wavelet denoising

GUO Yubo, LI Xinhu, WANG Yihan, WANG Hongchao. Quantification of surface roughness of soil salt crusts and its effect on evaporation[J].Arid Land Geography, 2026, 49(10): 2134-2144.

Figures/Tables 8

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样本	天数/d	蒸发速率/mm$\bullet $d^-1	R_a	R_q	R_Z	skewness	kurtosis
1wt%	43	8.98	32.85	44.35	250.91	1.16	4.22
	63	5.41	44.84	56.53	261.96	-1.00	3.24
	80	5.29	25.02	31.58	252.82	-0.97	4.10
5wt%	12	8.58	26.75	33.36	267.43	0.51	3.27
	25	6.28	65.07	69.09	256.60	-0.35	1.45
	30	3.42	52.54	62.40	255.94	-0.96	2.36
10wt%	3	7.52	46.26	51.80	244.41	0.41	1.69
	11	2.92	17.77	24.16	203.19	-1.33	6.78
	22	1.14	20.07	25.35	162.04	-0.62	3.34
15wt%	3	7.04	34.08	40.49	235.68	-0.35	2.28
	11	2.63	22.27	27.63	158.41	-0.52	2.95
	17	1.10	24.30	29.18	159.74	-0.55	2.59
20wt%	2	9.38	19.16	23.52	223.07	0.15	2.61
	5	6.72	15.72	19.11	114.33	0.07	2.44
	12	0.60	17.50	21.28	116.08	0.31	2.45
25wt%	4	6.68	15.82	19.90	150.85	-0.04	2.88
	18	23.26	16.06	19.68	125.20	-0.30	2.65
	57	4.87	13.32	16.45	129.52	0.35	2.73

Quantification of surface roughness of soil salt crusts and its effect on evaporation

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[2]	WANG Hongchao, LI Xinhu, GUO Min, LI Jialin. Dynamic variation of energy balance under the influence of salt-crusted soil formation and development [J]. Arid Land Geography, 2024, 47(3): 424-432.
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[4]	TANG Yang,LI Xinhu,GUO Min,WANG Hongchao. Formation process of soil salt crust and its influence mechanism on evaporation under different initial salt concentrations [J]. Arid Land Geography, 2022, 45(4): 1137-1145.
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