额哈铁路内蒙古段大风条件下几种下垫面风沙流输沙的粒度特征

doi:10.12118/j.issn.1000-6060.2024.560

Abstract

Abstract:

This study investigates the grain size characteristics of wind-blown sand flow over the gravel desert, moving sand dunes, and eroded hills, as well as the corresponding protective measures along a railway in the Gobi area. The study is based on an analysis of the grain size characteristics of sand particles in the wind-blown sand flows of different underlying surfaces in the Inner Mongolia section of the Ejina-Hami (E-Ha) Railway, in the Gobi area, combined with field observations and indoor laser-based particle-size analysis methods. Results revealed that the sand on the underlying surface of the K728+000~K843+000 section of the E-Ha Railway was mainly composed of fine sand, medium sand, and very fine sand. The particle-size frequency curve shows one peak distribution. The sand flow structure was exponentially distributed under natural conditions and sand control projects, and the sand composition differed significantly at various heights. In addition, under natural conditions, there was no significant change in sand material in the 0-4 cm layer, whereas in the 4-10 cm layer, very fine sand and fine sand were easily carried to higher levels by wind. The 10-50 cm layer was primarily composed of fine and medium sand, accounting for 83.57% of the railway sand. The blown-sand prevention and control project can decrease the fine and medium sand content in the low layer (0-20 cm) by 53.98% and effectively intercept 37.47% of the very fine sand in the high layer (20-50 cm). Lastly, in the height range of 0-50 cm, the vertical differentiation of each particle size component was significant. When the height increased, the average particle size decreased and the content of fine sand gradually increased. In the wind-blown sand flow of each underlying surface, there was a significant correlation between the contents of very fine sand and fine sand and height (P≤0.05). The sorting coefficient, kurtosis value, and skewness value increased with increasing height. When the height exceeded 50 cm, the sorting of sand in the wind-sand flow became worse and the characteristics of each particle size did not change significantly.

Key words: wind-sand flow, grain-size parameter, underlying surface, Ejina-Hami Railway, Gobi area

GUO Qi, YAN Min, ZUO Hejun, LIU Yaqi, XU Fujian, JIANG Chunyu. Grain size characteristics of wind-blown sand transport on several underlying surfaces under strong wind conditions in Inner Mongolia section of Ejina-Hami Railway[J].Arid Land Geography, 2025, 48(12): 2158-2168.

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References 28

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编号	土样采集地区	粗砂（Φ<1）/%	中砂（Φ1~2）/%	细砂（Φ2~3）/%	极细砂（Φ3~4）/%	粉粒（Φ4~9）/%	黏粒（Φ>9）/%
LDSQ	流动沙丘	2.98	34.50	39.59	18.21	1.75	2.97
NLW+SS	尼龙网方格+梭梭措施	0.56	45.93	52.46	1.01	0.01	0.03
BSQL	剥蚀丘陵戈壁	7.56	45.93	45.46	1.01	0.01	0.03
NLW	尼龙网方格沙障措施	0.02	19.68	71.21	8.40	0.26	0.43
LZHM	砾质荒漠	4.15	29.28	56.96	7.49	0.24	1.88
SS	梭梭林措施	3.88	50.46	41.38	3.63	0.13	0.52

编号	土样采集地区	平均粒径（MZ）	分选系数（σ）	偏度（SK）	峰态（KG）
LDSQ	流动沙丘	2.063	0.712	0.244	3.359
NLW+SS	尼龙网方格+梭梭措施	2.569	1.374	-0.138	1.372
BSQL	剥蚀丘陵戈壁	0.953	3.745	0.357	2.135
NLW	梭梭林措施	3.572	2.003	0.197	1.757
LZHM	砾质荒漠	1.079	2.627	0.207	2.957
SS	尼龙网方格沙障措施	2.311	2.151	0.217	2.679

编号	组分	高度/cm	拟合方程	R²	编号	组分	高度/cm	拟合方程	R²
LDSQ	粉砂	0~100	y=0.0084x-0.0497	0.7882	BSQ	中砂	0~100	y=-0.1968x+54.476	0.8059
	极细砂	0~100	y=0.1592x+21.374	0.819	BSQ	粗砂	0~10	y=-0.282x+2.955	0.9291
	细砂	0~20	y=0.7564x+11.033	0.8228	NLW	黏粒	0~100	y=0.1454x+0.2465	0.7482
		20~40	y=-0.3898x+22.485	0.8592		极细砂	0~30	y=-0.6239x+53.155	0.7308
		40~100	y=0.3685x-8.2935	0.8597		细砂	0~30	y=0.6272x+4.774	0.7192
	中砂	0~100	y=-0.2424x+57.268	0.9105	SS	粉砂	0~30	y=0.0239x+0.172	0.8826
	粗砂	0~10	y=-0.9347x+12.788	0.8477		细砂	0~100	y=0.1513x+12.428	0.7299
		10~40	y=0.4146x-0.6181	0.8968		粗砂	0~10	y=-0.005x+0.074	0.8929
		40~100	y=-0.2295x+24.253	0.9124		粗砂	10~30	y=0.0053x-0.0261	0.9602
LZHM	细砂	0~10	y=1.7097x+7.632	0.9146	NLW+SS	黏粒	0~100	y=0.0283x+0.2702	0.7001
	细砂	40~100	y=0.1966x+4.4669	0.9963			40~50	y=0.09x-2.008	0.8293
	中砂	0~10	y=-2.4307x+42.623	0.8229			50~100	y=0.0098x+1.588	0.8414
BSQ	黏粒	0~100	y=0.0298x-0.1838	0.8664		细砂	0~10	y=1.4025x+10.557	0.7403
		0~50	y=0.0386x-0.3931	0.8734			10~20	y=-1.2811x+37.325	0.7488
		50~100	y=0.0063x+1.5129	0.9344			20~100	y=0.0532x+3.9605	0.725
	粉砂	0~100	y=0.0234x+0.1862	0.8455		中砂	0~10	y=-2.2855x+39.895	0.7138
	极细砂	0~100	y=0.1096x+42.213	0.7049		中砂	10~20	y=3.14x-18.769	0.9417
	细砂	0~100	y=0.0389x+2.1763	0.7235

Grain size characteristics of wind-blown sand transport on several underlying surfaces under strong wind conditions in Inner Mongolia section of Ejina-Hami Railway

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