基于倾斜摄影技术的戈壁灌丛沙丘形态反演及其对粉尘释放研究的意义

doi:10.7522/j.issn.1000-694X.2019.00078

摘要/Abstract

摘要： 灌丛沙丘是广泛分布于西北干旱区的风沙地貌。戈壁上发育的灌丛沙丘在戈壁沙尘释放和固沙能力方面具有重要的指示意义和应用价值。本研究采用倾斜摄影技术对戈壁上的灌丛沙丘形态特征进行观测和提取,并分析沉积物特征,计算戈壁灌丛沙丘的固沙能力,为沙尘释放研究提供依据。结果表明:(1)戈壁上发育的灌丛沙丘有明显的空间分布格局,即主要分布在干河床的两侧和地势低洼地区。(2)戈壁灌丛沙丘在形态上和其他地表灌丛沙丘类似,但沙丘的长度、宽度、底面积、体积等小得多,而且参数之间具有明显的相关关系。(3)沉积物的累积概率曲线表现为三段式,跃移组分的粒度范围(50~700 μm)明显与以往研究不同。沙丘内部和表层的粉沙和黏土含量分别为4.47%和5.24%,从而说明灌丛沙丘能够捕获戈壁上释放的粉尘物质。(4)戈壁地区单个灌丛沙丘的粉尘释放量约0.05~0.08 m³,固沙能力最大可达18.71 m³。

关键词: 无人机, 戈壁, 灌丛沙丘, 形态, 粉尘

Abstract: Nebkhas are one of main geomorphology, which are widely distributed in arid region. At present, nebkhas geomorphology patterns and its environmental significance in the sandy desert, agriculture land and oasis had been well researched. However, there are little research on the nebkha dunes in the gobi desert. The nebkhas in the gobi desert can be used as one of index for dust emission and sand fixing capacity. Therefore, the unmanned aerial vehicle and tilt camera were used to measure nebhka dunes morphology and sand fixing capacity in the gobi desert. (1) The research shows the nebkha dunes have an obvious spatial distribution patterns that almost all nebkha dunes are distributed on both sides of the gullies and low-lying areas. (2) The morphology of nebkha dunes on the gobi desert is similar as sandy desert, oasis and agriculture land, but the height, length, width, area and volume are smaller. Moreover, there is a clear correlation between the parameters. (3) The cumulative frequency curve of the sediments in the inner and over nebkha dunes shows a distinct three-stage: suspended component (particle size <63 μm), saltation component (63-500 μm) and creep component (>500 μm). The particle size range of the saltation components (50-700 μm) is significantly different from previous studies, which reflects the difference of sand supply and sediment transport type. Silt and clay is about 5% in the inner and over the nebkha dunes, which indicats it is come from dust emission in the Gobi desert. (4) According to the content of the silt and clay, we can derive that the dust emission quantity of single nebkha in the gobi desert is 0.05-0.08 m³, and sand fixing capability can reach to 18.71 m³.

Key words: unmanned aerial vehicle, gobi desert, nebkha dune, morphology, dust

中图分类号:

P931.3

潘凯佳, 张正偲, 梁爱民, 董治宝, 李兴财. 基于倾斜摄影技术的戈壁灌丛沙丘形态反演及其对粉尘释放研究的意义[J]. 中国沙漠, 2020, 40(2): 24-32.

Pan Kaijia, Zhang Zhengcai, Liang Aimin, Dong Zhibao, Li Xingcai. Nebkhas geomorphology in the gobi desert using the unmanned aerial vehicle and tilt camera[J]. Journal of Desert Research, 2020, 40(2): 24-32.

参考文献

[1] Nickling W G,Wolfe S A.The morphology and origin of nabkhas,region of Mopti,Mali,West Africa[J].Journal of Arid Environments,1994,28:13-30.
[2] Parsons A J,Wainwright J,Schlesinger W H,et al.The role of overland flow in sediment and nitrogen budgets of mesquite dunefields,southern New Mexico[J].Journal of Arid Environments,2003,53:61-71.
[3] 朱震达,陈广庭.中国土地沙质荒漠化[M].北京:科学出版社,1994:24.
[4] 王涛.中国沙漠与沙漠化[M].石家庄:河北科技出版社,2003.
[5] 王乐,李改欣,王仁德,等.半干旱区农田灌丛沙堆形态及沉积特征[J].水土保持研究,2014,21(1):76-80.
[6] 穆桂金.塔克拉玛干沙漠灌草丛的发育特征及其环境意义[J].干旱区研究,1995(增刊):31-37.
[7] 王仁德,常春平,彭帅,等.基于粒度对比法的坝上农田风蚀与粉尘释放量估算[J].农业工程学报,2013,29(21):108-114.
[8] Li J R,Ravi S.Interactions among hydrological-aeolian processes and vegetation determine grain-size distribution of sediments in a semi-arid coppice dune (nebkha) system[J].Journal of Arid Environments,2018,154:24-33.
[9] Zou X Y,Li J F,Liu B,et al.The protective effects of nebkhas on an oasis[J].Aeolian Research,2016,20:71-79.
[10] Yang Y Y,Liu L Y,Shi P J,et al.Morphology,spatial pattern and sediment of Nitraria tangutorum nebkhas in barchans interdune areas at the southeast margin of the Badain Jaran Desert,China[J].Geomorphology,2015,232:182-192.
[11] Wang X M,Wang T,Dong Z B,et al.Nebkhas development and its significance to wind erosion and land degradation in semi-arid northern China[J].Journal of Arid Environments,2006,65:129-141.
[12] Wang X M,Zhang C X,Zhang J W,et al.Nebkha formation:implications for reconstructing environmental changes over the past several centuries in the Ala Shan Plateau,China[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2010,297:697-706.
[13] Tengberg A.Nebkha dunes as indicators of wind erosion and land degradation in the Sahel zone of Burklina Faso[J].Journal of Arid Environments,1995,30:265-282.
[14] Gillies J A,Nield J M,Nickling W G.Wind speed and sediment transport recovery in the lee of a vegetated and denuded nebkha within a nebkha dune eld[J].Aeolian Research,2014,12:135-141.
[15] Hesp P A.The formation of shadow dunes[J].Journal of Sedimentology Research,1981,51:101-111.
[16] Hesp P A,Smyth T A G.Nebkha ow dynamics and shadow dune formation[J].Geomorphology,2017,282:27-38.
[17] Dong Z B,Luo W Y,Qian G Q,et al.A wind tunnel simulation of the mean velocity fields behind upright porous fences[J].Agricultural and Forest Meteorology,2007,146:82-93.
[18] 张正偲,董治宝,赵爱国.人工模拟戈壁风沙流与风程效应观测[J].中国科学(地球科学),2011,41(10):1505-1510.
[19] 董治宝,苏志珠,钱广强,等.库姆塔格沙漠风沙地貌[M].北京:科学出版社,2011.
[20] Zhang Z C,Dong Z B,Hu G Y,et al.Migration and morphology of asymmetric barchans in the central Hexi Corridor of Northwest China[J].Geosciences,2018,8:204.
[21] 李鹏,林杰,李欢.空地一体化地形测量[J].测绘通报,2018(2):160-163.
[22] 张久龙,李淑梅,李利群,等.无人机航测系统在农村1∶500地籍测图中的应用探讨[J].测绘地理信息,2017,42(1):69-72.
[23] Folk R L,Ward W C.Brazos River bar:a study in the significance of grain size parameters[J].Journal of Sedimentary Petrology,1957,27:3-26.
[24] 刘冰,赵文智,杨荣.荒漠绿洲过渡带柽柳灌丛沙堆特征及其空间异质性[J].生态学报,2008,28(4):1446-1455.
[25] 高永,党晓宏,虞毅,等.乌兰布和沙漠东南缘白沙蒿(Artemisia sphaerocphala)灌丛沙堆形态特征与固沙能力[J].中国沙漠,2015,35(1):1-7.
[26] 张进虎,唐进年,李得禄,等.民勤荒漠绿洲过渡带灌丛沙堆形态特征及分布格局[J].中国沙漠,2015,35(5):1141-1149.
[27] 张萍,哈斯,岳兴玲,等.白刺灌丛沙堆形态与沉积特征[J].干旱区地理,2008,31(6):926-932.
[28] 左合君,杨阳,张宏飞,等.阿拉善戈壁区白刺灌丛沙堆形态特征研究[J].水土保持研究,2018,25(1):263-269.
[29] 柳媛普,李耀辉,王胜,等.河西走廊中段干旱荒漠区土壤水热状况初步分析[J].干旱区资源与环境,2011,25(5):204-208.
[30] Zhang Z C,Dong Z B,Qian G Q,et al.Implications of surface properties for dust emission from gravel deserts (gobis) in the Hexi Corridor[J].Geoderma,2016,268:69-77.
[31] 左忠,潘占兵,张安东,等.干旱风沙区农田防护林网空间风速与地表风蚀特征[J].农业工程学报,2018,34(2):135-141.
[32] 孟小楠,严平,王振亭,等.车辆碾压作用下戈壁地表起尘浓度[J].中国沙漠,2019,39(1):80-87.