风浪扰动下南四湖悬浮颗粒物分布与侵蚀深度模拟

doi:10.16843/j.sswc.2022.02.002

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Abstract [Background] Distribution and sedimentation of suspended solids during sediment resuspension and settlement process in rivers and lakes under different winds and waves disturbance are of great significance for regional water and soil conservation and environmental protection. It is particularly important to simulate the sediment resuspension and settlement process of Nansi lake in Shandong province, the most important shipping section of the Beijing-Hangzhou Grand Canal, which is frequently disturbed by wind-waves and ships. [Methods] In order to study the dynamic distribution of suspended solids and the erosion depth of surface sediment during the process of sediment resuspension and settlement, taking Nanyang lake area of Nansi lake as research object, on the basis of local wind statistics, Y-shape apparatus was used to simulate sediment resuspension and sedimentation process under common wind conditions, and dynamic distribution of suspended solids and physical erosion depth at estuary and lake center area were studied respectively under different winds and waves in summer and winter. [Results] 1) According to analyzed wind statistics from October 2012 to September 2013 of Nanyang lake, the annual maximum wind speed was 9.1 m/s, the average wind speed was 2.1 m/s, and the low wind speed from 0-1.0 m/s was very much, accounting for 38.9% of the whole year, the high wind speed above 6 m/s was relatively small, only accounting for 2.4% of the whole year. 2) The maximum suspended solids increment in the lake center area was 35.8%, 25.0%, 47.1% and 54.2%, 74.1%, 22.7% higher than that of estuary in summer and winter under slight, moderate and strong winds, respectively. The maximum suspended solids increment in the lake center and estuary area in summer was 62.2% and 22.6% higher than that in winter under strong wind conditions. 3) The amount of suspended solids decreased more than 85% under different wind speeds in first 6 h of settlement, and after 20 h sedimentation, the concentration of suspended solids in water column tended to be consistent with the initial concentration before the disturbance. 4) The surface sediment erosion depth was 0.09-13.73 mm under different winds and waves disturbance in Nanyang lake. [Conclusions] The sediment resuspension regularities in Nanyang lake were significantly different with spatial and seasonal level, the differences were caused by different size of surface sediment particles at the estuary and lake center area and large acreages of Nanyang lake were covered by Potamogeton crispus, which reduce the amount of suspended solids. Settlement simulation process demonstrated that the first 6 h of settlement was critical for lower particulate matter in Nanyang lake. It was very difficult to erode surface sediments on the scale of decimeter or even centimeter under conventional wind conditions in Nanyang lake area of Nansi lake.

Key words： resuspension process sedimentation process distribution of sediment solids erosion depth wind and wave disturbance Nansi lake

Received: 09 November 2020

PACS:

X524

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	LI Bao
	SHEN Qiushi
	SUN Chunyi
	HE Guosheng
	LIU Yang

Cite this article:

LI Bao,SHEN Qiushi,SUN Chunyi, et al. Simulation of suspended solids distribution and erosion depth under winds and waves disturbance in Nansi lake, China[J]. SSWC, 2022, 20(2): 7-14.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2022.02.002 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2022/V20/I2/7

[1]	李大鹏,黄勇,李勇,等.沉积物扰动持续时间对悬浮物中磷形态数量分布的影响[J].环境科学, 2012, 33(2):379. LI Dapeng, HUANG Yong, LI Yong, et al. Impacts of sediment disturbance time on the distribution of phosphorus forms in suspended solids[J]. Environmental Science, 2012, 33(2):379.
[2]	范成新,张路,秦伯强,等.风浪作用下太湖悬浮态颗粒物中磷的动态释放估算[J].中国科学(D), 2003, 33(8):760. FAN Chengxin, ZHANG Lu, QIN Boqiang, et al. Estimation of phosphorus release from suspended particulate matter in under wind waves Taihu Lake[J]. Science China (D), 2003, 33(8):760.
[3]	胡春华,胡维平,张发兵,等.太湖沉积物再悬浮观测[J].科学通报, 2005, 50(22):2541. HU Chunhua, HU Weiping, ZHANG Fabing, et al. Observation of sediment resuspension in Taihu Lake[J]. Chinese Science Bulletin, 2005, 50(22):2541.
[4]	申霞,洪大林,丁艳青,等.太湖疏浚前后波浪扰动下的底泥再悬浮特征[J].水科学进展, 2011, 22(4):580. SHEN Xia, HONG Dalin, DING Yanqing, et al.Sediment resuspension characteristics under wave distributing of dredging in Taihu Lake[J]. Advances in Water Science, 2011, 22(4):580.
[5]	张运林,秦伯强,陈伟民,等.太湖水体中悬浮物研究[J].长江流域资源与环境, 2004, 13(3):266. ZHANG Yunlin, QIN Boqiang, CHEN Weimin, et al.A study on total suspended matter in Lake Taihu[J]. Resources and environment in the Yangtze Bain, 2004, 13(3):266.
[6]	尤本胜,王同成,范成新,等.太湖沉积物再悬浮模拟方法[J].湖泊科学, 2007, 19(5):611. YOU Bensheng, WANG Tongcheng, FAN Chengxin, et al. Quantitative simulative method of sediment resuspension in Lake Taihu[J]. Journal of Lake Sciences, 2007, 19(5):611.
[7]	范成新.旋浆式沉积物再悬浮发生装置:CN 200420025427.9[P]. 2004-09-27. FAN Chengxin. Y-type sediment resuspension apparatus:CN 200420025427.9[P]. 2004-09-27.
[8]	尤本胜.太湖沉积物再悬浮和沉降过程中物质的动态迁移及其定量化[D].南京:中国科学院南京地理与湖泊研究所, 2007:11. YOU Bensheng. Dynamic transfer of nutrients and their quantification in sediment resuspension and sedimentation processes in Lake Taihu[D]. Nanjing:Nanjing Institute of Geography and Limnology Chinese Academy of Sciences, 2007:11.
[9]	张智慧,李宝,梁仁君.南四湖南阳湖区河口与湖心沉积物重金属形态对比研究[J].环境科学学报, 2015, 35(5):1408. ZHANG Zhihui, LI Bao, LIANG Renjun. Comparison of sediment heavy metal fractions at estuary and center of Nanyang zone from Nansi Lake, China[J]. Acta Scientiae Circumstantiae, 2015, 35(5):1408.
[10]	刘新,王秀,赵珍,等.风浪扰动对底泥内源磷钝化效果的影响[J].中国环境科学, 2017, 37(8):3064. LIU Xin, WANG Xiu, ZHAO Zhen, et al. Effect of wind and wave disturbance on passivation of internal phosphorus in sediment[J].China Environmental Science, 2017, 37(8):3064.
[11]	MELZER A. Aquatic macrophytes as tools for lake management[J]. Hydrobiologia, 1999, 395:181.
[12]	YOU B S, ZHONG J C, FAN C X, et al. Effects of hydrodynamics processes on phosphorus fluxes from sediment in large, shallow Taihu Lake[J]. Journal of Environmental Sciences (China), 2007, 19:1055.