Spatio-temporal variation of suspended sediment and its dynamic factors in Liaohe Estuary

doi:10.3969/j.issn.1001-909X.2024.01.004

Abstract

Abstract:

Based on the L2B sediment data of HY-1C CZI from 2019 to 2020 and the meteorological and hydrological data of the same period, spatial analysis and statistical methods were applied to analyze the spatio-temporal variation characteristics and dynamic factors of suspended sediment mass concentration in the sea area of Liaohe Estuary. The results show that tide is the dominant factor in the diurnal variation of suspended sediment, and the average suspended sediment mass concentration at ebb period is higher than that at flood period. The influence of runoff on suspended sediment mass concentration in the Liaohe Estuary is mainly in the shore area, and generally does not exceed 5 m isobath. When the flow direction of ebb current is opposite to the wind direction, the turbidity zone expands horizontally in the estuary, while when the flow direction of ebb current is the same as the wind direction, the turbidity zone contracts at the top of the estuary. There is a significant correlation between wind speed and suspended sediment mass concentration, and the closer to the offshore, the stronger the effect of wind on suspended sediment. Under the influence of tidal currents, runoff and wind waves, the inner part of the 8 m contour usually develops into the maximum turbidity zone.

Key words: HY-1C CZI, Liaohe Estuary, suspended sediment, spatio-temporal variations, dynamical factors

CLC Number:

P737.1

ZHAO Xuekai, GUO Kaiyuan, ZHOU Yunhao, JIA Liyuan, YANG Zhibo, ZHANG Qinxu, ZHANG Mingliang. Spatio-temporal variation of suspended sediment and its dynamic factors in Liaohe Estuary[J]. Journal of Marine Sciences, 2024, 42(1): 36-46.

Figures/Tables 13

Fig.1 Geographical location of the study area

Fig.2 Comparison of measured suspended sediment mass concentration and HY-1C CZI sediment data

Tab.1 Tide and wind conditions at the imaging time

成像时间	潮型	潮时	潮高/cm	风速/(m·s^-1)	风向
2019-03-22	大潮	落潮起6.37 h	66	5.09	SW
2019-03-31	小潮	涨潮起3.78 h	207	5.96	NW
2019-04-06	大潮	落潮起5.00 h	86	3.43	ENE
2019-04-12	小潮	落潮起2.00 h	225	5.99	SW
2019-04-15	小潮	涨潮起3.38 h	198	7.36	SW
2019-04-21	大潮	落潮起5.30 h	77	3.19	NE
2019-06-23	中潮	落潮起1.83 h	258	3.98	NE
2019-08-16	大潮	落潮起5.00 h	90	2.50	WNW
2019-08-31	大潮	落潮起5.52 h	65	3.47	SSW
2019-10-12	中潮	落潮起6.83 h	47	5.38	NNE
2020-07-11	中潮	落潮起2.00 h	258	2.25	SW
2020-10-15	中潮	涨潮起0.70 h	57	4.74	SW
2020-10-24	小潮	涨潮起6.67 h	371	3.39	S
2020-10-27	小潮	涨潮起2.23 h	185	1.82	ESE
2020-10-30	中潮	落潮起6.58 h	47	3.17	S

Fig.3 Distribution map of SSC from October 15 to 30, 2020

Fig.4 Comparison of SSC at different flood and ebb times at L1 section of Liaohe Estuary

Fig.5 Comparison of average SSC between spring and neap tides, flood and ebb tides at L1 section

Fig.6 Comparison of SSC in the study area in different periods

Fig.7 Comparison of SSC under different runoff conditions

Fig.8 Variations of SSC in the Liaohe Estuary from March to November (The vertical line represents the L1 profile.)

Fig.9 Monthly mean value of wind speed and SSC at L1 section

Fig.10 Correlation between wind speed and SSC at L1 section

Fig.11 Time variation of wind speed and SSC at S1 station

Fig.12 Comparison of turbidity zone and dynamic field in different periods

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