基于GEE的黄河口表层悬浮泥沙浓度时空分布及其影响因素分析  

Analysis of the temporal and spatial distribution of suspended sediment concentration and its influencing factors in the Huanghe River Estuary based on GEE

作　　者：李慧真 王雨辰 段高雨 黄珏 Li Huizhen;Wang Yuchen;Duan Gaoyu;Huang Jue(College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学测绘与空间信息学院,山东青岛266590

出　　处：《海洋学报》2023年第8期178-190,共13页

基　　金：国家自然科学基金(42076185,41706194);山东科技大学科研创新团队支持计划(2019TDJH103)。

摘　　要：黄河三角洲作为我国重要的生态功能区,探究入海口处表层悬浮泥沙浓度(Suspended Sedi-ment Concentration,SSC)分布及其影响因素对沉积物侵蚀再悬浮、河口海岸带生态过程等具有指导意义。本文基于色度角与SSC之间的关系建立了适于黄河口及邻近海域的SSC反演模型(R2=0.80,MRE=11.0%,RMSE=1.35 mg/L)。借助GEE平台,研究得到2000-2021年黄河口及邻近海域SSC的时空分布特征和变化规律,并从自然和人类活动两方面进行影响因素分析。研究区年均SSC呈波动下降的趋势(-1.83mg/(L·a));空间分布表现为由近岸向远岸逐渐降低的趋势;扩散区间(年均SSC>20mg/L)仅在距离河口4.8~14.6 km之间,黄河入海泥沙对现行黄河口处泥沙扩散影响有限。波浪与悬浮泥沙浓度存在相同的季节特征,非调水调沙期间,有效波高与SSC年代际月均值呈现正相关关系(r=0.66,p<0.01);调水调沙期间,现行黄河口门以及莱州湾处SSC受风速、有效波高影响有限,调水调沙占主导地位。调水调沙期间的来沙系数与高浓度区面积变化率呈正相关的关系,调水调沙结束后(16 d内),高浓度区(SSC>200 mg/L)边界由距沿岸约1.3 km扩大至约2.5 km。The Huanghe River Delta is an important ecological function area in China.It is of guiding significance to explore the distribution of suspended sediment concentration(SSC)at the estuary and its influencing factors for sediment erosion and re-suspension,and the ecological process in the estuary and coastal zone.Based on the rela-tionship between chromaticity angle and SSC,an SSC inversion model(R2=0.80,MRE=11.0%,RMSE=1.35 mg/L)suitable for the Huanghe River Estuary and its adjacent sea areas is established in this paper.With the help of the GEE(Google Earth Engine)platform,the spatial and temporal distribution characteristics and changing rules of SSC in the Huanghe River Estuary and its adjacent sea area during the 22 years from 2000 to 2021 were studied,and the influencing factors were analyzed from two aspects of nature and human activities.The annual average value of SSC in the study area showed a downward trend(-1.83 mg/(L·a)).The spatial distribution shows that SSC gradually decreases from near shore to far shore;the diffusion interval(SSC>20 mg/(L·a))is only 4.8-14.6 km away from the estuary,and the influence of sediment from the Yellow River on the current sediment diffusion at the estuary is limited.The wave and suspended sediment concentration have the same seasonal characteristics.During the non-water and sediment regulation period,there is a positive correlation between the effective wave height and the SSC interdecadal monthly average(r=0.66,p<0.01).During the period of water and sediment regulation,the current SSC at the mouth of the Huanghe River and Laizhou Bay is limited by wind speed and effective wave height,and water and sediment regulation is dominant.During the period of water and sediment regulation,there is a positive correlation between the incoming sediment coefficient and the area change rate of high-concentration areas.After the water and sediment regulation(within 16 days),the boundary of the high concentration area(SSC>200 mg/L)is expanded from about 1.3 km to about 2.5 km from the

关 键 词：GEE(Google Earth Engine)平台 色度角 黄河口及邻近海域 悬浮泥沙浓度 调水调沙 

分 类 号：X87[环境科学与工程—环境工程] P734.231[天文地球—海洋化学]