摘要
自1976年黄河尾闾改道以来,流往黄河三角洲北岸的刁口河段结束行水,海岸失去陆源泥沙补给后在海洋动力的作用下发生持续侵蚀,黄河三角洲北部自然保护区湿地生态资源面临威胁。为了解黄河三角洲北部自然保护区近几十年来水下地形的冲淤变化,并对未来侵蚀形势进行估计,根据黄河三角洲北岸实测水深资料,运用空间插值分析技术,计算各时期研究区水下地形并叠加分析。结合黄河利津站历史来水来沙资料的统计,尝试提出在新水沙形势下对黄河三角洲北岸的分沙补偿侵蚀定量方案。结果表明,1992-2015年,该区常年发生持续冲刷,年均侵蚀量为0.29×10^8 t,年均侵蚀厚度为0.14 m,侵蚀速率稳定。经计算,在干流水库调水调沙期间通过刁口河道以约1 200 m^3/s的流速持续引水19 d,可以有效缓解该自然保护区的侵蚀现状,具体的方案和工程实施仍需后续细化。
The northern coast of the Yellow River Delta has lost its sediment supply from the Yellow River basin and experienced continuous erosion under ocean power since the cut-off of Diaokou River in 1976. The ecological resources of wetland in the Yellow River Delta Northern Nature Reserve(YRDNNR), located at the mouth of the Diaokou River, are thus under threat. The erosion of YRDNNR was evaluated by using spatial analysis technique based on the topography data measured on the north bank of the Yellow River Delta in this paper. The results show that from year 1992 to 2015, continuous erosion occurred in this area, the annual erosion volume reached 2 856×10^4 t, the annual eroded thickness was 9.3 cm, and the erosion rate remained rather stable. Based on the historical runoff of Lijin hydrological station of the Yellow River, the paper tries to put forward a quantitative scheme to compensate the erosion in the YRDNNR. According to the analysis, during the period of water-sediment modulation, water diversion through Diaokou River at a flow rate of 1 200 m^3/s for 19 days can effectively alleviate the erosion of the reserve.
作者
黄安定
蒋雪中
陈沈良
HUANG Anding;JIANG Xuezhong;CHEN Shenliang(State Key Laboratory of Estuarine and Coast,East China Normal University,Shanghai 200241,China;School of Urban and Regional Science,East China Normal University,Shanghai 200241,China)
出处
《海洋地质前沿》
CSCD
2020年第12期15-21,共7页
Marine Geology Frontiers
基金
国家重点研发计划(2017YFC0405503)
国家自然科学基金(U1706214)。
关键词
黄河三角洲
海岸侵蚀
引沙治理
Yellow River Delta
coastal erosion
sediment replenishment
