潮致地下水环流对黄河口外海含氮量的影响  

Influence of Tide Indunced Groundwater Circulation to Nitrogen Content of Open Oceans of the Yellow River Estuary

作　　者：孔俊[1] 刘建 宋志尧[3] 王万战[4] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]福建省环境科学研究院,福建福州350013 [3]南京师范大学,江苏南京210097 [4]黄河水利科学研究院,河南郑州450003

出　　处：《人民黄河》2010年第2期32-34,共3页Yellow River

基　　金：水文水资源与水利工程科学国家重点实验室开放基金资助项目(2007491211);水利部公益性行业科研专项(200901032);江苏省高校自然科学研究项目(09KJA170003)

摘　　要：近年来,渤海水质营养盐结构发生了显著变化,黄河口外海水质逐渐从高磷低氮向低磷高氮转变,特别是黄河口外无潮点海域水体无机氮含量较高。研究表明:由于无潮点海区沿海岸潮差分布差异比较明显,因此导致内陆一侧潜水层内地下水超高在空间分布上也存在显著差异,促使内陆地下水流从高潮差滨海区向低潮差滨海区运动,并促进内陆污染物迁移入海;靠近无潮点的海岸超高最小,成为地下水流的汇合入海处;随着近年来农村氮肥的大量使用,陆源污染有所加重,地下水中氮元素含量远高于地表水,在此类地下环流的长期作用下近岸海水中氮含量有所增高,由此导致局部海域水质逐渐由氮限制向磷限制方向演化。The structure of nutritive salt of Bohai Sea water quality has changed greatly in recent years.The water quality of open oceans of the Yellow River estuary is changed gradually from high phosphorus low nitrogen to low phosphorus high nitrogen;especially the content of inorganic nitrogen of amphidromic point of open seas area of the Yellow River estuary is higher.The study shows that a)due to obvious distribution difference of tidal range of the amphidromic point of the sea area,it results in surcharge of groundwater in water-table aquifer on inland side and remarkable difference existed in spatial distribution,impelling the movement of inland ground flow from high tidal range of coastal area to low tidal range of coastal area and promoting inland pollutants moving into the sea;b)the freeboard of seacoast close to amphidromic point is the minimum,becoming confluence and sea outfall of underground flow;c)owing to heavy use of nitrogenous fertilizer in rural areas in recent years,land-based source of pollution has somewhat increased,the content of nitrogen element of groundwater is much higher than that of surface water,the content of nitrogen of offshore water has somewhat increased under the long-term action of such groundwater circulation,resulting in the development of water quality of local sea area from nitrogen limit to phosphorus limit.

关 键 词：营养盐 地下环流 无潮点 渤海 黄河口 

分 类 号：TV148[水利工程—水力学及河流动力学]