2025钱塘江涌潮科考成果发布|天天综合网网欲色

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  中新网嘉兴10月7日电(鲍梦妮)10月7日,由浙江省钱塘江管理局、浙江省水利河口研究院、中共海宁市委宣传部共同举办的“2025钱塘江涌潮科考”新闻发布会在嘉兴海宁举行。

发布会现场。 海宁市传媒中心供图

  “2025钱塘江涌潮科考”全线考察在钱塘江南北两岸共设置23个点位,共有近100名队员参与其中,主要来自水利部门、科研机构、相关高校以及沿江中小学等。

  据发布会消息,本次科考通过对钱塘江涌潮景观特点分析,发现南岸起潮点已经下移到余姚陶家路闸以东5公里一带,受局部地形影响,南股槽的涨潮流形成了三股一线潮;海宁尖山段地形复杂多变,滩地涨淤频繁,由此形成丰富的涌潮景观,本年度科考在新仓发现多种潮型同时出现,呈现“一镜多潮”的画面,充分展现了尖山河段复杂多变的滩地形态和涌潮变化形态。同时,科考发现,自海宁大缺口以上河段至富阳悬空沙一带,整个江段可能都有暗潮产生,时间在涌潮过后5-30分钟内,由于受地形、岸线等因素影响,传播速度不同,有时可能在60分钟内都有暗潮发生。

  本次科考重点观测海宁尖山河段变化复杂的滩地形态。海宁尖山河段江道宽广、岸线弯曲、河床抬升,在嘉绍大桥、塔山坝、廿工段等涨落潮动力隐蔽区发育的广阔潮滩,是潮汐树生长的良好区域。

  此外,科考团队通过对潮汐树的年际规律分析发现,近十年来,尖山潮滩在年尺度上大体维持了年初“上年末扩大—年中减小—年末扩大”的动态变化。

  本次科考对海宁尖山与杭州下沙两片区域的潮滩进行分析对比潮汐树生成规律及演变趋势。研究发现,两地均有一定规模的潮滩,但海宁大缺口潮差是下沙的2倍多,涌潮高度是下沙2倍,大缺口的动力条件强于下沙,潮汐“画笔”更为有力;大缺口的低潮位低于潮滩3.4米,而下沙的低潮位仅低于潮滩0.4米,落潮时,海宁潮滩退潮水流的水头更大,潮汐“作画”时间更长。

  本次科考还对钱塘区廿工段附近潮汐树进行了为期九天的观测,科考发现了潮汐树地貌对潮汐周期的敏感响应。钱塘江潮汐树不同于其他地方,钱塘江动力强,泥沙丰富,河床质松散,潮汐树具有生长发育快、形态丰富多变特点。(完)

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发布于:北京市