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我县地处钱塘江口,杭州湾南岸,原有老南沙海塘(支堤)80.5公里。20多年来先后围垦海涂46.6万亩,新筑海塘180.3公里。由于海塘地处钱塘江口喇叭形地段,面临东海(见图1),水面宽广,常受台风和涌潮正面袭击,水深、潮大、浪高,加之受山洪的影响,塘身与河床为粉砂土质,易发生渗漏、液化和流失等原因,江道主槽摆动不定,对海塘威胁十分
My county is located in Qiantang River estuary, south bank of Hangzhou Bay, the original old Nansha seawall (embankment) 80.5 kilometers. Over the past 20 years, there have been reclamation of 466,000 mu of sea-to-sea and 180.3 kilometers of new seawalls. As the sea chestnuts are located in the flare-shaped section of the Qiantang River estuary facing the East China Sea (see Figure 1), the water surface is broad and often attacked by typhoons and tidal surges. The water depth, tide and wave height are affected by flash floods. Sand soil, prone to leakage, liquefaction and loss and other reasons, the main channel of the Yangtze River swing unsteadily, the threat to the sea is very