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一、地理概况和渍害成因 嘉兴市位于浙江省北部,属太湖流域杭嘉湖东部平原,地势平坦低洼,田面高程约3.5米(吴淞基面).境内河网密布,水源充足,河网率约占9.4％,多年平均水位2.8米.由于受河网水位影响,地下水位埋藏很浅,一般为0.2～0.4米.土壤以粘土为主,塑性指数19.5,容重1.25～1.30吨/米~3,总孔隙率52.3％左右.在春粮生育期间(11月
I. Geographic Survey and Causes of Waterlogging Jiaxing City is located in the northern part of Zhejiang Province and belongs to the plain of the east of Hangzhou-Jiaxing-Huzhou Lake in the Taihu Lake basin, with an elevation of about 3.5 meters (Wusong basal plane). 9.4%, the average water level for many years is 2.8 meters. Due to the influence of the water level of the river network, the groundwater level is very shallow, generally 0.2-0.4 meters. The clay is the main soil with a plasticity index of 19.5 and a weight of 1.25-1.30 tons / Porosity is about 52.3% .In the spring growing period (November