上海马桥地区全新世中晚期气候变化、海面变化和古洪水

MIDDLE AND LATE HOLOCENE CLIMATIC CHANGES AND SEA LEVEL CHANGES AND PALEO-FLOODS OF MAQIAO, SHANGHAI

研究了上海马桥遗址,分析气候变化、海面变化对古洪水的影响和控制作用。整个马桥遗址剖面有3个文化断层:良渚文化层之下、马桥文化层下部与良渚文化层之间,唐宋文化层与马桥文化层之间,代表了3个洪水泛滥和海侵过程。第1次洪水发生在 6150aB.P.与4 400a B.P.之间,此时气候温暖湿润,海面为最高海面;第2次洪水发生在 3 900—3 250aB.P.期间,气温较高且为高海面;马桥文化后的第3次洪水期（2450—2000aB.P.）,气候干凉且为低海面。

The Yangtze Delta is a frequent flood area. By study on Maqiao site in Shanghai, the authors researched on the influ-encence of climate and sea level changes on floods. There were three cultural interruptions. The first was under Liangzhu culture layer, the second was between Liangzhu and Maqiao culture layers and the last was on the Maqiao culture layer. They reflected three-floods and sea transgression processes. The first flood occurred from 6150 a B.P. to 4 400 a B. P. with the highest sea level and warm and humid climate. The second flood took place from 3 900 a B.P. to 3 250 a B.P. with warm climate and high sea level. The last flood happened during 2 450 a B.P. to 2 000 a B.P with dry and cold climate and low sea level.