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唐代山会平原东部的东江塘构建改变了平原内河东出水流环境,平原积水向北部汇聚,后凿玉山置朱储斗门以泄水;北宋将斗门扩建为玉山闸,使北部灌溉能力极大提升,平原对鉴湖蓄水灌溉依赖减弱。南宋山阴北海塘最终构筑,西小江东出河道逐步固定,平原北部形成新的积水区,一些范围较大的积水区后期发育成湖泊,也分担鉴湖灌溉功能。北宋以后湖田化最终导致以鉴湖为中心的斗门水利系统废弃,湖水排入内河,原鉴湖低地积水,则通过堰来维持湖田区的农田灌溉及航运。唐宋海塘构建引起的水文生态变化推动着水利系统演变。
The construction of Dongjiangtang in the eastern part of the Sanhui Plain in the Tang Dynasty changed the water environment of the rivers east of the Plain, the convergence of the plain water to the north, and the installation of the Zhu Shu Dou door to cut off water from the Yushan. The Northern Song dynasty expanded the Doumen into the Yushan Gate, greatly boosting the irrigation capacity in the north , The plain relies on the lake water storage irrigation weakened. The Southern Song Dynasty San-hai Beihaitang eventually build, the West Xiaojiang East out of the river gradually fixed, the northern part of the plain to form a new water area, some larger water area later developed into lakes, also share Jianghu irrigation functions. After the Northern Song Dynasty, Hutianhua eventually led to the abandonment of the Doumen water conservancy system centered on Jianghu Lake. The lake was discharged into the inland river and the original Jianghu lowland water, then the weir was used to maintain farmland irrigation and shipping in the Hutian area. The hydrological and ecological changes caused by the Tang and Song hai ponds promote the evolution of the water conservancy system.