摘要
农业土壤受发育过程和长期耕作的影响,具有明显的分层性.考虑到耕作层与非耕作层在土壤物理性质上的差异.用Saint-Venant方程和改进后的Green-Ampt下渗模型联立,对成层土上的畦灌非恒定流方程进行数值模拟.计算结果与实测资料吻合较好,可在此基础上确定灌水技术参数的合理组合,为灌区实行分区水管理提供依据.
Agricultural soil, affected by long time cultivation and developing processes, is divided into topsoil and subsoil. Considering the difference in physical properties between different layers of soil, a mathematical model of unsteady flow in border irrigation is constructed by means of Saint-Venant model combined with the improved Green-Ampt infiltration model. The numerical solution is in good agreement with field observation. On this basis the optimum combination of technical parameters can be determined for border irrigation. The results of the study provide a basis for water management for irrigation districts.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
1993年第3期59-65,共7页
Journal of Hohai University(Natural Sciences)
关键词
成层土
畦灌
非恒定流
数值模拟
layered soils
border irrigation
unsteady flow
infiltration model
numerical simulation
