基于Hydrus-2D的果树涌泉灌溉环沟技术要素优化研究  

Optimization study on technical elements of circular ditch of fruit tree bubbler spring irrigation based on Hydrus-2D

作　　者：彭星凯 蔡守华[1] PENG Xingkai;CAI Shouhua(College of Water Conservancy Science and Engineering,Yangzhou University,Yangzhou 225100,China)

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225100

出　　处：《水科学与工程技术》2021年第6期9-15,共7页Water Sciences and Engineering Technology

摘　　要：为探寻涌泉灌条件下,土壤水分运移规律与环沟内径、入沟流量、灌水量及土质的关系,确定果树涌泉灌的最优环沟参数。本研究利用Hydrus-2D/3D软件对果树涌泉灌进行建模,再利用模型对不同环沟内径、入沟流量、灌水量及土质组合下的240种情形进行数值模拟,分析探究了各种要素对土壤水分运移及湿润体分布的影响。结果表明,环沟内径增大,湿润体范围减小,高含水量区增大,湿润体形状逐渐趋于椭圆形;入沟流量增大,湿润体范围减小,高含水量区增大;同一灌水量下,土壤渗透性越强,保水性越弱,湿润体越大,高含水量区越小。各种情形下最优环沟内径为20cm,而入沟流量则需要根据灌水量和环沟内径做出相应调整。In order to determine the optimal circular ditch parameters for fruit tree bubbler irrigation and explore the relationship between the law of soil water movement and the inner diameter of the circular ditch,the flow into the ditch,irrigation amount and the soil quality under the condition of bubbler irrigation.In this study,Hydrus-2D/3D software was used to model the fruit tree bubbler irrigation,and then the model was used to numerically simulate 240 cases under different inner diameter of the circular ditch,flow into the ditch,water content and soil combination,and the effects of various factors on soil water transport and distribution of wetting body were analyzed and explored.The results show that with the increase of the inner diameter of the circular ditch,the scope of the wetted body decreases,the high water content area increases,and the shape of the wetted body gradually tends to oval;with the increase of discharge into the ditch,the range of wet body decreases and the high water content area increases;under the same irrigation amount,the stronger the soil permeability,the weaker the water retention,the larger the wetting body and the smaller the high water content area.In all cases,the optimal inner diameter of the circular ditch is 20cm,and the inflow into the ditch needs to be adjusted according to the amount of irrigation and the inner diameter of the circular ditch.

关 键 词：涌泉灌 环沟 技术要素 灌溉水利用效率 

分 类 号：S275.9[农业科学—农业水土工程]