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分布式水文模型为变化环境下灌区水循环演变的研究提供了有效手段,为了将SWAT模型运用于关中平原灌区水循环研究,以泾惠渠灌区为例,利用HWSD土壤数据、SPAW软件及统计分析法,构建了灌区土壤数据库;基于遥感数据获得了灌区2014年的土地利用情况,构建了土地利用数据库;充分考虑灌区水系、渠系分布(无排水沟)、人工侧支循环的逆汇流特性及输配水管理特点,利用ArcGIS自定义了SWAT的河网水系及子区,并通过pre-defined操作导入模型,将灌区划分为52个子区,分别设置了合理的土壤类型及土地利用类型的面积阈值,将研究区划分为279个HRUs,构建了灌区空间离散数据库。SWAT模型基础数据库的构建为灌区SWAT模型的构建及水循环演变规律的研究奠定了基础。
In order to apply SWAT model to the study of water cycle in irrigation area of Guanzhong Plain, taking the Jinghuiqu Irrigation District as an example, using HWSD soil data, SPAW software and statistical analysis method, the distributed hydrological model is provided as an effective method to study the evolution of water cycle in irrigation district under changing environment. Based on the remote sensing data, the land use situation of the irrigation area in 2014 was obtained and the land use database was constructed. The water system, distribution of canal system (without drainage ditches), the inverse conflux characteristics of artificial collateral circulation, The characteristics of water management, the SWAT river network and sub-area were defined by ArcGIS, and the model was imported by pre-defined operation. The irrigation area was divided into 52 sub-areas, and the reasonable soil type and land-use area threshold were set respectively. The study area is divided into 279 HRUs, and a spatial discrete database of irrigation districts is constructed. The construction of SWAT model database has laid the foundation for the construction of SWAT model and the study of water cycle evolution law.