基于SIRMOD的畦灌质量评价及其技术要素优化

为了提高畦灌的水分利用效率和粮食产量,进行了畦灌灌水质量评价指标对不同灌水技术要素组合响应规律的模拟研究。选取2009年杨凌渭河北岸河漫滩地的沙壤土和黏壤土畦灌田间实测数据,基于SIRMOD模型求出畦田平均入渗参数,然后通过多组合灌溉模拟分别计算出灌水效率和灌水均匀度。结果表明:畦田规格和单宽流量对灌水效率和灌水均匀度有明显的影响,在一定条件下,随着畦长的增长和单宽流量的减小,灌水效率和灌水均匀度均减小。建议该地区沙壤土畦长为40～50 m时单宽流量为6.0～8.0 L/(s.m),黏壤土畦长为60～70 m时单宽流量为5.0～7.0L/(s.m),畦宽均以1～3 m为宜。

Analysis of Border Irrigation Efficiency Based on SIRMOD and Optimal of Irrigation Technology Elements

In order to improve the water use efficiency and food production of border irrigation,it carried out the simulation research on the response law of the irrigation quality evaluation indexes of the border irrigation to the combination with different elements.Using measured border irrigation data which received from the sandy loam and clay loam on the north flood land in WeiHe River in 2009,based on the SIRMOD model estimate the average of border irrigation infiltration parameters,then through a multi-combination simulation calculated the application efficiency and distribution uniformity.The results show that sizes of borders and flow rate of unit width have significant impact to application efficiency and distribution Uniformity,in a certain condition,with the increasing of the length and decreasing of flow rate of unit width,application efficiency and distribution uniformity are reduced.Suggest the proposed length of sandy loam should be 40-50 m,flow rate of unit width should be 6.0-8.0 L/(s·m);the length of clay loam should be 60-70 m,flow rate of unit width should be 5.0-7.0 L/(s·m) and the appropriate farmland’s wide is 1-3 m.