滨海盐土暗管排水降渍脱盐效果研究

在江苏省滨海盐土按不同埋深和间距埋设地下暗管,其降渍、脱盐作用主要表现在丰水期(7-9月)内,在试验区范围内,10m间距暗管的降渍效果最显著,10m和15m间距暗管的脱盐效果相差不明显；在较小间距(10m)时,1.4m埋深暗管的降溃效果优于1.2 m埋深,埋设间距≥15m后,埋深对暗管降渍效果无明显影响,而在所有埋设间距处理中,1.4m埋深暗管的脱盐效果都优于1.2m埋深.综合比较分析各相关试验结果,并考虑暗管埋设的初期投资和后期维护成本,推荐间距15m、埋深1.4m为江苏滨海盐土降渍脱盐的地下暗管工程最佳布设参数.

Effects of subsurface pipe drainage on waterlogging controlling and desalination in coastal saline soil

Subsurface drainage plastic pipes were buried in typical coastal saline soil plots in Jiangsu Province with designed 1.2 m and 1.4 m depths and 10 m,15 m and 20 m intervals.The effects of subsurface pipe drainage on groundwater depth controlling and desalination were mainly detected in the flooding season(from July to September).The groundwater depth was significantly reduced by subsurface pipes buried with 10 m interval.There was no significant difference between the treatments with 15 m and 10 m intervals.The effect of subsurface pipes buried with 1.4 m depth was better than 1.2 m depth with the 10 cm interval,but no significant difference was found between the effects of different buried depths with the buried interval ≥15 m.The effects of subsurface pipe with 1.4 m depth on desalination were more obvious than 1.2 m depths.Based on synthetical estimating the experimental results and constructing and maintaining costs,subsurface pipes buried with 15 m wide and 1.4 m depth were recommended as the optimal parameters for waterlogging controlling and desalination in coastal saline soil in Jiangsu Province.