摘要
为优化再生水与淡水交替供水方式,研究交替供水方式对红壤入渗特性及水盐分布规律的影响,以确定最优交替供水方式。选取5、10g/L 2种浓度钠盐溶液和淡水为试验用水,设置了咸淡水混合(SF混合)、咸淡交替(SF)、淡咸交替(FS)、咸淡咸淡交替(SFSF)和淡咸淡咸交替(FSFS)5种供水方式,并以淡水(CK)为对照,进行一维垂直土柱入渗试验。结果表明:2种钠盐浓度下累积入渗量随着交替次数增加而增加,360min入渗时刻,5 g/L和10 g/L淡咸淡咸交替处理分别比淡咸交替处理增加了28.85%和18.98%;Philip模型更适合描述FS交替供水和CK下土壤累积入渗量随入渗时间的变化,Kostiakov模型更适合描述SF混合、SF、SFSF、FSFS处理下红壤入渗特征;土壤剖面盐分分布受交替供水方式的影响,盐分累积程度受钠盐浓度的影响,在同一供水方式下,2种钠盐浓度的电导率(EC)分布规律一致,且随钠盐浓度增加,EC值增大。5g/L下淡咸淡咸交替供水能增强土壤入渗能力,降低土壤盐分累积,为最优交替供水方式,推荐淡咸淡咸交替供水为南方亚热带区红壤再生水灌溉方式。
In order to optimize the alternating water supply mode of reclaimed water and fresh water,this study analyzed the influence of alternating water supply mode on the infiltration characteristics of red soil and the distribution of water and salt,so as to determine the optimal alternating water supply mode.In this study,5 g/L and 10 g/L sodium salt solution along with fresh water were selected as the test water,five water supply methods were set up with brackish water mixture(SF mix),salt-light alternation(SF),light-salty alternation(FS),salt-light and salt-light alternation(SFSF)and light-salt-light salt alternation(FSFS),and freshwater(CK)was used as the control to carry out one-dimensional vertical soil column infiltration test.The results showed that the cumulative infiltration rate of the two sodium salts increased with the increase of the number of alternating times,and the alternating treatment of 5 g/L and 10 g/L sodium salt solution increased by 28.85%and 18.98%compared with the alternating treatment of light and salty at 360 min.The Philip model is more suitable for describing the change of soil infiltration with infiltration time under CK and FS alternating water supply,and the Kostiakov model is more suitable for describing the infiltration characteristics of red soil under SF mixture,SF,SFSF,and FSFS treatment.The salt distribution of the soil profile was affected by the alternating water supply mode,the salt accumulation degree was affected by the sodium salt concentration,and the conductivity(EC)distribution of the two sodium salt concentrations was consistent under the same water supply mode,and the EC value increased with the increase of sodium salt concentration.The alternating water supply of light and brackish can enhance soil infiltration capacity and reduce soil salt accumulation under the treatment of 5 g/L sodium salt solution,which is the optimal alternating water supply method,and it is recommended that the alternating water supply of light and salty water supply be the irrigation method of
作者
李平
王辉
欧阳赞
LI Ping;WANG Hui;OUYANG Zan(College of Water Resource&Civil Engineering,Hunan Agricultural University,Changsha 410128,China)
出处
《节水灌溉》
北大核心
2023年第11期11-18,共8页
Water Saving Irrigation
基金
国家自然科学基金面上项目(41471185)
湖南省水利科技项目重大项目(XSKJ2021000-02)。
关键词
红壤
再生水
咸淡交替
入渗特性
入渗模型
red soil
treated wastewater
alternate saltish and fresh
infiltration characteristics
infiltration model
