宁夏平罗盐碱地泥质和砂质排水渠道能耗率变化研究

Study on Stream Power of Muddy and Sandy Drainage Channels in Saline-Alkaline Land in Pingluo County of Ningxia

灌溉排水渠道在开发农田水利工程方面扮演着重要的角色,在防御涝渍灾害和土壤盐碱化等方面起着积极的作用。根据宁夏平罗西大滩地区以白僵土、沙土所铺设成的排水渠道的能耗率特点,采用水槽试验的方法,来分析不同土质排水渠道的稳定性及其侵蚀特征。结果表明:在给定的条件下,泥质排水渠道能耗率大大小于沙质排水渠道,并且能够很快降低能耗率,以达到河道的平衡状态,在排水方面具有相对的高效性,同时泥质渠道比沙质渠道具有更高的稳定性。所以,在宁夏平罗地区盐碱地开发及治理中,宜采用泥质排水渠道。

Irrigation and drainage channels play an important role in developing irrigation projects in farmland,and also an active role in controlling water logging and saline-alkaline disasters.In this study,a flume experiment was carried out to analyze the gross and specific stream power of the drainage channels,and two channels in Pingluo County of Ningxia Hui Autonomous Region were separately paved with saline soil and sand.The stability and erosion of these drainage channels were analyzed based on the characteristics of stream power.The results showed that,under the given conditions,the gross stream power of the muddy drainage channel was much lower than that of the sandy one,and it could be quickly reduced to achieve a balance of the channel.The experiment also revealed that the stability of muddy channel was higher than that of the sandy one.Therefore,it is suggested to take muddy channel in developing and improving saline soil in Pingluo County.