引黄滴灌条件下混配水对堵塞物质表面特征的影响

Effects of Mixing Yellow River Water with Brackish Water on Surface Characteristics of Emitter’s Clogging Substance in Drip Irrigation

为探明引黄滴灌条件下黄河水与微咸水混配对滴灌系统灌水器堵塞物质表面特征的影响,选择黄河水(YR)、微咸水(SW)以及黄河水和微咸水1∶1混配水(MW)3种水源,针对灌水器流道内易形成堵塞物质的位点,进行堵塞物质形成过程的模拟培养,借助三维白光干涉形貌仪观测并分析灌水器内部堵塞物质的表面形貌及变化特征,结果表明:黄河水与微咸水混配后堵塞物质表面凸起少,较为平坦;堵塞物质的厚度、表面均方根偏差、表面展开面积比率显著降低。其中,系统运行结束时(800 h),混配水条件下堵塞物质的平均厚度为4.39μm,分别比黄河水、微咸水条件下低65.32%、32.51%,这充分说明黄河水和微咸水混配后可有效缓解灌水器堵塞。

Mixing Yellow River water with brackish water for drip irrigation can be an effective solution of water shortage because the mixed water contains less sediment and salinity.However,the mixed water can still cause emitter clog and significantly reduce drip irrigation system performance because of the sediment particles and salt separators.The surface morphology of the clogging substance is an integral reflection of multiple factors.Therefore,three different types of water,including the Yellow River water(YR),brackish water(SW)and mixed water(MW)of Yellow River water and brackish water at the mixing ratio of 1∶1 were used to cultivate the emitter’s clogging substance.The effect of the mixed water on the surface characteristics was studied by 3D white-light interference profilometer.The results showed that the surface of clogging substance in condition of the mixed water was less protruding and more flat,the thickness,Sq and Sdr were decreased significantly.At the end of the system operation(800 h),the average thickness of the clogging substance under the mixed water was 4.39μm,which was 65.32%and 32.51%lower than that of the Yellow River water and brackish water,respectively.The result showed that the mixed water can not only effectively reduce the sediment content in the Yellow River water,but also reduce the salt content in the brackish water.The mixed water relieved emitter’s clogging effectively because of low sediment content and salinity.