Experimental study on desorption of soluble matter as influenced by cations in static water

作     者：Wen-sheng XU Li CHEN Xiao-xia TONG Xiao-ping CHEN Ping-cang ZHANG 

作者机构：Division of Soil and Water ConservationChangjiang River Scientific Research Institute State Key Laboratory of Water Resources and Hydropower Engineering ScienceWuhan University 

出 版 物：《Water Science and Engineering》 (水科学与水工程（英文版）)

年 卷 期：2014年第7卷第4期

页      面：384-394页

核心收录：

学科分类：08[工学] 0707[理学-海洋科学] 0815[工学-水利工程] 081502[工学-水力学及河流动力学] 0813[工学-建筑学] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.51209014) the Fundamental Research Funds for the Changjiang River Scientific Research Institute(Grant No.CKSF2013012/TB) 

主　　题：soluble matter desorption cation sediment static water indoor experiment 

摘      要：With variation of drainage basin environments, desorption of soluble matter has become one of the significant erosion processes in rivers. It has a considerable impact on flow and sediment transport, as well as processes of river bed deformation and landform evolution throughout a watershed. In this study, considering influences on sediment movement, especially on cohesive sediment transport, Ca^2＋ and H^＋ were chosen as characteristic ions of soluble matter, and the total desorption quantity of Ca^2＋ and pH value when the desorption equilibrium is reached were employed as two indexes representing the desorption of soluble matter. By means of an indoor experiment, desorption of soluble matter as influenced by cations in static water was investigated. The results show that the total desorption quantity of soluble matter increases with the initial cation concentration until a maximum desorption quantity value is obtained and maintained. The total desorption quantity of soluble matter depends on properties of the specific cations in static water, and the stronger the affinity is between the cation and sediment surface, the higher the total desorption quantity will be. Finally, a strong approximate linear relationship between desorption quantities for different kinds of soluble matters was obtained, which means that variation of pH values can accurately reflect the desorption results of soluble matter.