Research Of Automatic And Real-time Monitoring Technology For Coastal Saline Soil Water And Salt Transport

As one of the five soil problems that have plagued humanity, saline soils arewidespread in China, which can be classified into inland saline soil and coastal salinesoil by the difference of distribution positions. In Shandong province, coastal salinesoil is mainly distributed in the Laizhou Bay and Yellow River Delta, which is theimportant land-reserved resources. Therefore, it is of great economic and socialsignificance for the study of monitoring of the coastal saline soil. The transportationof water and salt is a complex dynamic process relating to the formation anddevelopment process of the saline soil, and thus the core of the research on saline soil.In this paper a remote in-situ automatic monitoring system is developed and used tomonitor the water and salt movement,which is funded by the project of "Storm in theNational High Technology Research and Development Program (863Program)process of sediment resuspension flux in situ monitoring techniques(No.2008AA09Z109)”,for the purpose of development of in-situ real-time automaticmonitoring system on the transportation of saline soil water and salt and investigationof the forming mechanism and management of saline soils.The paper begins with the introduction of saline soil monitoring technology.Based on the advantages and disadvantages of previous technology, the water and salttransport real-time automatic monitoring system is hereby introduced, and anoptimization design makes the system more applicable to the monitoring of thecoastal saline soil water and salt transport processes. Through a series of laboratoryand field tests, the method on determining the characteristics of saline soil water andsalt transport process and the migration rate is found, and the overall work of thesystem’s effect is inspected, establishing the foundation for the next verification ofsystem optimization and analysis of the saline soil water and salt transport process.First, the paper introduces both a variety of saline soil monitoring technologies athome and abroad and the theoretical background of saline soil, according to the inadequacies in existing technologies of in-site monitoring, the application of the setsof resistivity monitoring system is now required.Second, on considering the site conditions and resistivity probe features, areal-time automatic system monitoring the saline soil water and salt transport processis well described, we optimize the design of this system: change the one probe into theplug-in, optimizes the circuit board, and add the automatic cartography and remotecontrol functions, so that the monitoring system more applicable.Finally, the paper introduces a series of indoor and outdoor tests, through theanalysis of test results, we found that:(1) monitoring data and total salt are of goodexponential relationship;(2) after leaching progress the soil began to desalinationfrom surface, and the desalination depth is proportional to the amount of leachingwater;(3). the salt transport rate is logarithmical with time and the rate is slowingdown after a leaching progress;(4) salt migration rate is different with differentsoil, The sand’s rate is about10times of the silt’s;(5) the existence of groundwaterwill reduce both the rate of soil water and salt transport and the desalination progress;(6)the stability of the monitoring system for field work, data acquisition and remotetransmission is verified.It is the first time to realize the optimization of the resistivity measurementssystem design for remote, automatic monitoring saline soil water and salttransport. Drawn through the indoor and outdoor tests and analysis of test data, thesystem in real time, automatic measurement of the resistivity changes during thesaline soil water and salt transport process and the remote transmission of monitoringdata is verified, which can accurately determine the saline soil water and saltchanges. All in all, this study enriches the saline soil water and salt transportmonitoring technology and provides a viable means of remote, in-situ and automaticmonitoring the evolution saline soil, which have a broad range of applications anddevelopment prospects.