Document Type : Research Paper
Author
Assistant Professor, Agricultural and Natural Resources Research Center, Zanjan, Iran
Abstract
The TDR device is implicating to monitor soil and hydrology of flood spreading stations all over the country. Along this concept, the surveying of errors that caused by long-term installation of sensors, have been realized in Zanjan flood spreading station. For this purpose, six profiles in flood spreading and two others in non flood spreading area have been dug with 1.5 m depth and totally 36 bury able sensors installed in different layers. The soil moisture was determined along two years with time interval of one week. The results show some interruptions in the data time series that caused by the device’s message of “time measurement failed”. The temporal and spatial analyses of data series, state increasing of missed data from primary to second year because of leaching and from west to east zone for the reason of high volumetric concentration of water in that area. With dividing the data collection period to three nearly 70 days periods at every layer indicated that, the percent of missed data increased twin along with time and declination of moisture. The main source of error is leaching the particles around the electromagnetic guide rods of sensors and adding to the pores and interfacial distance of rods and soil particles.
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