The Application Research Of Remote Sense Technology In The Monitor Of Irrigation Area

As an agricultural country, agricultural water use accounts for70%of the total water consumption in China, of which four-fifths are for irrigation. For large irrigation districts, more than90%of water is consumed for farm use. However, problems like underutilization of water, unstable water supply and imbalanced supply of and demand for applicable water remain to exist and result in low food production. To a large extent, the main reason for the existing problems is the low efficiency of irrigation methods. Therefore, in order to promote the overall efficiency in water use, information technology needs to be applied in all the stages of irrigation management, from first-stage construction of infrastructure facilities to the late-stage software development.Therefore, this thesis draws on the program of "early observation of water resource management and application information sevice---water resource monitoring, evaluation and management" from the major special project "high resolution earth observation systems" of The National Medium-and Long-Term Program for Science and Technology Development. On the basis of theories on soil moisture and drought monitoring, this thesis aims to monitor the actual irrigated areas before and after irrigation in Hetao irrigated region in Inner Mongolia by using remote sensing image data.In the first part, Dongfeng main canal in Dengkou County, Hetao Irrigating Area of Inner Mongolia, is introduced and analyzed. The models of Perpendicular Drought Index (PDI) and Modified Perpendicular Drought Index (MPDI) are established after cropping and correcting the satellite data of HJ-1A/1B, a domestic environmental satellite, geometrically, accurately and atmospherically. The satellite data is also used to set influence threshold and monitor the actual irrigated areas before and after irrigation. Additionally, the models of Perpendicular Drought Index (PDI) and Shortwave Infrared Perpendicular Short Index (SPSI) are established for probing into soil drought situation of irrigated areas and further extrapolating irrigation after the analysis of irrigation areas of Hetao Irrigating Area, Inner Mongolia through Landsat TM satellite, an American land explorer satellite.The results from the present investigation suggest that through monitoring models, visualization of irrigation areas in a large range can be realized, which provides technical support for real-time irrigation monitoring and management, improves efficiency of water use for irrigation and supplies scientific evidence for the protection of regional food production safety.