ANNUAL PRECIPITATION SERIES WAVELET ANALYSIS OF WELL-IRRIGATION AREA IN SANJIANG PLAIN

摘要

The rapid increase of paddy field acreage has led to widely descending of groundwater table in well irrigation paddy area of low-land in Sanjiang Plain recent years. More and more "hanging pump" and partial over pumping phenomenon have been occurring in well irrigation paddy area of low-land. Therefore, the groundwater resources in Sanjiang Plain need to be recharged urgently. For solving the mentioned problems upon, the authors took Farm 853 as an example, analyzed the law of multi-time scale series and characteristics of actual annual precipitation change in Farm 853 through using the wavelet theory, and the main periods of annual precipitation change and variation trend of drought-flood in this area were obviously. The study can provide scientific decision for fully utilizing precipitation, recovering groundwater and sustainable utilization in Farm 853 so much as the entire Sanjiang Plain.