The Complexity Measure of Groundwater Depth Series in Sanjiang Plain Based on Approximate Entropy

Influenced by high-strength agricultural activities, climate and so on, the system of groundwater resources has gained more characters of complex system in Sanjiang Plain. Take Jiansanjiang Bureau for example, the approximate entropy is adopted to analyze the complexity of groundwater depth series in 7 production teams. The results show the complexity order from big to small as follows: 4th production team of Qianjin Farm, 69th production team of Qixing Farm, 22th production team of Qianjin Farm, 1th production team of 859 Farm, 26th production team of 859 Farm, 11th production team of Qianjin Farm, 21th production team of 859 Farm. We can see that the groundwater exploitation is the key factor in groundwater dynamic variation. The results reveal the essence of complex dynamic system, providing a basis for decision-making in managing groundwater resources scientifically in Jiansanjiang Bureau and even the Sanjiang Plain.