海水入侵危险程度的非线性映射分析

Analysis on Risk Degree of Sea Water Intrusion Based on Nonlinear Mapping

海水入侵是我国沿海地区出现的一典型资源与环境问题.作者选用地质、气候、地理环境和人为因素等四类指标来反映海水入侵存在的风险,采用非线性映射分析将高维空间问题转化为低维空间问题.根据离差极小、最大欧氏距离等原理提出了海水入侵风险阈值求解方法与海水入侵风险判定方法,使存在海水入侵风险的区域可被及时、准确地判定出来.实例分析表明,该方法使分析结果真实、准确,为沿海地区海水入侵风险管理开辟了一条新途径.

Sea water intrusion is a typical problem of resources and environment existing in coastal areas of our country in recent years. The authors select seven indexes from four sorts such as geology, climate, geographical environment and human activities to reflect the risk of the sea water intrusion. The higher dimension space problem is transformed into lower dimension space problem by the method of nonlinear mapping. According to the principle of different particle and distance maximal, the effectively method for calculating the threshold value of sea water intrusion is brought forward. Meanwhile, the correct model for the judgment and monitor of the sea water intrusion risk is established. It solves the prob^m that there isn＇t scientific method to judge the sea water intrusion cases. It can accurately judge the risk in the beginning of sea water intrusion, provide alert function for ~the monitor of the risk for area existing sea water intrusion. The calculating example is given. The analytic result attained by this new method is true and reliable. A new approach to monitor risk of sea water intrusion in coastal areas is developed.