滦河现代三角洲演变的几何学特征

滦河三角洲位于渤海湾北岸，是1915年滦河改造进入现今位置入海之后形成的一个典型的扇状三角洲，在三角洲发育过程中，人类河流水利工程对其演变产生了巨大的影响，三角洲大致经历了堆积前展、相对稳定和侵蚀衰亡3个阶段，不同阶段扇状三角洲表现出不同的几何学特征。作者在野外调查基础上，以1932年以来不同时期地形图和TM遥感数据为依据，对三角洲演变的几何学特征进行了研究，从而为认识扇状三角洲的发育阶段和三角洲海岸演化的预测研究提供了一种数学方法。

Geometric Features of Modern Luanhe River Delta Evolutton

A typical fan-shaped modern delta of the Luanhe River located at the northern coast of Bohai Bay has been developed since the diversion of the river in 1915. In the course of the delta evolution , a great impact has been produced due to man's activities in water conservancy projects.The delta evolution has gone through three phases:accretionary phase, relative stable phase and dying phases. In different phases, the fan-shaped delta has different geometric features. on the basis of field investigation ,the geometric features of the delta evolution have heen studied according to the topographic maps and TM remote sensing data at different periods since 1932, thus providing a mathematic method for understunding the developmental stages of the fan-haped delta and making forecast studies on the coastal evolution of the delta.