南方典型溶蚀丘陵系统现代岩溶作用强度研究

我国典型溶蚀丘陵系统分布于湖南中西部雪峰山地区的新化 -涟源县一带。主要宏观岩溶地貌类型有丛丘谷地、峰丘谷地、峰丛洼 (谷 )地、丘岭谷地。它们之间岩溶发育程度、形态组合特征差异明显。本文在论述不同地貌系统岩溶水水化学特征及其溶蚀能力的基础上 ,用水化学平衡法对不同地貌区的溶蚀速度进行了计算 ,并分析了现代岩溶作用强度趋异的原因。溶蚀丘陵区平均溶蚀速度为 2 5 .19m3·km- 2 ·a- 1 ,决定了该区宏观地貌以半岩溶形态为主导特征。

A Study on Modern Karstification Intensity of Typical Corrosional Hill System in South China

The typical corrosional hill system is mainly distributed in Lianyuan-Xinhua County,around Xuefeng mountain area.There are four karst landform types,namely clustered-hill valley,ridged-hill valley,peak-cluster depression and gentle-hill valley,which have quite different karst development histories and complex features.;Based on the discussion of hydrochemical features of karst water in various geomorphological systems and its corrosion capacity,the author calculated the corrosion velocity by using hydrochemical equilibrium method and analysed varied causes of modern karstification intensity.The average corrosion velocity in corrosional hill is 25.19 m 3·km -2 ·a -1 ,ranging form 10.26 to 30.04 m 3·km -2 ·a -1 , which led the semi-karst formation to the prominent macro-geomorphologhical pattern in the study area.