In situ precise measurement of erosion rates of carbonate rock blocks under flowing non-karst water using micro-erosion meter and the rate-determining factors
In February, September, December, 2004 and March, 2005, erosion rates of carbonate rock blocks in flowing non-karst water at Lijiadong, Chenzhou, Hunan Province were accurately measured with micro-erosion meter made in Australia. After processing these erosion rates with SPSS statistical software, it was found that erosion rates of carbonate rock blocks in non-karst water of Lijiadong observation site were very high, with the highest of 13. 6 mm /a. While measuring the erosion rates of carbonate rock blocks in non-karst water, the multi-parameter recorder of Multiline P3 made in Germany was used to measure temperature, pH and conductivity of water in situ, and the main ions in the water samples were analyzed in our laboratory. The results show that erosion power of the non-karst water at Lijiadong observation site is very strong. In other words, pco2 in the non-karst water was very high (up to 12 882 Pa), and the saturation index of calcite and dolomite was very low (up to -4. 78 and - 10. 35, respectively). There is reverse correlation between erosion rates of carbonate rocks and the saturation index of dolomite and calcite, i. e., the lower the saturation index of calcite and dolomite, the higher the erosion rates of carbonate rocks. Furthermore, the texture of carbonate rocks, especially the texture with coarse particles in dolomite rock showed strong influences on erosion rates of carbonate rocks, implying that the mechanical remove of the particles made huge contribution to erosion rates (possibly > 90% ). This is different from traditional method measuring erosion rates of carbonate rocks in soil, the latter representing mainly the chemical dissolution but not erosion (including both chemical dissolution and physical erosion).
non-karst water (allogenic water)chemical dissolutionphysical erosionerosion rateflow speedlimestonedolomite
NETL
NSTL
万方数据
