南京大学学报(自然科学版) ›› 2010, Vol. 46 ›› Issue (6): 664–670.

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 用 Ca 2+ 离子浓度估算岩溶地区岩石溶蚀速率: 以贵州普定为例*

 王腊春 1 ** , 蒙海花 1 , 苏维词 2 , 徐泽林 3
  

  • 出版日期:2015-04-07 发布日期:2015-04-07
  • 作者简介: ( 1. 南京大学地理与海洋科学学院, 南京, 210093; 2. 贵州科学院山地资源研究所, 贵阳, 550001; 3. 贵州普定岩溶研究试验站, 普定, 562100)
  • 基金资助:
     国家自然科学基金( 40571024) , 国家"973"基础研究计划( 2006CB403208)

 Estimate of erosion rates in a karst region using calcium concentrations: A case study of Puding, Guizhou, southern China

 Wang La Chun 1 , Meng H ai Hua 1 , Su Wei Ci 2 , X u Ze?Lin 3
  

  • Online:2015-04-07 Published:2015-04-07
  • About author: (1. School of Geography and Ocean Sciences, Nanjing University, Nanjing, 210093, China;
    2. Institute of Mountain Resources, Guizhou Academy of Sciences, Guiyang, 550001, China;
    3. Karst Research Station of Puding County, Guizhou, 562100, China)

摘要:  在探讨岩石溶蚀速率计算方法的基础上, 根据研究区特殊的岩溶地质特征, 提出了采用 Ca 2+ 浓度估算岩溶流域岩石溶蚀速率的新方法. 首先, 将 Ca 2+ 浓度换算成 CaCO 3 浓度, 结合实测流量, 计算
出实际流失的 CaCO 3 , 并换算成流域平均岩石溶蚀量, 然后根据岩石的平均容重, 计算出流域岩石溶蚀厚度, 经过换算得到流域岩石溶蚀速率, 该方法适用于可溶岩中碳酸钙的比例较大的闭合区域. 贵州普
定后寨河流域母猪洞子流域为可溶岩中碳酸钙的比例约 98% 的封闭的洼地, 因此可以使用该方法进行计算. 通过该方法对研究区岩石溶蚀速率的计算可知, 该研究区的平均溶蚀速率为 41 ? 5mm/ ka, 该研究
区枯水期的岩溶溶蚀速率基本都小于丰水期的岩溶溶蚀速率, 与前人对该地区的研究结果非常相近, 说明该方法是可行的, 为以灰岩为主的岩溶地区地质溶蚀研究提供了一种新的思路.

Abstract:  This paper puts forward a new method for estimate of the erosion rates of a karst region using calcium concentrations. First, the calcium concentrations are converted into the calcium carbonate concentrations; then, the
CaCO 3 loss rates are calculated based on the calcium carbonate concentrations and the discharges; finally, the corrosion rates of the rocks are calculated. T he erosion rates are concluded from the average bulk densities and the
corrosion rates of the rocks. T his method can be applied to an area that is closed and has a high calcium carbonate ratio of rocks. The Muzhudong sub?catchment (Guizhou province, southern China) is a very closed region and the
calcium carbonate ratios of the rocks are up to 98%, so this method can be applied to this region. Our results show that the average erosion rate of the Muzhudong sub ?catchment is about 41 ? 5 mm/ ka, which is very close to the
previous estimates obtained based on other methods. Therefore, we believe this method is valuable in that it provides a new tool for studying erosion of the karst regions.

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