表层岩溶带土壤温度和体积含水率对夏季暴雨事件的响应

发布时间：2019-05-05 05:49

【摘要】：为揭示表层岩溶带土壤温度和体积含水率对暴雨事件的响应机制,利用HOBO土壤温度和体积含水率监测仪,连续监测2014年7-8月20cm和70cm土壤温度与体积含水率。结果表明:研究区域20cm土壤温度呈日变化,这种日变化格局主要受到大气温度日变化的影响,70cm土壤温度总体上呈上升趋势,主要受到夏季大气环流使气温升高的影响。夏季暴雨事件降低了20cm深度的土壤温度、增加其土壤体积含水率,并且导致70cm处土壤温度先增高后降低、土壤体积含水率升高。土壤体积含水率较低情况下,暴雨事件使得浅层较高温度土壤水快速向下移动引起升温,而后土壤体积含水率到达一定阈值后,便能够快速响应降水事件。研究表明,岩溶地区不同深度土壤温度和体积含水率受到夏季降水事件的影响存在差异。浅层土壤能够快速的响应暴雨事件,深层土壤温度和体积含水率对暴雨事件的响应不仅受到降水量阈值的影响,而且也受到表层土壤温度和体积含水率的制约。
[Abstract]:In order to reveal the response mechanism of soil temperature and volume moisture content in surface karst zone to rainstorm events, 20cm and 70cm soil temperature and volume moisture content were continuously monitored by HOBO soil temperature and volume moisture content monitor from July to August 2014. The results showed that the diurnal variation of soil temperature of 20cm was mainly affected by the diurnal variation of large temperature degree. The soil temperature of 70cm showed an upward trend as a whole and was mainly influenced by summer atmospheric circulation. The heavy rain in summer reduced the soil temperature of 20cm depth, increased the soil volume moisture content, and led to the increase of soil temperature at 70cm and then decrease, and the increase of soil volume moisture content. When the soil volume moisture content is low, the heavy rain event causes the rapid downward movement of the shallow high temperature soil water, and then when the soil volume moisture content reaches a certain threshold, it can quickly respond to the precipitation event. The results show that the effects of summer precipitation events on soil temperature and volume water content in different depth in karst area are different. Shallow soil can quickly respond to rainstorm events. The response of deep soil temperature and volume moisture content to rainstorm events is not only affected by precipitation threshold, but also restricted by surface soil temperature and volume moisture content.
【作者单位】：中国地质科学院岩溶地质研究所/国土资源部广西壮族自治区岩溶动力学重点实验室;中国地质大学(北京);广西区域地质调查研究院;广西水文地质工程地质队;
【基金】：广西青年科学基金项目(2014GXNSFBA118227) 国家自然科学基金项目(441501222,41372190,41530316) 中国地质调查项目(12120113005700,DD20160305) 中国地质科学院基本科研业务费(YYWF201513)
【分类号】：P426.62;S152

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