干旱区生态环境知识资源中心(Arid): 喀斯特槽谷区表层喀斯特水化学的暴雨动态特征

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	喀斯特槽谷区表层喀斯特水化学的暴雨动态特征
其他题名	Storm-scale Hydrochemical Variation in Typical Rock Pendant of Chongqing
	孙钰霞 1; 李林立 2; 魏世强 3
来源期刊	山地学报
ISSN	1008-2786
出版年	2012
卷号	30 期号:5 页码:513-520
中文摘要	喀斯特水化学是在碳酸盐岩-水-CO_2气三相相互作用的开放系统中形成的,水化学变化既反映了喀斯特含水介质特点和喀斯特发育的程度,又反映了喀斯特区水土流失的进程。选择重庆市南川区南平镇兰花沟为代表,以兰花沟喀斯特动力系统观测站为依托,采用多功能自动化观测仪CTDP300,对暴雨条件下表层喀斯特泉的pH、电导率、水温和水位进行了连续自动监测。监测结果表明:1.表层喀斯特带对降雨很敏感,其喀斯特水化学明显受降雨条件的影响。在强降雨开始时,喀斯特水pH升高,水温降低、电导率降低、PCO_2降低,方解石饱和指数(SIc)升高,喀斯特泉水化学表现出雨水的"活塞效应"。2.在强降雨中后期,表层喀斯特水pH、电导率、水温下降,方解石饱和指数(SIc)降低,这表明稀释作用可贯穿整个降雨过程,但在降雨后3~4 h,表层喀斯特带的高裂隙率和渗透性开始发挥作用,水动力作用和CO_2效应逐渐占据主导地位。因此,降雨过程中有两个重要的作用在控制着水化学的动态变化,一是雨水的稀释作用,二是碳酸盐岩-水-CO_2气相互作用。3.根据喀斯特水化学在降雨条件下不同结构的含水介质中的反应,兰花沟表层喀斯特带含水介质以管道为主。4.土地利用类型的改变也会影响到表层喀斯特水化学对暴雨的响应。
英文摘要	Karst water chemistry was formed in open system of carbonate rock-water-CO_2 interaction.Under storm rain,chemical change of karst water could not only reflect the type of aquifer,but also soil and water loss and desertification administering in karst area.So based on the storm rain,the study on karst water chemistry was very important for desertification administering and soil and water use in karst area.The thesis aimed at Lanhuagou spring in the Nanping country,Chongqing to understand the hydro-chemical phenomenon that occurs in the water of Epikarstic aquifer.A site`s automatic records(CTDP300) was fixed up which could inspect five indexes such as rainfall,pH,conductivity,water temperature,water level.According to the data from automatic records the study was showed that: 1.Epikarst and its Hydro-chemical change are highly sensitive to the rainfall.At the beginning,there are increased pH and SIc,deduced watertemperature,conductivity and Sic for the epikarst spring with the rainfall running.Its showed an "piston effect".It meaned that epikarst water was moved out from karst aquifer under great water pressure because amount water from rain water entered karst aquifer in a short time.It leaded that PCO_2 of karst water depressed and its SIc inclined. 2.According to experiment it was approved that there are at least two important processes that dominated the hydro-chemical variation.On one hand,it is the dilution of rainwater,and on the other hand,it is the carbonate rock-water-CO_2 interaction.At he beginning of rainstorm,physico-chemical variation of spring is mainly controlled by dilution effect and it can last for the entire rainfall process.But 3-4 hours later,hydrodynamic effect and CO_2 effect would occupy the dominant positon due to the high fissure rate and permeanbility in epikarst.Whereas,dilution effect only acts on the earliest period of light rain. 3.under the rain hydro-chemical change of epikarst spring is different in conduit aquifer and fracture aquifer.The carbonate rock-water-CO_2 interaction is the dominated process in the fracture aquifer.But in the conduit aquifer the dilution of rainwater is the main process.Based on the theory aquifer of Lanhuagou spring is mainly composed of conduits. 4.Transformation of land use type could affect the chemical variety of Epikarst water under rainstorm.
中文关键词	表层喀斯特泉 ; 降雨 ; 碳酸盐岩-水-CO_2相互作用 ; 喀斯特水水化学动态
英文关键词	epikarst spring rainfall carbonate rock-water-CO_2 interaction hydro-chemical change of karst water
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:4665133
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228393
作者单位	1.西南大学地理科学学院, 重庆 400715, 中国; 2.西南大学地理科学学院, 三峡库区生态环境教育部重点实验室, 重庆 400715, 中国; 3.西南大学资源环境学院, 重庆 400715, 中国
推荐引用方式 GB/T 7714	孙钰霞,李林立,魏世强. 喀斯特槽谷区表层喀斯特水化学的暴雨动态特征[J],2012,30(5):513-520.
APA	孙钰霞,李林立,&魏世强.(2012).喀斯特槽谷区表层喀斯特水化学的暴雨动态特征.山地学报,30(5),513-520.
MLA	孙钰霞,et al."喀斯特槽谷区表层喀斯特水化学的暴雨动态特征".山地学报 30.5(2012):513-520.