岩溶地区泉水在河边出露，对泉水开发利用就形成傍河型岩溶水水源地，此类情况泉口和河流连通并发生交互作用。交互带本是生物地球化学过程活跃的地带，发挥污染物降解等功能。但如果因河流带来的物质在泉口沉积导致交互功能丧失，泉口水环境就会退化，因此有必要专门提出泉口交互带的概念来研究这种特殊的交互带，以解释退化的原因。本研究以三个地质背景相似但地下水与地表水交互、水生生态退化有差异的岩溶泉为例，拟通过水下层析影像、水文观测、示踪试验和222Rn同位素方法，研究泉口-河流交互的水动力学过程，基于交互方式和程度差异，探讨泉口交互带的内涵；通过敏感的地球化学指标以及鱼粪污染物降解的观测，研究交互带功能发挥的机制；以浮游生物和微生物群落结构的变化反映水环境对交互功能退化的响应。以此揭示岩溶泉口交互带功能退化的原因以及改善环境功能的措施。建立一个通过水文-生态-环境相互作用认识岩溶水的途径，使水资源管理更有效。

Some springs in karst area outcrop along the river. These springs are usually water supply sources and are highly exploited. Under this situation, spring outlets connect with rivers and they have frequently but casually interaction. Researches on surface water-groundwater interaction in river have indicated that hyporheic zone owns the most active biogeochemical processes and plays a variety of functions, such as pollutant attenuation. But if the function of hyporheic zone is lost in karst spring due to the substance carrying by river backflowing, water environment in karst spring will be degenerated. Therefore, it is necessary to set up the concept of spring hyporheic zone to study this special kind of hyporheic zone and to explain the reasons for water deterioration. Moreover, the function of hyporheic in karst water system and how it develops are rarely involved. Take three important springs with the similar geological background but different patterns of groundwater and surface water and submerged plant degeneration as the case studies, the dynamic processes of spring and river interaction will be studied through underwater tomography, high-precision hydrological monitoring, dye tracer test, and 222Rn isotope analysis. Based on the difference of interaction patterns and degrees, the concept and meaning of spring hyporheic zone will be discussed. By measuring the sensitive biogeochemical parameters, especially the processes of fish manure degradation, the mechanism of hyporheic zone will be studied. According to the spatial and temporal comparison of structure community of plankton and microorganism, the respond of water environment to function degeneration of hyporheic zone will be discovered. Based on these, the causes of function degeneration in spring hyporheic zone and the measures to improve the function will be revealed. This project will lead to a new approach to understand karst water, combined with interaction among hydrology, ecosystem, and environment, in order to make the water sources management more effective.