Overhead transmission lines are the main form of high-voltage and UHV long-distance transmission. When line path passes through limestone areas, mining areas others, possible existence karst caves mined-out under tower base will have a greater impact on stability foundation. According to previous detection experience, different underground cave forms requirements need choose suitable technology...

Evaporite calcitization within the Castile Formation of the Delaware Basin is more widespread and diverse than originally recognized. Coupled field and GIS studies have identified more than 1000 individual occurrences of calcitization within the Castile Formation outcrop area, which includes both calcitized masses (limestone buttes) and laterally extensive calcitized horizons (limestone sheets)...

Study area.-All the study streams are on the northern quarter of Prince of Wales Island (Figure 1) and traverse a mixture of karst and nonkarst geology. Some streams are fed directly by resurgence from limestone caves, whereas others are fed by overland flow. Hecata Limestone and Bay of Pillars are the major karst formations (Wissmar et al. 1997). Many of the streams flow along contact zones be...

Karst is geomorphologically composed of limestone. However, limestone very susceptible to weathering due the influence water, which can cause land subsidence. The resistivity method often used determine potential for subsidence, while geotechnical methods are commonly considered capable juxtaposing with support interpretation accuracy. current research was conducted subsidence in karst area Lap...

Three new species of Polystichum (Dryopteridaceae), P. paramartini R. H. Jiang et X. C. Zhang, sublanceolatum and venosum are described illustrated. They all from the limestone mountains in South Southwest China. The first two found caves while third one occurs on mountain slopes. Detailed descriptions, line drawings, ecological preferences, conservation status provided.