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Displaying 401 - 405 of 1605Geologic, topographic and climatic controls in landslide hazard assessment using GIS modeling: A case study of Souk Ahras region, NE Algeria
Landslides are the most common hazard in mountainous regions of northeast Algeria. In this study, landslide hazard zonation of Souk Ahras province was carried out using a Raster-based GIS and statistical processing. Landslide locations were defined from interpretation of aerial photographs and field surveys. Rotational, planar and complex landslides were identified.
Analysis of past and future dam formation and failure in the Santa Cruz River (San Juan province, Argentina)
Around 11.5∗10⁶m³ of rock detached from the eastern slope of the Santa Cruz valley (San Juan province, Argentina) in the first fortnight of January 2005. The rockslide–debris avalanche blocked the course, resulting in the development of a lake with maximum length of around 3.5km. The increase in the inflow rate from 47,000–74,000m³/d between April and October to 304,000m³/d between late October and the first fortnight of November, accelerated the growing rate of the lake. On 12 November 2005 the dam failed, releasing 24.6∗10⁶m³ of water.
Relationships between aquatic biotic communities and water quality in a tropical river–wetland system (Ecuador)
Many tropical wetlands threatened by land use changes, or modifications in hydrological regime require effective management policies and implementation to protect them. The Abras de Mantequilla wetland, located in the Guayas River Basin in Ecuador, is subject to two major environmental disturbances, i.e., short-term agriculture (rice, maize) on the land around the wetland and the effects of planned infrastructure works of the Baba dam in the upper catchment. Both activities are expected to be the main constraints for the future wetland health.
Complexity of ecological restoration in China
Land degradation is a primary issue that affects environmental conservation and socioeconomic development. However, ecological restoration has complex and poorly understood consequences for the structure and composition of future ecosystems and socioeconomic systems. To illustrate the complexity of ecological restoration, we discuss the potential links between China's ongoing large-scale ecological restoration practices and the resulting changes of natural factors such as landscape characteristics, climate, and vegetation communities.
Predicting regolith thickness in the complex weathering setting of the central Mt Lofty Ranges, South Australia
We describe a model to predict regolith thickness in a 128,000ha study area in the central Mt Lofty Ranges in South Australia. The term regolith encompasses soil (A and B horizons) and highly weathered bedrock (C horizon). The thickness of the regolith has a major control on water holding capacity for plant growth and movement of water through the landscape, and as such is important in hydropedological modelling and in evaluating land suitability, e.g. for forestry and agriculture. Thickness estimates also have direct application in mineral exploration and seismic risk assessment.