نتایج جستجو برای: hydrological and ecological needs
تعداد نتایج: 16856274 فیلتر نتایج به سال:
The benefit derived from the creation of man-made lakes in Nigeria and other developing countries is usually associated with great risks. Whenever we establish a dam, it appears we dam the inherent consequences to the detriment of man and his environment. Debts were incurred by the countries concerned, man and animals were displaced, arable lands destroyed including degradation of forest and wi...
As one of the key tools for regulating human-ecosystem relations, environmental conservation policies can promote ecological rehabilitation across a variety of spatiotemporal scales. However, quantifying the ecological effects of such policies at the regional level is difficult. A case study was conducted at the regional level in the ecologically vulnerable region of the Loess Plateau, China, t...
Evapotranspiration (ETc) is the mean for exploiting irrigation water and constitutes a major component of the hydrological cycle (Telis et al., 2007; Papadavid, 2011). The ETc is a basic and crucial parameter for climate studies, weather forecasts and weather modeling, hydro‐ logical surveys, ecological monitoring and water resource management (Hoedjes et al., 2008). In the past decades, the es...
Two foundational questions about sustainability are "How are ecosystems and the services they provide going to change in the future?" and "How do human decisions affect these trajectories?" Answering these questions requires an ability to forecast ecological processes. Unfortunately, most ecological forecasts focus on centennial-scale climate responses, therefore neither meeting the needs of ne...
Abstract Natural fluctuation of the hydrological regime is key to maintaining river ecosystem function and health. Given shortcomings previous studies on change ecological response Min River, this study combined two degree evaluation methods Budyko theory quantify ecohydrological its driving factors. Ecological significance indicators (ecosurplus ecodeficit) Shannon index (SI) were used identif...
commonly used environmental flow evaluation techniques range in complexity. some requires stream flow records alone, and some accounts for the habitat requirements of individual species life-stages and physical characteristics of the stream. hydrological based methods for environmental flow assessment are the first step in planning for environmental allocation in developing countries. for deter...
the present work was carried out to investigate first, the ecology of the sepedon flies as well as speciesof lymnea snails and secondly, the biological effects of sepedon fly larvae living on lymnea. in this regard,the life cycle, death rate and compatibility of lymnea species, as well as the life cycle of sepedon flies inbreeding cage and the activity of the new larvae in the same ecological c...
This book consists of 14 chapters covering important aspects in regards to various terrestrial ecosystems, wetlands, river systems, mine site rehabilitation, marsh ecology and heavy metals pollution. Also aims to fill some of the information gaps in ecological restoration, particularly in under-researched ecosystems around the world. Restoration ecology emerged as a separate field in ecology in...
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