نتایج جستجو برای: arid regions swift displacement along the river
تعداد نتایج: 16106126 فیلتر نتایج به سال:
The water crisis in arid and semi-arid regions is a limiting factor for human activities and sustainable agricultural development. One of the new solutions in this field is the construction of underground dams. Underground dams compared to conventional dams that store river water in open reservoirs; block the subsurface flow of water in the cross-section of the river and store it under the ...
Karst spring systems provide permanent water sources in semi-arid to arid environments, supporting a diverse aquatic community. Numerous karst streams in the Edwards Plateau and Trans-Pecos regions of Texas support two distinct fish assemblages, spring-associated species and riverine species. Previous studies have identified constant water temperature as the segregating factor but have lacked t...
Extended abstract 1- Introduction Fluvial and aeolian processes are important factors in changing the surface of morphology in the Earth. When rivers and sand dunes meet, the transportation of sediment between them can lead to one of the systems or both of them change. With their connection between river sediment and wind systems there would be lots of reactions, but very little has been st...
objective: zayandehrood habitat has economical and environmental importance in central plateau of iran and it performs a vital role for habitants, agriculture section and the industries which are located along river bed. so current research has been done to measure the contamination of heavy metals, its changes along the river route and defining the important and effective regions on this c...
drought is a complex natural phenomenon that can occur in any climate. hydrologic drought in the river flow of arid and semi-arid areas causes serious shortages, threatens the quality of life, and impacts on the economy. understanding this feature is then essential for the management of water resources. hydrologic drought in the sense of deficient river flow is defined as the periods that river...
in this study, scour of mashkid bridge pier located in mashkid river of saravan county has been studied and to measure the scour rate, the numerical model hec-ras 4.0 has been used. upon selection of mashkid river as the case study and whereas the studied zone is important with respect to the climatic conditions and showery monsoon raining and flowing the great and destructive floodwaters, ther...
In arid regions, C3 vegetation is assumed to be more sensitive to precipitation and CO2 fertilization than C4 vegetation. In this study, normalized difference vegetation index (NDVI) is used to examine vegetation growth in the arid Lower Heihe River Basin, northwestern China, for the past three decades. The results indicate that maximum NDVI (MNDVI) of the area increases over the years and is s...
malaysian mahseer, tor douronensis, locally known as “kelah” in peninsular malaysia or semah in sarawak is one of the important mahseers used for food as well as the aquarium industry and game fishing. this species is endemic to malaysian borneo river basins. the wild stocks of t. douronensis have declined substantially in recent years, due to over exploitation, pollution and illegal fishing pr...
Objective: Zayandehrood habitat has economical and environmental importance in central plateau of Iran and it performs a vital role for habitants, agriculture section and the industries which are located along river bed. So current research has been done to measure the contamination of heavy metals, its changes along the river route and defining the important and effective regions on this c...
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