Climate and hydrological

Xem 1-19 trên 19 kết quả Climate and hydrological
  • Average depth model has a variety of applications in hydraulic engineering, especially in applications that flow depth is much smaller than the width of the flow. In this method the vertical variation is negligible and the hydraulic variables average integrated from channel bed to the surface free for the vertical axis. in equations arising management, pure hydrostatic pressure is assumed that not really valid in the case of flow in the bed is curved and can not be described curvature effects of the bed.

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  • This volume aims at providing a coherent presentation of recent developments and understanding of heavy metal reactivity in soils. Such an understanding is necessary in addressing heavy metals concerns in the environment. The implicit framework of multiple reactivity acknowledges the widely known role played by the various colloidal surface functional groups in concomitant reactions. This overarching frame of reference allows unification between molecular structure-reactivity relationships at one scale and transport processes at the other....

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  • Words can easily borrow, but the meaning of love from the heart of a people is difficult to describe. So I want to ask for forgiveness from the people that support can not be appreciated in the words and from those who, by any chance, I forgot to mention. First of all what I want to thank prof. dr.ir. Wind Herman and his wife - Joke. The interviews with prof. Wind held in Bangkok and his decision has helped me to be here, at the University of Twente, to carry out my doctoral research. Herman and Joke, I will never forget...

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  • The deposition in Day estuary tends to increase strongly due to abundant sources of sediment from the Red River system and the estuary is located in a concave coast where strong impacts of wave are eliminated. In this study, MIKE model developed by Danish Hydraulic Institute is employed to simulate, evaluate and forecast hydrodynamic regime as well as erosion, sedimentation and shoreline change processes in Day river mouth located in Ninh Binh.

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  • Karst is a medium which has traditionally been the subject of hydrogeological re- search, given the abundant water resources that are stored in it. In many cases karst is the product of climatic and hydrological evolution in carbonate areas in recent periods of geological history. Karst contains key information on recent environmen- tal changes. The action of water has generated a great range of karstic features that are part of our natural heritage and some of them form major tourist attractions (landscapes of natural parks, geosites and show caves, for example).

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  • Climate change is a long-term shift in the statistics of the weather (including its averages). For example, it could show up as a change in climate normalcy (expected average values for temperature and precipitation) for a given place and time of year, from one decade to the next. We know that the global climate is currently changing. The last decade of the 20th Century and the beginning of the 21st have been the warmest periods in the entire global instrumental temperature record, starting in the mid-19th century.

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  • SWAT model was used to assess the impacts of climate change on the streamflow of Ben Hai River Basin. The daily streamflow for 1979 - 1996 and 1997 - 2006 was used to calibrate and validate the SWAT model, respectively. Nash efficiency values for the daily comparison were 0.72 for the calibration period and 0.74 for the validation period. Three scenarios were analyzed relative to the baseli ne with 28-year time series. A doubling of the atmospheric C02 content to 660 ppm (while holding other climatic variables) resulted in a 7.

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  • In the framework of the program "Asian Cities Climate Change Resilience Network" funded by Rockefeller Foundation, Vietnam Institute of Hydrology, Meteorology and Environment carried out this study with the aim to strongly support the development of action plan to respond to climate change for Quy Nhon city. The study developed climate change (temperature and rainfall) and sea level rise scenarios corresponding to some key emission scenarios, namely A1FI, A2 and B2. Impacts of climate change on main sectors such as water resources, agriculture and tourism were also assessed.

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  • From the early explorers onwards, visitors to the Arctic and to Antarctica have commented with great interest on the presence of lakes, wetlands, and fl owing waters. These environments encompass a spectacular range of conditions for aquatic life, from dilute surface melt ponds, to deep, highly stratifi ed, hypersaline lakes.

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  • Diatoms are being used increasingly in a wide range of applications, and the number of diatomists and their publications continues to increase rapidly. Although a number of books have dealt with various aspects of diatom biology, ecology, and taxonomy, to our knowledge, no volume exists that summarizes the many applications and uses of diatoms.

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  • This study investigates impacts of climate change on water resource in the Huong River basin in the Central Vietnam. Hydrological responses of six climate change scenarios were calculated. Results reveal that climate change would cause significant increase in rainfall in wet season resulting in an increase in river flow. By contrast, the decreasing trend of river flow in dry season is a consequence of the decline of rainfall and increase of evapotranspiration under most scenarios. Sea level rise coupled with the lowering of river stages may exacerbate salinity intrusion.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Downscaling future climate scenarios to fine scales for hydrologic and ecological modeling and analysis

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  • In recent decades, the increasing in greenhouse gas emission has caused global warming leading to many adverse changes of the environment especially the sea level rise and the hydrological regime. The Dong Nai river basin having the downstream part below the sea level is among the most vulnerable basins to climate change. Recents studies showed that the sea level in the downstream of Sai Gon - Dong Nai river basin is rising. Many cities downstream of the basin especially Ho Chi Minh city are being flooded in flow tides which seriously affect the socioeconomic development.

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  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:" Hydrological and climatic responses of Pinus elliottii var. densa in mesic pine flatwoods Florida, USA"

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  • For each city, complex hydrometeorological models were then developed using a whole host of local information. These included (a) climate variables such as changes in temperature, precipi- tation, sea level rise, and storm surge; (b) socio- economic and developmental factors such as land subsidence, land use, and population increases; and (c) local topographical and hydrological information. Flooding in the metropolitan areas was chosen as the key variable to assess impact.

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  • The Study Team will make and define a series of assumptions about future land use, urban development, climate, geomorphic processes, the agricultural drainage system, and watershed management in the MRB. These assumptions will be used as input variables in the model system to simulate future (some specified year, e.g., 2025) conditions. The small watershed, large watershed, and river water quality model systems will be used to simulate future (without projects or change in management) conditions of system hydrology, loading rates, and Minnesota River water quality conditions.

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  • Over the next 100 years, climate models suggest that warmer temperatures will very likely lead to greater climate variability and an increase in the risk of hydrologic extremes, i.e., floods and droughts. Perhaps the most significant and likely impact is a change in the timing of runoff in watersheds with large amounts of winter snowfall as higher temperatures lead to an increase in the ratio of rain to snow, faster snowmelt runoff, and earlier loss of snow.

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  • One of the main findings of this study is that non- climate-related factors such as land subsidence are important and in some cases even more important than climate risks in contributing to urban flooding. In Bangkok for instance, there is nearly a two-fold increase in damage costs between 2008 and 2050 due to land subsidence. Further, almost 70 percent of the increase in flooding costs in 2050 in the city is due to land subsidence.

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  • In addition to global climate change, these include: the health risks posed by stratospheric ozone depletion; loss of biodiversity; stresses on terrestrial and ocean food-producing systems; changes in hydrological systems and the sup- plies of freshwater; and the global dissemination of persistent organic pollutants. Climate change and stratospheric ozone depletion are the best known of these various global environmental changes.

    pdf35p quygia123 01-11-2012 17 0   Download

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