Xem 1-20 trên 35 kết quả Hydrologic model
  • 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.

    pdf7p dem_thanh 22-12-2012 20 4   Download

  • The objective of the past work was to capture the main processes, both biophysical and economic, to reproduce them in a virtual world similar to reality. There have been two stages. In a first step, the team tried to select relevant knowledge to set-up a first conceptual model. As an hydrological model was already developed (Hoanh, et al. 2001), the emphasis was put on the economic and social processes. The first idea was to work on the interactions between decisions making at different scales.

    pdf10p quangdat 15-03-2009 329 59   Download

  • Modeling Hydrologic Change: Statistical Methods is about modeling systems where change has affected data that will be used to calibrate and test models of the systems and where models will be used to forecast system responses after change occurs. The focus is not on the hydrology. Instead, hydrology serves as the discipline from which the applications are drawn to illustrate the principles of modeling and the detection of change. All four elements of the modeling process are discussed: conceptualization, formulation, calibration, and verification.

    pdf434p crazy_sms 10-05-2012 44 16   Download

  • 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.

    pdf127p gauhaman123 17-11-2011 57 11   Download

  • Hydrology is the science that deals with the processes governing the depletion and replenishment of water resources of the earth's land areas. The purpose of this book is to put together recent developments on hydrology and water resources engineering. First section covers surface water modeling and second section deals with groundwater modeling. The aim of this book is to focus attention on the management of surface water and groundwater resources.

    pdf0p qsczaxewd 22-09-2012 35 7   Download

  • The potential evapotranspiration can be directly calculated by the Penman-Monteith equation, known as the one-step method. The approach requires data on the land cover and relatedvegetation parameters based on AVHRR and LDAS information, which are available in recent years. The Nong Son Basin, a sub-catchment of the Vu Gia - Thu Bon Basin in the Central Vietnam, is selected for this study. To this end, NAM model was used; the obtained results show that the NAM model has a potential to reproduce the effects of potential...

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  • Hydrology is a branch of scientific and engineering discipline that deals with the occurrence, distribution, movement, and properties of the waters of the earth. A knowledge of hydrology is fundamental to water and environmental professionals (engineers, scientists and decision makers) in such tasks as the design and operation of water resources, wastewater treatment, irrigation, flood defence, navigation, pollution control, hydropower, ecosystem modelling, etc.

    pdf145p tuanloc_do 04-12-2012 29 3   Download

  • The topic of calibration and verification of rainfall-runoff model has been subject of many researches. However, most of the researches using the continuous data for this task, while in the conditions of Vietnam, it is difficult to collect the sub-day continuous data. This leads to the need for methods that can calibrate and verify the model parameters from the event data. This paper introduces such a method. Idea of the method is to combine the auto-calibration and trialand-error methods.

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  • The use of pesticides in the United States has increased dramatically during the last several decades. Hundreds of different chemicals have been developed for use in agricultural and non-agricultural settings. Concerns about the potential adverse effects of pesticides on the environment and human health have spurred an enormous amount of research into their environmental behavior and fate. Much of this concern has focused on the potential for contamination of the hydrologic system, including surface waters.

    pdf353p 951628473 07-05-2012 39 11   Download

  • 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...

    pdf139p gauhaman123 17-11-2011 33 10   Download

  • The field of groundwater hydrology and the discipline of hydrogeology have attracted a lot of attention during the past few decades. This is mainly because of the increasing need for high quality water, especially groundwater.

    pdf232p cucdai_1 16-10-2012 25 6   Download

  • This work is intended to survey the basic theory that underlies the multitude of parameter-rich models that dominate the hydrological literature today. It is concerned with the application of the equation of continuity (which is the fundamental theorem of hydrology) in its complete form combined with a simplified representation of the principle of conservation of momentum. Since the equation of continuity can be expressed in linear form by a suitable choice of state variables and is also parameterfree, it can be readily formulated at all scales of interest.

    pdf177p kuckucucu 15-05-2012 44 5   Download

  • Over the past decade, many countries have been upgrading their water monitoring systems and their data collection efforts, supported with new information technologies and web‑based communication. A review of the information demands arising from OECD work, shows that important gaps still remain. The quality of water data currently available at national and international level is insufficient to effectively support integrated water management and water policies.

    pdf263p lulaula 25-10-2012 19 4   Download

  • 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.

    pdf364p phoebe75 01-02-2013 20 4   Download

  • 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

    pdf15p sting06 16-02-2012 23 3   Download

  • Chủ đề về hiệu chuẩn và kiểm tra mô hình lượng mưa, dòng chảy đã được chủ đề của nhiều nghiên cứu. Tuy nhiên, hầu hết các nghiên cứu bằng cách sử dụng các dữ liệu liên tục cho nhiệm vụ này, trong khi ở các điều kiện của Việt Nam, đó là khó khăn để thu thập các dữ liệu liên tục ngày phụ. Điều này dẫn đến sự cần thiết cho các phương pháp có thể hiệu chỉnh và kiểm tra các thông số mô hình từ các dữ liệu sự kiện.

    pdf0p hoatuongvihong 15-11-2011 24 2   Download

  • 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.

    pdf6p banhbeovodung 25-06-2013 19 2   Download

  • 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.

    pdf304p bi_ve_sau 17-01-2013 11 1   Download

  • Research over the past decade has demonstrated the feasibility of extracting topographic information of hydrological interest directly from digital elevation models (DEM). Techniques are available for extracting slope properties, catchment areas, drainage divides, channel networks and other data (Jenson and Domingue, 1988; Mark, 1988; Moore et al., 1991; Martz and Garbrecht, 1992). These techniques are faster and provide more precise and reproducible measurements than traditional manual techniques applied to topographic maps (Tribe, 1991)....

    pdf256p 951628473 07-05-2012 42 21   Download

  • Trước những năm 1960, sự sẵn có của dữ liệu thủy văn là rất hạn chế. Short hồ sơ của dòng chảy và lượng mưa đã có sẵn, nhưng đất dữ liệu, bản đồ độ che phủ đất và sử dụng, và dữ liệu về thay đổi lưu vực thời gian thường không có sẵn. trong Ngoài ra, sự sẵn có của máy tính bị hạn chế. Những hạn chế của dữ liệu và hỏa lực tính toán hạn chế các loại phương pháp thủy văn có thể được phát triển cho sử dụng chung.

    pdf20p bengoan369 14-12-2011 30 7   Download

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