نتایج جستجو برای: streamflow

تعداد نتایج: 3914  

2015
C. Teutschbein T. Grabs R. H. Karlsen H. Laudon K. Bishop

In this paper we combined a multimodel ensemble based on 15 regional climate models with a multicatchment approach to explore the hydrologic sensitivity of 14 neighboring and rather similar catchments to changing climate conditions. Current (1982–2010) and future (2062–2090) streamflow was simulated with the HBV model. A diagnostic approach was used, which considered major behavioral catchment ...

Journal: :Environmental Modelling and Software 2001
Teemu Kokkonen Harri Koivusalo Tuomo Karvonen

A semi-distributed hydrological model was applied to a small forested catcment in southern Finland. The aim was to demonstrate how differences in terrain properties could be taken into account in modelling runoff generation, and to test how well the presented model simulated streamflow with only limited calibration. Modelling was based on subdivision of a catchment into topographically similar ...

2016
Jaewon Kwak Soojun Kim Gilho Kim Vijay P. Singh Hung Soo Kim Athanasios Loukas

Long-term streamflow data are vital for analysis of hydrological droughts. Using an artificial neural network (ANN) model and nine tree-ring indices, this study reconstructed the annual streamflow of the Sacramento River for the period from 1560 to 1871. Using the reconstructed streamflow data, the copula method was used for bivariate drought analysis, deriving a hydrological drought return per...

2002
S. A. Wooldridge

56 Low-yielding catchments with ephemeral streams provide a stern test of the capability of conceptual catchment models for 57 predicting the hydrologic response of the natural landscape. Sustained periods of little or no flow mean that the information content 58 of the streamflow time-series for parameter estimation is limited. During periods with no streamflow, such ephemeral catchments 59 al...

2010
GUOXIANG YANG LAURA C. BOWLING KEITH A. CHERKAUER BRYAN C. PIJANOWSKI

Impervious surface area (ISA) has different surface characteristics from the natural land cover and has great influence on watershed hydrology. To assess the urbanization effects on streamflow regimes, the authors analyzed the U.S. Geological Survey (USGS) streamflow data of 16 small watersheds in the White River [Indiana (IN)] basin. Correlation between hydrologic metrics (flow distribution, d...

Journal: :آب و خاک 0
زارعی زارعی حبیب نژاد روشن حبیب نژاد روشن شاهدی شاهدی قنبرپور قنبرپور

abstract major of hydrological systems are very complicated and it is not possible to understand them completely, therefore simplification is necessary to understand or control of a part of the system behavior such as water balance relationships. hydrological models are simple structure of complicated systems in water cycle in the nature. the first goal of a hydrological model is function predi...

2004
Z. X. XU

Water resources availability for meeting reservoir storage, water supply diversion, and environmental instream flow requirements must be assessed based on various premises regarding future water uses as well as climatic and hydrological conditions. This study, therefore, investigates the possible association between climate change and water resources variability, and detects the plausible long-...

INTRODUCTION Hydrologic drought in the sense of deficient river flow is defined as the periods that river flow does not meet the needs of planned programs for system management. Drought is generally considered as periods with insignificant precipitation, soil moisture and water resources for sustaining and supplying the socioeconomic activities of a region. Thus, it is difficult to give a univ...

2016
Fabrizio Fenicia Dmitri Kavetski Hubert H. G. Savenije Laurent Pfister

This paper explores the development and application of distributed hydrological models, focusing on the key decisions of how to discretize the landscape, which model structures to use in each landscape element, and how to link model parameters across multiple landscape elements. The case study considers the Attert catchment in Luxembourg—a 300 km mesoscale catchment with 10 nested subcatchments...

2008
P. P. Mujumdar Subimal Ghosh

[1] Climate change impact assessment on water resources with downscaled General Circulation Model (GCM) simulation output is characterized by uncertainty due to incomplete knowledge about the underlying geophysical processes of global change (GCM uncertainties) and due to uncertain future scenarios (scenario uncertainties). Disagreement between different GCMs and scenarios in regional climate c...

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