Hydrology Articles

541 Results found
  • Category: Soil & Groundwater ×

  • Subcategory: Hydrology ×

El Niño/La Niña Update: Current Situation and outlook

by World Meteorological Organization (WMO)  (Sep. 8, 2014)

Despite warming of the Tropical Pacific Ocean up until June, the overlaying atmosphere largely failed to respond. As a result, ocean temperature anomalies along the equator have decreased over the past two months. Changes in the wind patterns in early-August brought some weak re-warming, but winds have now returned to near normal in the western ...

Statistical attribution analysis of the nonstationarity of the annual runoff series of the Weihe River

by IWA Publishing  (Sep. 17, 2014)

Time-varying moments models based on Pearson Type III and normal distributions respectively are built under the generalized additive model in location, scale and shape (GAMLSS) framework to analyze the nonstationarity of the annual runoff series of the Weihe River, the largest tributary of the Yellow River. The detection of nonstationarities in ...

The impact of digital elevation model and land use spatial information on Hydrologic Simulation Program-FORTRAN – predicted stream flow and sediment uncertainty

by IWA Publishing  (Sep. 25, 2014)

The Hydrologic Simulation Program-FORTRAN (HSPF) model is widely used to develop management strategies for water resources. The spatial resolution of the input data used to parameterize the HSPF model may lead to uncertainty in model outputs. In this study, we evaluated the impact of the spatial resolution of the digital elevation model (DEM) and ...

Assessment of rain-gauge networks using a probabilistic GIS based approach

by IWA Publishing  (Aug. 12, 2014)

Rain-gauge networks provide estimates of areal rainfall as a crucial input for hydrological applications. Hence, it is important to quantify the performance of a rain-gauge network and evaluate the contribution of each rain-gauge to the overall accuracy of areal rainfall estimation at basin scale. This paper evaluates the performance and ...

Groundwater recharge and discharge analysis for land use conditions suitable for the hydrology and ecology of semiarid regions

by IWA Publishing  (Aug. 12, 2014)

Land use is critical for the hydrology of arid/semiarid regions with fragile/valuable ecosystems. Using Western Jilin as proxy for arid/semiarid, four land use conditions were investigated for the sustainability of fragile/valuable ecosystems – land use conditions for 1930 (pre-development), 2010 (post-development), forestland and ...

An investigation on the effect of geometric shape of streams on stream/ground water interactions and ground water flow

by IWA Publishing  (Aug. 12, 2014)

Ground water should be used efficiently and improved for sustainable water management plans. For this purpose, comprehensive ground water flow models are developed incorporating surface/ground water interactions. Typically, these models require a significant amount of hydrological parameters and the sensitivities of these parameters on ...

Leaf area index as a function of precipitation within a hydrological model

by IWA Publishing  (Aug. 12, 2014)

The Leaf Area Index (LAI) was derived from the Normalised Difference Vegetation Index (NDVI) obtained from Advanced Very High Resolution Radiometer (AVHRR) data for the years 1982–2004. The NDVI-derived LAI showed a very good agreement (correlation coefficient r up to 0.96) with MODIS LAI. To address the relation between precipitation and ...

Improving the accuracy of a grid-based distributed hydrological model using slope and river length corrections in a large river basin: case Mekong

by IWA Publishing  (Aug. 12, 2014)

The effect of the grid cell size on a distributed hydrological model performance was investigated using five grid resolutions (1, 5, 10, 20 and 50 km) in a model for the Mekong Basin in Southeast Asia. Two main factors affecting computation results and related to topography and the grid cell size were identified: the terrain slope decreases and ...

Evapotranspiration estimate from water balance closure using satellite data for the Upper Yangtze River basin

by IWA Publishing  (Aug. 12, 2014)

Application of hydrological models for water resources management at large continental river basins is often limited by the scarcity of in situ meteorological forcing data. Remote sensing information provides an alternative to in situ data, with observations that are, in some cases, at higher spatial and temporal resolutions than those available ...

Similarity-based error prediction approach for real-time inflow forecasting

by IWA Publishing  (Aug. 12, 2014)

Regardless of extensive researches on hydrologic forecasting models, the issue of updating the outputs from forecasting models has remained a main challenge. Most of the existing output updating methods are mainly based on the presence of persistence in the errors. This paper presents an alternative approach to updating the outputs from ...

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