PubAg

Main content area

You searched for: Source 2017 v.552 Remove constraint Source: 2017 v.552 Subject models Remove constraint Subject: models Text Availability Citation in PubAg Remove constraint Text Availability: Citation in PubAg
Start Over

Search

25  Search Results

« Previous | 1 - 20 of 25 |
Number of results to display per page

Search Results

1. Comparison of random forests and support vector machine for real-time radar-derived rainfall forecasting

Author:
Yu, Pao-Shan; Yang, Tao-Chang; Chen, Szu-Yin; Kuo, Chen-Min; Tseng, Hung-Wei
Source:
Journal of hydrology 2017 v.552 pp. 92-104
ISSN:
0022-1694
Subject:
hydrology; latitude; longitude; models; rain; support vector machines; typhoons; watersheds; Taiwan
Abstract:
... This study aims to compare two machine learning techniques, random forests (RF) and support vector machine (SVM), for real-time radar-derived rainfall forecasting. The real-time radar-derived rainfall forecasting models use the present grid-based radar-derived rainfall as the output variable and use antecedent grid-based radar-derived rainfall, grid position (longitude and latitude) and elevation ...
DOI:
10.1016/j.jhydrol.2017.06.020

2. Contaminant transport in wetland flows with bulk degradation and bed absorption

Author:
Wang, Ping; Chen, G.Q.
Source:
Journal of hydrology 2017 v.552 pp. 674-683
ISSN:
0022-1694
Subject:
absorption; constructed wetlands; environmental degradation; hydrology; models; prediction; solutes
Abstract:
... Ecological degradation and absorption are ubiquitous and exert considerable influence on the contaminant transport in natural and constructed wetland flows. It creates an increased demand on models to accurately characterize the spatial concentration distribution of the transport process. This work extends a method of spatial concentration moments by considering the non-uniform longitudinal solute ...
DOI:
10.1016/j.jhydrol.2017.07.028

3. Coupling fine particle and bedload transport in gravel-bedded streams

Author:
Park, Jungsu; Hunt, James R.
Source:
Journal of hydrology 2017 v.552 pp. 532-543
ISSN:
0022-1694
Subject:
United States Geological Survey; bedload; bedrock; filtration; gravel; hysteresis; models; sand; streams; surface water; water quality; watersheds; California
Abstract:
... Fine particles in the silt- and clay-size range are important determinants of surface water quality. Since fine particle loading rates are not unique functions of stream discharge this limits the utility of the available models for water quality assessment. Data from 38 minimally developed watersheds within the United States Geological Survey stream gauging network in California, USA reveal three ...
DOI:
10.1016/j.jhydrol.2017.07.023

4. Cross-entropy clustering framework for catchment classification

Author:
Tongal, Hakan; Sivakumar, Bellie
Source:
Journal of hydrology 2017 v.552 pp. 433-446
ISSN:
0022-1694
Subject:
entropy; guidelines; models; stream flow; time series analysis; watersheds; Australia
Abstract:
... There is an increasing interest in catchment classification and regionalization in hydrology, as they are useful for identification of appropriate model complexity and transfer of information from gauged catchments to ungauged ones, among others. This study introduces a nonlinear cross-entropy clustering (CEC) method for classification of catchments. The method specifically considers embedding dim ...
DOI:
10.1016/j.jhydrol.2017.07.005

5. Diffuse nitrogen loss simulation and impact assessment of stereoscopic agriculture pattern by integrated water system model and consideration of multiple existence forms

Author:
Zhang, Yongyong; Gao, Yang; Yu, Qiang
Source:
Journal of hydrology 2017 v.552 pp. 660-673
ISSN:
0022-1694
Subject:
afforestation; agricultural management; ammonium; ammonium nitrogen; eutrophication; fertilizer application; fertilizers; financial economics; heat; models; nitrate nitrogen; nitrogen; orchards; paddies; planting; runoff; solar radiation; water quality; watersheds; China
Abstract:
... Agricultural nitrogen loss becomes an increasingly important source of water quality deterioration and eutrophication, even threatens water safety for humanity. Nitrogen dynamic mechanism is still too complicated to be well captured at watershed scale due to its multiple existence forms and instability, disturbance of agricultural management practices. Stereoscopic agriculture is a novel agricultu ...
DOI:
10.1016/j.jhydrol.2017.07.032

6. Ensemble-based data assimilation for operational flood forecasting – On the merits of state estimation for 1D hydrodynamic forecasting through the example of the “Adour Maritime” river

Author:
Barthélémy, S.; Ricci, S.; Rochoux, M.C.; Le Pape, E.; Thual, O.
Source:
Journal of hydrology 2017 v.552 pp. 210-224
ISSN:
0022-1694
Subject:
algorithms; covariance; geometry; hydrodynamics; hydrology; models; rivers; temporal variation; France
Abstract:
... This study presents the implementation and the merits of an Ensemble Kalman Filter (EnKF) algorithm with an inflation procedure on the 1D shallow water model MASCARET in the framework of operational flood forecasting on the “Adour Maritime” river (South West France). In situ water level observations are sequentially assimilated to correct both water level and discharge. The stochastic estimation o ...
DOI:
10.1016/j.jhydrol.2017.06.017

7. Estimating initial conditions for groundwater flow modeling using an adaptive inverse method

Author:
Hassane Maina, F.; Delay, F.; Ackerer, P.
Source:
Journal of hydrology 2017 v.552 pp. 52-61
ISSN:
0022-1694
Subject:
algorithms; aquifers; groundwater; groundwater flow; models; prediction; resource management
Abstract:
... Due to continuous increases in water demand, the need for seasonal forecasts of available groundwater resources becomes inevitable. Hydrogeological models might provide a valuable tool for this kind of resource management. Because predictions over short time horizons are foreseen, the reliability of model outputs depends on accurate estimates of the initial conditions (ICs), as well as the estimat ...
DOI:
10.1016/j.jhydrol.2017.06.041

8. Event-based nonpoint source pollution prediction in a scarce data catchment

Author:
Chen, Lei; Sun, Cheng; Wang, Guobo; Xie, Hui; Shen, Zhenyao
Source:
Journal of hydrology 2017 v.552 pp. 13-27
ISSN:
0022-1694
Subject:
case studies; hydrograph; models; monitoring; nitrogen content; nonpoint source pollution; phosphorus; pollutants; prediction; rain; runoff; watersheds; China
Abstract:
... Quantifying the rainfall-runoff-pollutant (R-R-P) process is key to regulating non-point source (NPS) pollution; however, the impacts of scarce measured data on R-R-P simulations have not yet been reported. In this study, we conducted a comprehensive study of scarce data that addressed both rainfall-runoff and runoff-pollutant processes, whereby the impacts of data scarcity on two commonly used me ...
DOI:
10.1016/j.jhydrol.2017.06.034

9. Groundwater dependence of coastal lagoons: The case of La Pletera salt marshes (NE Catalonia)

Author:
Menció, A.; Casamitjana, X.; Mas-Pla, J.; Coll, N.; Compte, J.; Martinoy, M.; Pascual, J.; Quintana, X.D.
Source:
Journal of hydrology 2017 v.552 pp. 793-806
ISSN:
0022-1694
Subject:
aquifers; biodiversity; coastal water; dry season; ecological function; ecosystem services; ecosystems; evaporation; groundwater; guidelines; humans; ions; lakes; meteorological data; mixing; models; nutrients; phytoplankton; rain; salt marshes; seawater; streams; surface water; surveys; tourism; urban development; water salinity; wells; wildlife management; zooplankton; Spain
Abstract:
... Coastal wetlands are among the most productive ecosystems of the world, playing an important role in coastal defense and wildlife conservation. These ecosystems, however, are usually affected by human activities, which may cause a loss and degradation of their ecological status, a decline of their biodiversity, an alteration of their ecological functioning, and a limitation of their ecosystem serv ...
DOI:
10.1016/j.jhydrol.2017.07.034

10. Identifying seawater intrusion in coastal areas by means of 1D and quasi-2D joint inversion of TDEM and VES data

Author:
Martínez-Moreno, F.J.; Monteiro-Santos, F.A.; Bernardo, I.; Farzamian, M.; Nascimento, C.; Fernandes, J.; Casal, B.; Ribeiro, J.A.
Source:
Journal of hydrology 2017 v.552 pp. 609-619
ISSN:
0022-1694
Subject:
aquifers; climate change; coasts; drilling; electrical resistance; freshwater; geophysics; groundwater; models; physical properties; risk; saline water; saltwater intrusion; tomography; Portugal
Abstract:
... Seawater intrusion is an increasingly widespread problem in coastal aquifers caused by climate changes –sea-level rise, extreme phenomena like flooding and droughts– and groundwater depletion near to the coastline. To evaluate and mitigate the environmental risks of this phenomenon it is necessary to characterize the coastal aquifer and the salt intrusion. Geophysical methods are the most appropri ...
DOI:
10.1016/j.jhydrol.2017.07.026

11. Improving the estimation of complete field soil water characteristic curves through field monitoring data

Author:
Bordoni, M.; Bittelli, M.; Valentino, R.; Chersich, S.; Meisina, C.
Source:
Journal of hydrology 2017 v.552 pp. 283-305
ISSN:
0022-1694
Subject:
drying; equations; evapotranspiration; geomorphology; hydrologic cycle; hysteresis; laboratory techniques; models; monitoring; rain; silty soils; soil horizons; soil pore water; soil water characteristic; soil water storage; temperate zones; water content
Abstract:
... In this work, Soil Water Characteristic Curves (SWCCs) were reconstructed through simultaneous field measurements of soil pore water pressure and water content. The objective was to evaluate whether field-based monitoring can allow for the improvement of the accuracy in SWCCs estimation with respect to the use of laboratory techniques. Moreover, field assessment of SWCCs allowed to: a) quantify th ...
DOI:
10.1016/j.jhydrol.2017.07.004

12. Inferring near surface soil temperature time series from different land uses to quantify the variation of heat fluxes into a shallow aquifer in Austria

Author:
Kupfersberger, Hans; Rock, Gerhard; Draxler, Johannes C.
Source:
Journal of hydrology 2017 v.552 pp. 564-577
ISSN:
0022-1694
Subject:
air temperature; aquifers; bitumen; buildings; diameter; energy flow; forests; grasses; groundwater; heat transfer; land use; lysimeters; mixing; models; pipes; sewage; soil temperature; soil-atmosphere interactions; surface water; temperature profiles; time series analysis; urban areas; water content; water table; Austria
Abstract:
... Different land uses exert a strong spatially distributed and temporal varying signal of heat fluxes from the surface in or out of the ground. In this paper we show an approach to quantify the heat fluxes into a groundwater body differentiating between near surface soil temperatures under grass, forest, asphalt, agriculture and surface water bodies and heat fluxes from subsurface structures like he ...
DOI:
10.1016/j.jhydrol.2017.07.030

13. Integrated water assessment and modelling: A bibliometric analysis of trends in the water resource sector

Author:
Zare, Fateme; Elsawah, Sondoss; Iwanaga, Takuya; Jakeman, Anthony J.; Pierce, Suzanne A.
Source:
Journal of hydrology 2017 v.552 pp. 765-778
ISSN:
0022-1694
Subject:
bibliometric analysis; climate change; decision making; decision support systems; ecology; economics; groundwater; issues and policy; landscapes; models; social sciences; stakeholders; uncertainty
Abstract:
... There are substantial challenges facing humanity in the water and related sectors and purposeful integration of the disciplines, connected sectors and interest groups is now perceived as essential to address them. This article describes and uses bibliometric analysis techniques to provide quantitative insights into the general landscape of Integrated Water Resource Assessment and Modelling (IWAM) ...
DOI:
10.1016/j.jhydrol.2017.07.031

14. Long-term data set analysis of stable isotopic composition in German rivers

Author:
Reckerth, Anne; Stichler, Willibald; Schmidt, Axel; Stumpp, Christine
Source:
Journal of hydrology 2017 v.552 pp. 718-731
ISSN:
0022-1694
Subject:
altitude; dams (hydrology); data collection; deuterium; evaporation; humid zones; hydrologic cycle; hydrologic factors; latitude; longitude; models; river water; rivers; seasonal variation; stable isotopes; subwatersheds; time series analysis; Germany
Abstract:
... Stable isotopes oxygen-18 (18O) and deuterium (2H) are commonly used to investigate hydrological processes in catchments. However, only a few isotope studies have been conducted on a large scale and rarely over long time periods. The objective of this study was to identify the spatial and seasonal variability of isotopic composition in river water and how it is affected by geographical and hydrolo ...
DOI:
10.1016/j.jhydrol.2017.07.022

15. Method to measure soil matrix infiltration in forest soil

Author:
Zhang, Jing; Lei, Tingwu; Qu, Liqin; Chen, Ping; Gao, Xiaofeng; Chen, Chao; Yuan, Lili; Zhang, Manliang; Su, Guangxu
Source:
Journal of hydrology 2017 v.552 pp. 241-248
ISSN:
0022-1694
Subject:
conservation practices; field experimentation; forest soils; forests; hydrology; infiltrometers; land use; macropores; models; nylon; preferential flow; soil profiles; tracer techniques; water conservation; watersheds; China
Abstract:
... Infiltration of water into forest soil commonly involves infiltration through the matrix body and preferential passages. Determining the matrix infiltration process is important in partitioning water infiltrating into the soil through the soil body and macropores to evaluate the effects of soil and water conservation practices on hillslope hydrology and watershed sedimentation. A new method that e ...
DOI:
10.1016/j.jhydrol.2017.06.032

16. Modeling and assessing the function and sustainability of natural patches in salt-affected agro-ecosystems: Application to tamarisk (Tamarix chinensis Lour.) in Hetao, upper Yellow River basin

Author:
Ren, Dongyang; Xu, Xu; Ramos, Tiago B.; Huang, Quanzhong; Huo, Zailin; Huang, Guanhua
Source:
Journal of hydrology 2017 v.552 pp. 490-504
ISSN:
0022-1694
Subject:
Tamarix chinensis; agroecosystems; biodiversity; cropland; drainage; evaporation; evapotranspiration; field experimentation; groundwater; growing season; irrigated farming; irrigation; models; monitoring; rhizosphere; rooting; salt stress; salts; soil; subsurface flow; vegetation; water management; water table; watersheds; Yellow River
Abstract:
... Relatively low-lying zones of natural vegetation within irrigated areas are not only carriers of biodiversity but also dry drainage areas of excess water and salts applied to nearby croplands. It is thus useful to have a correct understanding of the soil water-salt dynamics and plant water use for keeping the sustainability of those natural areas. The HYDRUS-dualKc model that couples the HYDRUS-1D ...
DOI:
10.1016/j.jhydrol.2017.04.054

17. Modeling nonstationary extreme value distributions with nonlinear functions: An application using multiple precipitation projections for U.S. cities

Author:
Um, Myoung-Jin; Kim, Yeonjoo; Markus, Momcilo; Wuebbles, Donald J.
Source:
Journal of hydrology 2017 v.552 pp. 396-406
ISSN:
0022-1694
Subject:
adenosine monophosphate; cities; climate; hydrology; models; time series analysis; United States
Abstract:
... Climate extremes, such as heavy precipitation events, have become more common in recent decades, and nonstationarity concepts have increasingly been adopted to model hydrologic extremes. Various issues are associated with applying nonstationary modeling to extremes, and in this study, we focus on assessing the need for different forms of nonlinear functions in a nonstationary generalized extreme v ...
DOI:
10.1016/j.jhydrol.2017.07.007

18. Multi-objective reservoir operation during flood season considering spillway optimization

Author:
Liu, Xinyuan; Chen, Lu; Zhu, Yonghui; Singh, Vijay P.; Qu, Geng; Guo, Xiaohu
Source:
Journal of hydrology 2017 v.552 pp. 554-563
ISSN:
0022-1694
Subject:
flood control; hydrograph; models; risk; support vector machines; water power; China
Abstract:
... Flood control and hydropower generation are two main functions of Three Gorges Reservoir (TGR) in China. In this study, a multi-objective operation model for TGR considering these two functions was developed. Since the optimal results of reservoir operation are mostly in the form of gross outflow which is hardly used to directly guide reservoir operation, the optimization of spillways operation wa ...
DOI:
10.1016/j.jhydrol.2017.06.044

19. Non-uniform overland flow-infiltration model for roadside swales

Author:
García-Serrana, María; Gulliver, John S.; Nieber, John L.
Source:
Journal of hydrology 2017 v.552 pp. 586-599
ISSN:
0022-1694
Subject:
control methods; data collection; drainage channels; highways; metropolitan areas; models; overland flow; rain; rain intensity; roadsides; saturated hydraulic conductivity; stormwater
Abstract:
... There is a need to quantify the hydrologic performance of vegetated roadside swales (drainage ditches) as stormwater control measures (SCMs). To quantify their infiltration performance in both the side slope and the channel of the swale, a model has been developed for coupling a Green-Ampt-Mein-Larson (GAML) infiltration submodel with kinematic wave submodels for both overland flow down the side s ...
DOI:
10.1016/j.jhydrol.2017.07.014
CHORUS:
10.1016/j.jhydrol.2017.07.014

20. Predicting nitrate discharge dynamics in mesoscale catchments using the lumped StreamGEM model and Bayesian parameter inference

Author:
Woodward, Simon James Roy; Wöhling, Thomas; Rode, Michael; Stenger, Roland
Source:
Journal of hydrology 2017 v.552 pp. 684-703
ISSN:
0022-1694
Subject:
Markov chain; data collection; evapotranspiration; geology; groundwater; heteroskedasticity; models; nitrate nitrogen; nitrates; prediction; rain; stream flow; streams; uncertainty; water quality; watersheds; Germany
Abstract:
... The common practice of infrequent (e.g., monthly) stream water quality sampling for state of the environment monitoring may, when combined with high resolution stream flow data, provide sufficient information to accurately characterise the dominant nutrient transfer pathways and predict annual catchment yields. In the proposed approach, we use the spatially lumped catchment model StreamGEM to pred ...
DOI:
10.1016/j.jhydrol.2017.07.021