scholarly journals A taxonomy of hydrological processes and watershed function

2021 ◽  
Author(s):  
Hilary McMillan
Keyword(s):  
Literature Review ◽  
Hierarchical Structure ◽  
Hierarchical Organization ◽  
Hydrological Processes ◽  
Runoff Generation ◽  
Unique Identifier ◽  
Additional Information ◽  
Natural Watersheds ◽  
Experimental Watersheds

This paper presents a taxonomy (hierarchical organization) of hydrological processes; specifically, runoff generation processes in natural watersheds. Over 120 process names were extracted from a literature review of papers describing experimental watersheds, perceptual models, and runoff processes in a range of hydro-climatic environments. Processes were arranged into a hierarchical structure, and presented as a spreadsheet and interactive diagram. For each process, additional information was provided: a list of alternative names for the same process, a classification into hydrological function (e.g. partitioning, flux, storage, release) and a unique identifier similar to a hashtag. The taxonomy provides a method to label and search hydrological knowledge, thereby facilitating synthesis and comparison of processes across watersheds.

scholarly journals Analyzing catchment behavior through catchment modeling in the Gilgel Abay, Upper Blue Nile River Basin, Ethiopia

2010 ◽  
Vol 14 (10) ◽  
pp. 2153-2165 ◽  
Author(s):  
S. Uhlenbrook ◽  
Y. Mohamed ◽  
A. S. Gragne
Keyword(s):  
Water Resources ◽  
Model Performance ◽  
Computation Time ◽  
Hydrological Processes ◽  
Runoff Generation ◽  
Time Step ◽  
Blue Nile ◽  
Model Transferability ◽  
Catchment Modeling ◽  
Data Limitations

Abstract. Understanding catchment hydrological processes is essential for water resources management, in particular in data scarce regions. The Gilgel Abay catchment (a major tributary into Lake Tana, source of the Blue Nile) is undergoing intensive plans for water management, which is part of larger development plans in the Blue Nile basin in Ethiopia. To obtain a better understanding of the water balance dynamics and runoff generation mechanisms and to evaluate model transferability, catchment modeling has been conducted using the conceptual hydrological model HBV. Accordingly, the catchment of the Gilgel Abay has been divided into two gauged sub-catchments (Upper Gilgel Abay and Koga) and the un-gauged part of the catchment. All available data sets were tested for stationarity, consistency and homogeneity and the data limitations (quality and quantity) are discussed. Manual calibration of the daily models for three different catchment representations, i.e. (i) lumped, (ii) lumped with multiple vegetation zones, and (iii) semi-distributed with multiple vegetation and elevation zones, showed good to satisfactory model performances with Nash-Sutcliffe efficiencies Reff > 0.75 and > 0.6 for the Upper Gilgel Abay and Koga sub-catchments, respectively. Better model results could not be obtained with manual calibration, very likely due to the limited data quality and model insufficiencies. Increasing the computation time step to 15 and 30 days improved the model performance in both sub-catchments to Reff > 0.8. Model parameter transferability tests have been conducted by interchanging parameters sets between the two gauged sub-catchments. Results showed poor performances for the daily models (0.30 < Reff < 0.67), but better performances for the 15 and 30 days models, Reff > 0.80. The transferability tests together with a sensitivity analysis using Monte Carlo simulations (more than 1 million model runs per catchment representation) explained the different hydrologic responses of the two sub-catchments, which seems to be mainly caused by the presence of dambos in Koga sub-catchment. It is concluded that daily model transferability is not feasible, while it can produce acceptable results for the 15 and 30 days models. This is very useful for water resources planning and management, but not sufficient to capture detailed hydrological processes in an ungauged area.

scholarly journals Physically-based modelling of hydrological processes in a tropical headwater catchment (West Africa) – process representation and multi-criteria validation

2006 ◽  
Vol 10 (6) ◽  
pp. 829-847 ◽  
Author(s):  
S. Giertz ◽  
B. Diekkrüger ◽  
G. Steup
Keyword(s):  
Soil Moisture ◽  
Rainy Season ◽  
Overland Flow ◽  
Soil Layer ◽  
Hydrological Processes ◽  
Runoff Generation ◽  
Field Investigations ◽  
Physically Based ◽  
In The Beginning ◽  
Headwater Catchment

Abstract. The aim of the study was to test the applicability of a physically-based model to simulate the hydrological processes in a headwater catchment in Benin. Field investigations in the catchment have shown that lateral processes such as surface runoff and interflow are most important. Therefore, the 1-D SVAT-model SIMULAT was modified to a semi-distributed hillslope version (SIMULAT-H). Based on a good database, the model was evaluated in a multi-criteria validation using discharge, discharge components and soil moisture data. For the validation of discharge, good results were achieved for dry and wet years. The main differences were observable in the beginning of the rainy season. A comparison of the discharge components determined by hydro-chemical measurements with the simulation revealed that the model simulated the ratio of groundwater fluxes and fast runoff components correctly. For the validation of the discharge components of single events, larger differences were observable, which was partly caused by uncertainties in the precipitation data. The representation of the soil moisture dynamics by the model was good for the top soil layer. For deeper soil horizons, which are characterized by higher gravel content, the differences between simulated and measured soil moisture were larger. A good agreement of simulation results and field investigations was achieved for the runoff generation processes. Interflow is the predominant process on the upper and the middle slopes, while at the bottom of the hillslope groundwater recharge and – during the rainy season – saturated overland flow are important processes.

scholarly journals Simulating the Hydrological Processes of a Meso-Scale Watershed on the Loess Plateau, China

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 878 ◽  
Author(s):  
Manman Leng ◽  
Yang Yu ◽  
Shengping Wang ◽  
Zhiqiang Zhang
Keyword(s):  
Land Use ◽  
Sensitivity Analysis ◽  
Loess Plateau ◽  
Swat Model ◽  
Hydrological Processes ◽  
P Value ◽  
Runoff Generation ◽  
The Loess Plateau ◽  
Monthly Streamflow ◽  
Meso Scale

The Soil and Water Assessment Tool (SWAT) model is widely used to simulate watershed streamflow by integrating complex interactions between climate, geography, soil, vegetation, land use/land cover and other human activities. Although there have been many studies involving sensitivity analysis, uncertainty fitting, and performance evaluation of SWAT model all over the world, identifying dominant parameters and confirming actual hydrological processes still remain essential for studying the effect of climate and land use change on the hydrological regime in some water-limited regions. We used hydro-climate and spatial geographical data of a watershed with an area of 3919 km2, located on the Loess Plateau of China, to explore the suitable criterion to select parameters for running the model, and to elucidate the dominant ones that govern the hydrological processes for achieving the sound streamflow simulation. Our sensitivity analysis results showed that parameters not passing the sensitive check (p-value < 0.05) could play a significant role in hydrological simulation rather than only the parameters with p-value lower than 0.05, indicating that the common protocol is not appropriate for selecting parameters by sensitivity screening only. Superior performance of the rarely used parameter SOL_BD was likely caused by a combination of lateral and vertical movement of water in the loess soils due to the run-on infiltration process that occurred for meso-scale watershed monthly streamflow modeling, contrasting with traditionally held infiltration excessive overland flow dominated runoff generation mechanisms that prevail on the Loess Plateau. Overall, the hydrological processes of meso-scale watershed in the region could be well simulated by the model though underestimates of monthly streamflow could occur. Simulated water balance results indicated that the evapotranspiration in the region was the main component leaving the watershed, accounting for 88.9% of annual precipitation. Surface runoff contributed to 63.2% of the streamflow, followed by lateral flow (36.6%) and groundwater (0.2%). Our research highlights the importance for selecting more appropriate parameters for distributed hydrological models, which could help modelers to better comprehend the meso-scale watershed runoff generation mechanism of the Loess Plateau and provide policy makers robust tool for developing sustainable watershed management planning in water-limited regions.

Functional Structure in Sentences: A Performance Analysis

1971 ◽  
Vol 23 (2) ◽  
pp. 214-224 ◽  
Author(s):  
R. A. Kennedy ◽  
A. L. Wilkes
Keyword(s):  
Cluster Analysis ◽  
Performance Analysis ◽  
Hierarchical Structure ◽  
Deep Structure ◽  
Hierarchical Organization ◽  
Surface Structures ◽  
Input Matrix ◽  
Tree Structures ◽  
The Hierarchical Structure ◽  
Identical Performance

Two experiments are reported which attempt to define the groupings of component words within sentences which subjects have committed to memory. The structural groupings are indexed by judgement latencies for pairs of words and these serve as the input matrix for a hierarchical clustering (HC) analysis. It is concluded that when subjects make judgements concerning the forward order of pairs of words, the latencies imply the presence of a hierarchical organization. Although the tree structures obtained do not follow in any detail the surface structures of the sentence types in either experiment, nonetheless when constituent analysis indicates no difference it is accompanied by identical performance structures, and when a surface distinction is called for, an appropriate difference is found in the tree diagrams produced by cluster analysis. Deep structure differences involving the rearrangement of component words are not found in the hierarchical structure subjects imposed. The pausing patterns followed by subjects when reading the sentences are shown to relate to the structural diagrams generated by the HC analysis.

Marketing Literature Review

2000 ◽  
Vol 64 (3) ◽  
pp. 102-114
Author(s):  
Myron Leonard
Keyword(s):  
Literature Review ◽  
Database Marketing ◽  
Marketing Literature ◽  
Additional Information ◽  
Ann Arbor ◽  
Literature Database ◽  
Selection Of

This section is based on a selection of article abstracts from a comprehensive business literature database. Marketing-related abstracts from over 125 journals (both academic and trade) are reviewed by JM staff. Descriptors for each entry are assigned by JM staff. Each issue of this section represents three months of entries into the database. JM thanks UMI for use of the ABI/INFORM business database. Each entry has an identifying number. Cross-references appear immediately under each subject heading. The following article abstracts are available online from the ABI/INFORM database, which is published and copyrighted by UMI. For additional information about access to the database or about obtaining photocopies of the articles abstracted here, please call (800) 626-2823 or write to UMI, 300 N. Zeeb Rd., Ann Arbor, MI 48106.

Corticosteroids in Tuberculosis

1996 ◽  
Vol 30 (11) ◽  
pp. 1298-1303 ◽  
Author(s):  
Jennifer R Cisneros ◽  
Kim M Murray
Keyword(s):  
Literature Review ◽  
Corticosteroid Therapy ◽  
Case Reports ◽  
Data Extraction ◽  
Individual Case ◽  
Extensive Literature ◽  
Concomitant Disease ◽  
Rapid Reduction ◽  
Medline Search ◽  
Additional Information

OBJECTIVE: TO examine the effects of corticosteroids used for concomitant disease states in patients with latent or active tuberculosis (TB). The role of corticosteroids in the treatment of extrapulmonary TB is also discussed. DATA SOURCES: A MEDLINE search was conducted for the years 1953-1995. The International Pharmaceutical Abstracts service was also used to conduct an extensive literature review. In addition, relevant articles were cross-referenced to screen for additional information. STUDY SELECTION/DATA EXTRACTION: During the literature review, emphasis was placed on human studies and individual case reports. DATA SYNTHESIS: The resurgence of TB in this decade has affected many populations, especially immunocompromised patients. These patients may need corticosteroid therapy for various concomitant diseases that might predispose a patient to develop primary TB infection or reactivate latent TB infection. In appropriate patients, prophylaxis with isoniazid is recommended. Corticosteroid therapy may benefit patients with some forms of extrapulmonary TB. After steroid therapy, improved survival and more rapid reduction of tuberculous symptoms have been noted in cases of tuberculous pleurisy, endobronchial TB, tuberculous meningitis, and tuberculous pericarditis. Corticosteroids may also be useful in controlling both fever and hypersensitivity reactions in pulmonary and extrapulmonary TB, although not routinely used for this purpose. CONCLUSIONS: Corticosteroids may play an important role in TB infection by promoting reactivation of latent infection. Corticosteroids may modify symptoms of some forms of extrapulmonary TB, although randomized, placebo-controlled studies are needed before corticosteroids will have a definitive place in the standard therapy of TB.

Advancement in Research of Hydrological Processes Simulation for Karst Region and Future Challenges

2012 ◽  
Vol 518-523 ◽  
pp. 4104-4110
Author(s):  
Xian Meng Meng ◽  
Bang Yang ◽  
Xian Wu Xue
Keyword(s):  
Water Resources ◽  
Karst Aquifer ◽  
Simulation Method ◽  
Scientific Basis ◽  
Hydrological Processes ◽  
Karst Region ◽  
Runoff Generation ◽  
Aquifer System ◽  
Mechanism Model ◽  
Macro Scale

Hydrological processes simulation is an effective way for water resources evaluation and can provide scientific basis for sustainable utilization of water resources and ecological environment restoration. Compared with traditional watershed hydrological processes, hydrological processes in karst region have their unique in runoff generation and concentration stage because of the complexity and multiplicity of karst aquifer system. This paper reviews the two stages of hydrological processes simulation method in karst region: 1. systematic simulation model stage; 2. process based mechanism model stage. By analyzing the characteristics and limitation of two kinds of models, the tendency of future karst hydrological processes simulation method in two aspects are discussed: 1. quasi physically based model balancing physical senses and data richness; 2. scale adaptable model based on macro-scale applicable equations.

Marketing Literature Review

2000 ◽  
Vol 64 (2) ◽  
pp. 109-121
Author(s):  
Myron Leonard
Keyword(s):  
Literature Review ◽  
Database Marketing ◽  
Marketing Literature ◽  
Additional Information ◽  
Ann Arbor ◽  
Literature Database ◽  
Selection Of

This section is based on a selection of article abstracts from a comprehensive business literature database. Marketing-related abstracts from over 125 journals (both academic and trade) are reviewed by JM staff. Descriptors for each entry are assigned by JM staff. Each issue of this section represents three months of entries into the database. JM thanks UMI for use of the ABI/INFORM business database. Each entry has an identifying number. Cross-references appear immediately under each subject heading. The following article abstracts are available online from the ABI/INFORM database, which is published and copyrighted by UMI. For additional information about access to the database or about obtaining photocopies of the articles abstracted here, please call (800) 626-2823 or write to UMI, 300 N. Zeeb Rd., Ann Arbor, MI 48106.

scholarly journals Physically-based modelling of hydrological processes in a tropical headwater catchment in Benin (West Africa) – process representation and multi-criteria validation

2006 ◽  
Vol 3 (2) ◽  
pp. 595-651 ◽  
Author(s):  
S. Giertz ◽  
B. Diekkrüger ◽  
G. Steup
Keyword(s):  
Soil Moisture ◽  
Rainy Season ◽  
Overland Flow ◽  
Soil Layer ◽  
Hydrological Processes ◽  
Runoff Generation ◽  
Field Investigations ◽  
Physically Based ◽  
In The Beginning ◽  
Headwater Catchment

Abstract. The aim of the study was to test the applicability of a physically-based model to simulate the hydrological processes in a headwater catchment in Benin. Field investigations in the catchment have shown that lateral processes as surface runoff and interflow are most important. Therefore the 1-D SVAT-model SIMULAT was modified to a hillslope version (SIMULAT-H). Due to a good database the model was evaluated in a multi-criteria validation using discharge, discharge components and spatially distributed soil moisture data. For the validation of discharge good results were achieved for dry and wet years. Main differences were observable in the beginning of the rainy season. The comparison of the discharge components determined by hydrochemical measurements with the simulation revealed that the model simulated the ratio of groundwater fluxes and fast runoff components correctly. For the validation of the discharge components of single events larger differences were observable, which was partly caused by uncertainties in the precipitation data. The representation of the soil moisture dynamics by the model was good for the top soil layer. For deeper soil horizons, which are characterized by higher gravel content, the differences between simulated and measured soil moisture were larger. Concerning the runoff generation processes a good agreement of simulation results and field investigations was achieved. On the upper and the middle slope interflow is the predominant process, while at the bottom of the hillslope groundwater recharge and – during the rainy season – saturated overland flow are important processes.

scholarly journals Investigation of factors contributing to accumulation of sediments in stormwater management ponds

2021 ◽  
Author(s):  
Sidra Yasir Siddiqui
Keyword(s):  
Literature Review ◽  
Stormwater Management ◽  
Sediment Accumulation ◽  
Relevant Information ◽  
Data Driven ◽  
Accumulation Rates ◽  
Additional Information ◽  
Modelling Approach

The purpose of this study was to investigate factors contributing to sediment accumulation rates in Stormwater Management ponds. For the purpose of this study almost fifty municipalities in Ontario were contacted and in collaboration with five of those municipalities this study was conducted. A questionnaire was developed and sent to municipalities through email and followup with in-person meetings were conducted. After collecting data and analyzing various characteristics of sediment accumulation rates in SWM ponds, a database was developed to systematically record the relevant information. Additional information on pond properties and drainage areas was sought through a questionnaire and meeting with stormwater managers, and supplemented with historic information. Data collected and used in the study was anonymized in all resulting publications. The calculated accumulated rates from the provided data were compared against the values extracted from the literature review. The developed approach will serve in the development of data-driven modelling approach in SWM ponds.

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