+publisher:"Agricultural University" +contributor:("J.J. Bogardi")

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1. Milutin, D. Multiunit water resource systems management by decomposition, optimization and emulated evolution : a case study of seven water supply reservoirs in Tunisia.

Degree: 1998, Agricultural University

URL: http://library.wur.nl/WebQuery/wurpubs/43144 ; urn:nbn:nl:ui:32-43144 ; urn:nbn:nl:ui:32-43144 ; http://library.wur.nl/WebQuery/wurpubs/43144

► Being one of the essential elements of almost any water resource system, reservoirs are indispensable in our struggle to harness, utilize and manage natural… (more)

▼ Being one of the essential elements of almost any water resource system, reservoirs are indispensable in our struggle to harness, utilize and manage natural water resources. Consequently, the derivation of appropriate reservoir operating strategies draws significant attention in water resources planning and management. These operational issues become even more important with the ever increasing scale and complexity of water resource systems. In this respect, the primary obstacle in the analysis of a multiple-reservoir-multiple-user water supply system operation is the dimensionality of the problem. Namely, being a sequential decision making process, the operation of a complex reservoir system over a certain period of time can adequately be described only if all the relevant variables and parameters related to possible system state and decision realizations are taken into account. Clearly, this requirement tends to grow rapidly with the size of the system considered. The computational burden expands even more drastically if the processes involved bear unavoidable stochastic characteristics which are, in this study, assumed to be attributed only to reservoir inflows. With regard to the problem in hand, the methods proposed and analyzed in the study can be divided into three major groups. The first group of methods falls into the family of system decomposition approaches within the optimization and/or simulation of the operation of complex systems. The second one involves the assessment of the impact various simulation alternatives may have on the performance of the adopted iterative decomposition algorithms. Finally, the third part includes the application of genetic algorithms for the derivation of the best water allocation patterns within a multiple-reservoir-multiple-user water supply system. The decomposition models proposed and analyzed in this study are known as sequential decomposition methods. Essentially, to reduce the dimensionality of an optimization problem, they split up a complex system into its elementary units (i.e. reservoirs). Subsequently, the operating strategy of the system is derived in an iterative fashion by applying successive optimization, simulation and release allocation analyses to individual system elements. The optimization method employed within all the decomposition models is stochastic dynamic programming (SDP). Due to the inherent discrete nature of SDP operating policies, the iterative, decomposition-based optimization models have a certain "inaccuracy threshold" which directly affects the performance of the system. Therefore, three different simulation alternatives have been employed to assess the possibility of reducing this negative impact of discretization. It is shown that, by allowing limited policy violations within simulation, the system performance can improve significantly relative to the case when the operating policies are strictly followed. Ultimately, a method based on the theory of genetic algorithms (GA) has been employed to derive the… Advisors/Committee Members: J.%20Bogardi%22%29&pagesize-30">J.J. Bogardi.

Subjects/Keywords: dammen; meren; wateropslag; reservoirs; operationeel onderzoek; tunesië; water; Waterbouwkunde; dams; lakes; water storage; reservoirs; operations research; tunisia; water; Hydraulic Engineering; cum laude

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APA (6^th Edition):

Milutin, D. (1998). Multiunit water resource systems management by decomposition, optimization and emulated evolution : a case study of seven water supply reservoirs in Tunisia. (Doctoral Dissertation). Agricultural University. Retrieved from http://library.wur.nl/WebQuery/wurpubs/43144 ; urn:nbn:nl:ui:32-43144 ; urn:nbn:nl:ui:32-43144 ; http://library.wur.nl/WebQuery/wurpubs/43144

Chicago Manual of Style (16^th Edition):

Milutin, D. “Multiunit water resource systems management by decomposition, optimization and emulated evolution : a case study of seven water supply reservoirs in Tunisia.” 1998. Doctoral Dissertation, Agricultural University. Accessed December 10, 2019. http://library.wur.nl/WebQuery/wurpubs/43144 ; urn:nbn:nl:ui:32-43144 ; urn:nbn:nl:ui:32-43144 ; http://library.wur.nl/WebQuery/wurpubs/43144.

MLA Handbook (7^th Edition):

Milutin, D. “Multiunit water resource systems management by decomposition, optimization and emulated evolution : a case study of seven water supply reservoirs in Tunisia.” 1998. Web. 10 Dec 2019.

Vancouver:

Milutin D. Multiunit water resource systems management by decomposition, optimization and emulated evolution : a case study of seven water supply reservoirs in Tunisia. [Internet] [Doctoral dissertation]. Agricultural University; 1998. [cited 2019 Dec 10]. Available from: http://library.wur.nl/WebQuery/wurpubs/43144 ; urn:nbn:nl:ui:32-43144 ; urn:nbn:nl:ui:32-43144 ; http://library.wur.nl/WebQuery/wurpubs/43144.

Council of Science Editors:

Milutin D. Multiunit water resource systems management by decomposition, optimization and emulated evolution : a case study of seven water supply reservoirs in Tunisia. [Doctoral Dissertation]. Agricultural University; 1998. Available from: http://library.wur.nl/WebQuery/wurpubs/43144 ; urn:nbn:nl:ui:32-43144 ; urn:nbn:nl:ui:32-43144 ; http://library.wur.nl/WebQuery/wurpubs/43144

2. Nandalal, K.D.W. Reservoir management under consideration of stratification and hydraulic phenomena.

Degree: 1995, Agricultural University

URL: http://library.wur.nl/WebQuery/wurpubs/29730 ; urn:nbn:nl:ui:32-29730 ; urn:nbn:nl:ui:32-29730 ; http://library.wur.nl/WebQuery/wurpubs/29730

► Reservoirs are the most important components in a water resources system. They are used to store water to extend its temporal availability. The physical,… (more)

▼ Reservoirs are the most important components in a water resources system. They are used to store water to extend its temporal availability. The physical, chemical and biological characteristics of water change when impounded in reservoirs. This implies the possibility of using reservoirs for the control of the quality of water besides merely satisfying the quantity requirement. This study presents several techniques formulated to manage a reservoir when both quantity and quality of water are of interest. In this study salinity is selected to characterize the water quality status. The approaches are demonstrated using data from the Jarreh Reservoir on the Shapur river in Iran. Water in a reservoir is stratified for most of a year due to difference in density caused by temperature, dissolved and suspended solids. Therefore, in a stratified reservoir the quality of water that is interrelated to density varies with depth. Consequently, this feature could be used in the process of reservoir operational policy determination to improve the quality of water supply. The aim of this research is to analyze different approaches regarding the incorporation of this phenomenon into reservoir operational policies and to propose those which require the least increase in mathematical and computational complexity. Initially, two techniques that rely on the natural process of stratification occurring in a reservoir are presented. The first methodology proceeds stepwise in time alternating optimization and simulation of reservoir operation at each time step. A one-dimensional reservoir dynamics simulation model is employed to simulate the stratification of the reservoir. A constrained nonlinear optimization model is used to identify optimum releases. In the optimization step the reservoir is assumed to be equivalent to the parallel configuration of several smaller hypothetical reservoirs, the number of which being equal to the number of outlets. There is no communication among these hypothetical reservoirs. The applicability of the technique is tested for three hydrologically different years and for a continuous period of five years. Incorporation of inflow stochasticity into the methodology is devised through the integration of an optimization model based on Stochastic Dynamic Programming technique. Next, an iterative technique, in which an optimization model and a reservoir stratification simulation model operate interactively, is presented. One iteration cycle comprises the run of the optimization model and the simulation model: i) Reservoir operation is optimized over the entire time period (year); ii) Simulation of stratification is applied over the entire time period. The optimization model is based on Incremental Dynamic Programming technique. In the optimization model, the hypothetical reservoir concept used in the above model is adopted. However, communication between any two adjoining hypothetical reservoirs is allowed in the model. The one-dimensional reservoir dynamics simulation model simulates the stratification… Advisors/Committee Members: J.%20Bogardi%22%29&pagesize-30">J.J. Bogardi.

Subjects/Keywords: dammen; meren; wateropslag; reservoirs; waterbeheer; watervoorraden; computersimulatie; simulatie; simulatiemodellen; hydrologie; water; Waterbouwkunde; dams; lakes; water storage; reservoirs; water management; water resources; computer simulation; simulation; simulation models; hydrology; water; Hydraulic Engineering

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APA (6^th Edition):

Nandalal, K. D. W. (1995). Reservoir management under consideration of stratification and hydraulic phenomena. (Doctoral Dissertation). Agricultural University. Retrieved from http://library.wur.nl/WebQuery/wurpubs/29730 ; urn:nbn:nl:ui:32-29730 ; urn:nbn:nl:ui:32-29730 ; http://library.wur.nl/WebQuery/wurpubs/29730

Chicago Manual of Style (16^th Edition):

Nandalal, K D W. “Reservoir management under consideration of stratification and hydraulic phenomena.” 1995. Doctoral Dissertation, Agricultural University. Accessed December 10, 2019. http://library.wur.nl/WebQuery/wurpubs/29730 ; urn:nbn:nl:ui:32-29730 ; urn:nbn:nl:ui:32-29730 ; http://library.wur.nl/WebQuery/wurpubs/29730.

MLA Handbook (7^th Edition):

Nandalal, K D W. “Reservoir management under consideration of stratification and hydraulic phenomena.” 1995. Web. 10 Dec 2019.

Vancouver:

Nandalal KDW. Reservoir management under consideration of stratification and hydraulic phenomena. [Internet] [Doctoral dissertation]. Agricultural University; 1995. [cited 2019 Dec 10]. Available from: http://library.wur.nl/WebQuery/wurpubs/29730 ; urn:nbn:nl:ui:32-29730 ; urn:nbn:nl:ui:32-29730 ; http://library.wur.nl/WebQuery/wurpubs/29730.

Council of Science Editors:

Nandalal KDW. Reservoir management under consideration of stratification and hydraulic phenomena. [Doctoral Dissertation]. Agricultural University; 1995. Available from: http://library.wur.nl/WebQuery/wurpubs/29730 ; urn:nbn:nl:ui:32-29730 ; urn:nbn:nl:ui:32-29730 ; http://library.wur.nl/WebQuery/wurpubs/29730

3. Lima, de, M.I.P. Multifractals and the temporal structure of rainfall.

Degree: 1998, Agricultural University

URL: http://library.wur.nl/WebQuery/wurpubs/40455 ; urn:nbn:nl:ui:32-40455 ; urn:nbn:nl:ui:32-40455 ; http://library.wur.nl/WebQuery/wurpubs/40455

► Rainfall is a highly non-linear hydrological process that exhibits wide variability over a broad range of time and space scales. The strongly irregular fluctuations… (more)

▼ Rainfall is a highly non-linear hydrological process that exhibits wide variability over a broad range of time and space scales. The strongly irregular fluctuations of rain are difficult to capture instrumentally and to handle mathematically. The purpose of this work is to contribute to a better understanding of the variability of rainfall by investigating the multifractal behaviour that is present in the temporal structure of rainfall. This type of rainfall analysis is based on the invariance of properties across scales, and it takes into account the persistence of the variability of the process over a range of scales. The dissertation focuses on the analyses of point-rainfall data from 4 different locations in Europe. The data sets differ with respect to climatic origin, type of measuring device used, resolution of the data, and length of the records. The data are from recording and non-recording gauges. The highest resolution of the data is 1 minute, and the lowest is 1 month. The time span of the records varies from 4 years to 90 years. The presence of scale-invariant and multifractal properties in the rainfall process are investigated with spectral analysis, and by studying the multiple scaling of probability distributions and statistical moments of the rainfall intensity. This study shows that the temporal structure of rainfall exhibits these properties across a wide range of scales. Within the range of scales studied, it analyzes the presence of different scaling regimes and seasonal variation in the statistics of rainfall. The empirical multifractal scaling exponent functions that describe the statistics of the rainfall process are derived. Special attention is given to discontinuities in the empirical scaling functions that are caused by the finite size of the samples, the divergence of moments, and the dynamic and temporal resolution of the rainfall measuring devices and data. The critical exponents associated with these multifractal phase transitions are studied empirically. The applicability to rainfall of a theoretical multifractal model based on Lévy stochastic variables is studied. The adequacy of this model in describing the empirical scaling functions of rainfall is examined. Results indicate that it is possible to quantify the statistics of rainfall over a wide range of scales, and over a range of the process dynamics using only a few parameters. For an analysis of this type, it is essential to recognize the effects of such limitations as the sample size, and the type of acquisition of the experimental data and its resolution. This dissertation shows that multifractals offer a good framework for the analysis of the temporal structure of rainfall. It provides a good description of both the average and the extreme events. The expectation is that this type of studies will help in solving problems related to the choice of suitable resolutions for data collection and in making a correct assessment of the 'quality' of data sets. Advisors/Committee Members: J.%20Bogardi%22%29&pagesize-30">J.J. Bogardi, J. Grasman.

Subjects/Keywords: regen; hydrologie; statistiek; gegevensverwerking; europa; Meteorologie (algemeen); rain; hydrology; statistics; data processing; europe; Meteorology (General)

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APA (6^th Edition):

Lima, de, M. I. P. (1998). Multifractals and the temporal structure of rainfall. (Doctoral Dissertation). Agricultural University. Retrieved from http://library.wur.nl/WebQuery/wurpubs/40455 ; urn:nbn:nl:ui:32-40455 ; urn:nbn:nl:ui:32-40455 ; http://library.wur.nl/WebQuery/wurpubs/40455

Chicago Manual of Style (16^th Edition):

Lima, de, M I P. “Multifractals and the temporal structure of rainfall.” 1998. Doctoral Dissertation, Agricultural University. Accessed December 10, 2019. http://library.wur.nl/WebQuery/wurpubs/40455 ; urn:nbn:nl:ui:32-40455 ; urn:nbn:nl:ui:32-40455 ; http://library.wur.nl/WebQuery/wurpubs/40455.

MLA Handbook (7^th Edition):

Lima, de, M I P. “Multifractals and the temporal structure of rainfall.” 1998. Web. 10 Dec 2019.

Vancouver:

Lima, de MIP. Multifractals and the temporal structure of rainfall. [Internet] [Doctoral dissertation]. Agricultural University; 1998. [cited 2019 Dec 10]. Available from: http://library.wur.nl/WebQuery/wurpubs/40455 ; urn:nbn:nl:ui:32-40455 ; urn:nbn:nl:ui:32-40455 ; http://library.wur.nl/WebQuery/wurpubs/40455.

Council of Science Editors:

Lima, de MIP. Multifractals and the temporal structure of rainfall. [Doctoral Dissertation]. Agricultural University; 1998. Available from: http://library.wur.nl/WebQuery/wurpubs/40455 ; urn:nbn:nl:ui:32-40455 ; urn:nbn:nl:ui:32-40455 ; http://library.wur.nl/WebQuery/wurpubs/40455

4. Querner, E.P. Aquatic weed control within an integrated water management framework.

Degree: 1993, Agricultural University

URL: http://library.wur.nl/WebQuery/wurpubs/20661 ; urn:nbn:nl:ui:32-20661 ; urn:nbn:nl:ui:32-20661 ; http://library.wur.nl/WebQuery/wurpubs/20661

► Aquatic weed control, carried out by the water boards in the Netherlands, is required to maintain sufficient discharge capacity of the surface water system.… (more)

▼ Aquatic weed control, carried out by the water boards in the Netherlands, is required to maintain sufficient discharge capacity of the surface water system. Weed control affects the conditions of both surface water and groundwater. The physically based model MOGROW was developed to simulate the flow of water in the unsaturated zone, the saturated zone and the water courses in an integrated manner. The model was verified with field data on groundwater levels, discharges, moisture storage in the root zone and evapotranspiration in the Hupselse Beek catchment. The time and frequency of weed control during summer were determined using data on weed growth, flow resistance and discharges. This study was carried out in the Poelsbeek and Bolscherbeek catchments located in the east of the Netherlands. Weed obstruction was measured in nine water courses of these catchments. The boundary roughness coefficient κ _M was calculated from field data and laboratory experiments. The κ _M varied for the unobstructed part of the cross-section between 30-34 m <sup>1/3.</SUP>s ^-1. A numerical model was used to determine the velocity distribution in a cross-section of a water course. This calculated velocity distribution resulted also in κ _M values of the same order. The minimally required weed control was estimated using the data on weed obstruction, flow resistance and estimates of expected discharges. These expected discharges for the summer period were calculated for three water table fluctuation classes, using a one-dimensional groundwater model. Comparing the expected discharges and the permissible flow rates for a water course, gives the required periods of weed control. Weed control strategies were evaluated for the Poelsbeek and Bolscherbeek area using the model MOGROW. Results of the modelling experiments are the occurrence of high surface water levels, high groundwater levels and high stream flow velocities. In a cost-benefit analysis the cost of weed control and the damage for pasture (in terms of financial losses) were considered. Seven simulation years with varying wet conditions in summer were selected. The financial loss resulting from one clearing at the end of summer, was too high for only one of these years. The multi-objective decision method ELECTRE II enabled the ecological impact to be incorporated in the evaluation. The method identified weed control strategies that are most favourable for agriculture or nature conservation. Advisors/Committee Members: R.A. Feddes, J.%20Bogardi%22%29&pagesize-30">J.J. Bogardi.

Subjects/Keywords: sloten; onderhoud; rivieren; waterlopen; kanalen; water; afvoer; hydrodynamica; vloeistoffen (liquids); vloeistoffen (fluids); stroming; kanalen, klein; onkruidbestrijding; waterwegen; schadelijke waterplanten; grondwater; oppervlaktewater; grondwaterspiegel; hydrologie; modellen; analogen; onderzoek; Nederland; watergebruik; Drainage; ditches; maintenance; rivers; streams; canals; water; discharge; hydrodynamics; liquids; fluids; flow; channels; weed control; waterways; aquatic weeds; groundwater; surface water; water table; hydrology; models; analogues; research; Netherlands; water use; Drainage

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APA (6^th Edition):

Querner, E. P. (1993). Aquatic weed control within an integrated water management framework. (Doctoral Dissertation). Agricultural University. Retrieved from http://library.wur.nl/WebQuery/wurpubs/20661 ; urn:nbn:nl:ui:32-20661 ; urn:nbn:nl:ui:32-20661 ; http://library.wur.nl/WebQuery/wurpubs/20661

Chicago Manual of Style (16^th Edition):

Querner, E P. “Aquatic weed control within an integrated water management framework.” 1993. Doctoral Dissertation, Agricultural University. Accessed December 10, 2019. http://library.wur.nl/WebQuery/wurpubs/20661 ; urn:nbn:nl:ui:32-20661 ; urn:nbn:nl:ui:32-20661 ; http://library.wur.nl/WebQuery/wurpubs/20661.

MLA Handbook (7^th Edition):

Querner, E P. “Aquatic weed control within an integrated water management framework.” 1993. Web. 10 Dec 2019.

Vancouver:

Querner EP. Aquatic weed control within an integrated water management framework. [Internet] [Doctoral dissertation]. Agricultural University; 1993. [cited 2019 Dec 10]. Available from: http://library.wur.nl/WebQuery/wurpubs/20661 ; urn:nbn:nl:ui:32-20661 ; urn:nbn:nl:ui:32-20661 ; http://library.wur.nl/WebQuery/wurpubs/20661.

Council of Science Editors:

Querner EP. Aquatic weed control within an integrated water management framework. [Doctoral Dissertation]. Agricultural University; 1993. Available from: http://library.wur.nl/WebQuery/wurpubs/20661 ; urn:nbn:nl:ui:32-20661 ; urn:nbn:nl:ui:32-20661 ; http://library.wur.nl/WebQuery/wurpubs/20661

5. Kularathna, M.D.U.P. Application of dynamic programming for the analysis of complex water resources systems : a case study on the Mahaweli River basin development in Sri Lanka.

Degree: 1992, Agricultural University

URL: http://library.wur.nl/WebQuery/wurpubs/19720 ; urn:nbn:nl:ui:32-19720 ; urn:nbn:nl:ui:32-19720 ; http://library.wur.nl/WebQuery/wurpubs/19720

► The technique of Stochastic Dynamic Programming (SDP) is ideally suited for operation policy analyses of water resources systems. However SDP has a major drawback… (more)

▼ The technique of Stochastic Dynamic Programming (SDP) is ideally suited for operation policy analyses of water resources systems. However SDP has a major drawback which is appropriately termed as its "curse of dimensionality". Aggregation/Disaggregation techniques based on SDP and simulation are presented to analyze a complex water resources system. The system under consideration serves two major purposes: hydropower generation and irrigation. The identification of subsystems by their functional and physical characteristics was an important first step in the analysis. Subsequently each subsystem is represented by a hypothetical composite reservoir to arrive at an operation policy for the interface point of the subsystems. A more detailed analysis which considers the real configurations of the subsystems is performed by following this operation policy of the interface point. Two approaches: sequential optimization and iterative optimization are presented. In these approaches, each subsystem is individually analyzed using two-reservoir SDP models. The applicability of an Implicit Stochastic Approach in which the operation of the system is optimized for a number of deterministic hydrologic data series is also investigated. To complement the aggregation technique of the Composite Reservoir, subsequent disaggregation techniques are proposed. Three different techniques: (1) A statistical disaggregation, (2) An optimization/simulation-based technique, and (3) The disaggregation of the composite policy in the actual operation by incorporating a single-time-step optimization are tested. The accuracy of the sequential and iterative optimization approaches are evaluated by applying them to a subsystem of three reservoirs in a cascade for which the deterministic optimum pattern is also determined by an Incremental Dynamic Programming (IDP) model. In the case of the Implicit Stochastic Approach, the results are compared with the results of the explicit SDP approach and the deterministic optimum operation pattern, in addition to the historical operation pattern of the system. The results of the Composite Policy Disaggregation techniques are compared to the results obtained by real multireservoir optimizations carried out by the use of explicit SDP models. Advisors/Committee Members: J.%20Bogardi%22%29&pagesize-30">J.J. Bogardi, P. van Beek.

Subjects/Keywords: watergebruik; schadepreventie; irrigatie; watervoorziening; waterbeheer; watervoorraden; dynamisch programmeren; markov-processen; sri lanka; modellen; onderzoek; hydrologie; Waterbeheer (algemeen); water use; loss prevention; irrigation; water supply; water management; water resources; dynamic programming; markov processes; sri lanka; models; research; hydrology; Water Management (General)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kularathna, M. D. U. P. (1992). Application of dynamic programming for the analysis of complex water resources systems : a case study on the Mahaweli River basin development in Sri Lanka. (Doctoral Dissertation). Agricultural University. Retrieved from http://library.wur.nl/WebQuery/wurpubs/19720 ; urn:nbn:nl:ui:32-19720 ; urn:nbn:nl:ui:32-19720 ; http://library.wur.nl/WebQuery/wurpubs/19720

Chicago Manual of Style (16^th Edition):

Kularathna, M D U P. “Application of dynamic programming for the analysis of complex water resources systems : a case study on the Mahaweli River basin development in Sri Lanka.” 1992. Doctoral Dissertation, Agricultural University. Accessed December 10, 2019. http://library.wur.nl/WebQuery/wurpubs/19720 ; urn:nbn:nl:ui:32-19720 ; urn:nbn:nl:ui:32-19720 ; http://library.wur.nl/WebQuery/wurpubs/19720.

MLA Handbook (7^th Edition):

Vancouver:

Kularathna MDUP. Application of dynamic programming for the analysis of complex water resources systems : a case study on the Mahaweli River basin development in Sri Lanka. [Internet] [Doctoral dissertation]. Agricultural University; 1992. [cited 2019 Dec 10]. Available from: http://library.wur.nl/WebQuery/wurpubs/19720 ; urn:nbn:nl:ui:32-19720 ; urn:nbn:nl:ui:32-19720 ; http://library.wur.nl/WebQuery/wurpubs/19720.

Council of Science Editors:

Kularathna MDUP. Application of dynamic programming for the analysis of complex water resources systems : a case study on the Mahaweli River basin development in Sri Lanka. [Doctoral Dissertation]. Agricultural University; 1992. Available from: http://library.wur.nl/WebQuery/wurpubs/19720 ; urn:nbn:nl:ui:32-19720 ; urn:nbn:nl:ui:32-19720 ; http://library.wur.nl/WebQuery/wurpubs/19720

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