As research has expanded on the environmental impact of stormwater on receiving ecosystems more focus is now being put on the quality issues of stormwater. Biofilters are one of many nature-based solutions that have been developed for that purpose and are also the subject of this study. In order to plan and implement biofilters, predictive models can be useful tools to forecast their performance on a given site. The aim of this study was to investigate the possibilities and limitations of modelling the treatment of stormwater in a biofilter using MIKE+. This was done by first trying to model the hydrological conditions of a biofilter from a study site in Sundsvall and thereafter coupling a water treatment model created in ECO Lab.  The results showed that there were some notable differences between the parameters affecting the hydrological flow in reality and what is currently possible to model in MIKE+. It was seen that the Soakaway node used to model biofilters needs to be complexified in order to properly model the hydrological conditions of biofilters. The main improvements required are that the flow attenuation should occur within the Soakaway node rather than before or after and that it should be based on soil properties. The retention volume also needs to be integrated in the node and a varying exfiltration rate is believed to be required to fit the varying nature of evapotranspiration.  The hydrological model was seen to have a great impact on the water treatment model and some limitations with the program and the used model were identified. Regarding ECO Lab, the program is currently unable to consider interevent processes when the biofilter is empty. These processes can however be of great importance for some contaminants. The program also assumes a time dependency whereas it has been seen that a short retention time may be sufficient to achieve good reduction efficiency. The model used is a highly lumped conceptual model with few parameters so further research aiming at the creation of correction factors for the main affecting parameters is believed to be required in order to avoid design specific calibration. Calibration should also occur over a longer time period in order to consider the variability of stormwater. / I takt med att forskningen kring dagvattens miljöpåverkan på mottagande ekosystem avancerats har hanteringen av dagvatten gått från att enbart fokusera på dess kvantitet till att även fokusera på dess kvalitet. Biofilter är en av flera naturbaserade lösningar som utvecklats för detta ändamål. För att kunna planera och implementera biofilter kan prediktiva modeller vara användbara verktyg för att förutse deras prestanda i ett tilltänkt område. Syftet med denna studie var att undersöka möjligheterna att modellera dagvattenreningen i ett biofilter med hjälp av MIKE+. Detta gjordes genom att först försöka modellera de hydrologiska förhållandena i ett biofilter från ett studieområde i Sundsvall och därefter koppla en vattenreningsmodell skapad i ECO Lab.  Resultatet visade att det finns några märkbara skillnader mellan de parametrar som påverkar det hydrologiska flödet i biofilter i verkligheten och vad som för närvarande är möjligt att modellera i MIKE+. Det visades att Soakaway-noden som används för att modellera biofilter behöver utvecklas för att kunna modellera de hydrologiska förhållandena på ett korrekt sätt. De främsta förbättringar som krävs är att flödesdämpningen bör ske inom Soakaway-noden snarare än innan eller efter och att denna flödesdämpning bör baseras på filtrets markegenskaper. Retentionsvolymen behöver dessutom integreras i noden och en varierande exfiltrationshastighet tros krävas för att kunna ta hänsyn till hur evapotranspiration varierar över tid.  Den hydrologiska modellen sågs ha stor inverkan på vattenreningsmodellen och vissa begränsningar kunde visas hos programmet och den använda modellen. När det gäller ECO Lab kan programmet för närvarande inte ta hänsyn till processer mellan event när biofiltret är tomt. Dessa processer kan dock ha stor betydelse för vissa föroreningar. Programmet förutsätter också ett tidsberoende trots att forskning visat att en kort uppehållstid kan vara tillräcklig för att uppnå god reningseffekt. Modellen som används är en mycket enkel konceptuell modell med få parametrar så vidare forskning rekommenderas med syfte att skapa korrektionsfaktorer för att bättre ta hänsyn till de viktigaste reningsfaktorer och undvika platsspecifik kalibrering. Kalibreringen bör även ske under en längre tidsperiod för att ta hänsyn till variationerna i dagvatten.

Understanding water temperature dynamics in lakes is essential for ecological and environmental management. This study focuses on Lake Erken, Sweden, aiming to develop and validate a three-dimensional (3D) hydrodynamic model using the MIKE 3 FM modelling system to simulate the lake's water temperature distribution. The model performance was evaluated by comparing simulated water temperature profiles with observed data at various depths, distinguishing between the upper layer and deeper layers. Results showed satisfactory performance, with the model capturing seasonal and spatial variations in the lake’s thermal structure. The root-mean-square error (RMSE) for water temperature simulation ranged between 0.7-1.8°C, and the Nash-Sutcliffe efficiency (NSE) was between 0.86-0.99 across different depths. However, the model has limitations in accurately capturing stratification in deeper layers, especially during the summer months. This research underscores the importance of accurate temperature modelling for understanding lake ecosystems and provides insights for future improvements in hydrodynamic simulations.

Den här studien har sökt kartlägga och kvantifiera hur olika metoder att ansätta avrinningskoefficienter påverkar simuleringsresultaten vid hydraulisk modellering av spillvattenförande ledningssystem. Olika metoder att ansätta avrinningskoefficienter tillämpades på två modellområden av olika karaktär. Varje modellområde bestod av mindre delavrinningsområden kopplade till en ledningsnätsmodell i modellverktyget MIKE URBAN. I MIKE URBAN kopplas ledningssegment i ledningsnätsmodellen samman av noder, även tillrinningen från modellområdets delavrinningsområden har sitt inlopp i dessa noder. Noderna kan motsvara nedstigningsbrunnar, tillsynsbrunnar och rännstensbrunnar i det verkliga ledningsnätssystemet (Blomquist et al. 2016). Skillnader i absolut maximalt nodvattendjup mellan olika metoder att ansätta avrinningskoefficienter visualiserades i kartbilder. Resultaten visade att det uppstod skillnader i ledningsnätsmodellernas maximala simulerade nodvattendjup när olika metoder att ansätta avrinningskoefficienter användes. Med regressionsanalyser undersöktes samband mellan relativ förändring i reducerad area och relativ förändring i simulerade maximala nodvattendjup mellan olika metoder att ansätta avrinningskoefficienter. För noder längst uppströms i ledningssystemet påvisades ett positivt linjärt samband mellan relativ förändring i maximalt nodvattendjup och relativ förändring i ansluten reducerad area. Sambandet mellan relativ förändring i maximalt nodvattendjup och relativ förändring i reducerad area skiljde sig i styrka för olika modellsimuleringar. För modellområde J som har ett helt separerat spillvattennät och en homogen bebyggelse låg förklaringsgraden på omkring 50 procent för samtliga modellscenarier. I samtliga modellscenarier för modellområde J låg det maximala nodvattendjupet över nedströms ledningshjässa vilket kan tyda på att begränsningar i ledningsdimensioner har inverkan på det maximala simulerade nodvattendjupet. För modellområde E var sambandet mellan relativ förändring i maximalt nodvattendjup och relativ förändring i ansluten reducerad area starkare än för modellområde J för en majoritet av simuleringsscenarierna. Resultaten bör betraktas utifrån studiens begränsade omfattning samt utifrån att modellerna är teoretiska då de inte kalibrerats mot mätdata. Studien visualiserar dock att beroende på vilken metod som använts för att ansätta avrinningskoefficienter kan skillnader i simuleringsresultat bli stora för vissa delar av modellområdet. Fortsatta studier är därför viktiga för en ökad transparens vid hydraulisk modellering av ledningsnätssystem och för att tydliggöra osäkerheter som är kopplade till avrinningskoefficienter.

This study evaluated the impacts of shallow and deep open drains on groundwater levels and drain performance under varying climate scenarios and irrigation application rates. The MIKE SHE model used for this study is an advanced and fully spatially distributed hydrological model. Three drain depths, climates and irrigation application rates were considered. The drains depths included 0, 1 and 2 m deep drains. The annual rainfall and meteorological data were collected from study area from 1976 to 2004 and analysed to identify the typical wet, average and dry years within the record. Similarly three irrigation application rates included 0, 10 and 16 ML/ha-annum. All together twenty seven scenarios (3 drains depths, 3 climates and 3 irrigation application rates) were simulated. The observed soil physical and hydrological data were used to calibrate and validate the model. Mean square error (R[superscript]2) of the simulated and observed water table data varied from 0.7 to 0.87. Once validated the MIKE SHE model was used to evaluate the effectiveness of 1 and 2 metre deep drains. The simulated water table depth, unsaturated zone deficit, exchange between unsaturated and saturated zones, drain outflow and overland flow were used to analyse their performance. The modeling results showed that the waterlogging was extensive and prolonged during winter months under the no drainage and no irrigation scenario. In the wet climate scenario, the duration of water logging was longer than in the average climate scenario during the winter months. In the dry climate scenario no waterlogging occurred during the high rainfall period. The water table reached soil surface during the winter season in the case of wet and average climate. For the dry climate, the water table was about 0.9 metres below soil surface during winter. / One and 2 metre deep drains lowered the water table up to 0.9 and 1.8 metres in winter for the wet climate when there was no irrigation application. One metre deep drains proved effective in controlling water table during wet and average climate without application of irrigation water. One metre deep drains were more effective in controlling waterlogging a in wet, average and dry years when the irrigation application rate was 10 ML/ha-annum. With 16 ML/ha-annum irrigation application, 1 metre deep drains did not perform as efficiently as 2 metre deep drains in controlling the water table and waterlogging. In the dry climate scenario, without irrigation application, 1 metre deep drains were not required as there was not enough flux from rainfall and irrigation to raise the water table and create waterlogging risks. Two metre deep drains lowered the water table to greater depths in the wet, average and dry climate scenarios respectively when no irrigation was applied. They managed water table better in wet and average climate with 10 and 16 ML/ha-annum irrigation application rate. Again in the dry climate, without irrigation application 2 metre deep drains were not required as there was a minimal risk of waterlogging. The recharge to the groundwater table in the no drainage case was far greater than for the 1 and 2 metre deep drainage scenarios. The recharge was higher in case of 1 metre deep drains than 2 metre deep drains in wet and average climate during winter season. / There was no recharge to ground water with 1 and 2 metre deep drains under the dry climate scenarios and summer season without irrigation application as there was not enough water to move from the ground surface to the unsaturated and saturated zones. When 10 ML/ha-annum irrigation rate was applied during wet, average and dry climate respectively, 1 metre deep drains proved enough drainage to manage the recharge into the groundwater table with a dry climate. For the wet and average climate scenarios, given a 10 ML/ha-annum irrigation application rate, 2 metre deep drains managed recharge better than 1 metre deep drains. Two metres deep drains with a 10 ML/ha-annum irrigation application rate led to excessive drainage of water from the saturated zone in the dry climate scenario. Two metres deep drains managed recharge better with a 16 ML/ha-annum irrigation application rate in the wet and average climate scenarios than the 1 metre deep drains. Two metres deep drains again led to excessive drainage of water from the saturated zone in dry climate. In brief, 1 metre deep drains performed efficiently in the wet and average climate scenarios with and without a 10 ML/ha-annum irrigation application rate. One metre deep drains are not required for the dry climate scenario. Two metre deep drains performed efficiently in the wet and average climate scenarios with 16 ML/ha-annum irrigation application rate. Two metre deep drains are not required for the dry climate scenario.

The type of commentary a narrative is able to make is fully dependant on the type of narrator who is relating it. The visual elements present in a film are the true narrational forces which guide it. The presence of the camera, the use of lighting, the architecture, and the objects present in the film each have their own meaning. These elements come together to make a greater commentary than the dialogue. How these meanings interact with each other is what defines what type of narrator is present in the film. By analyzing what type of narrator is relating the story it is possible to examine what commentary the film is able to make. Mike Nichols? 1967 film The Graduate and Terry Gilliam?s 1998 film adaptation of Hunter S. Thompson?s 1971 literary work Fear and Loathing in Las Vegas make commentaries that act as bookends for the ideals of the youth culture during the late 1960?s. Where as The Graduate is condemning the shining emptiness of 1967 suburban California society which its narrator inhabits, Fear and Loathing?s narrator is depicting the twisted abomination which grew within the emptiness of that society during those four years. The fact that Gilliam?s adaptation came 27 years after the source material was created allows for an even more specific translation of Thompson?s message. The Graduate is looking towards the unknown future where as Fear and Loathing is look backwards at the results. The Graduate is commenting on the current situation and looking forwards where as Fear and Loathing is looking backwards to see what has happened in the interim. It is this difference that forces the type of narration and the visual style employed by the films to be diametrically opposed.

On the Blue Nile in Sudan, near the Ethiopian border, there is a measurement station named El Deim. The discharge assessments carried out at this station are crucial for the water resource management in Sudan. Due to changed conditions, caused by a heightening of the downstream-located Roseires dam, new methods for discharge assessment are needed. The objective of the present study was to examine possibilities and methodologies to assess the discharge at this station. The flow dynamics was examined through steady state as well as dynamic hydraulic modeling by use of the Mike 11 modeling software package. By simulating possible future scenarios, in the aspect of discharge variations in the Blue Nile and water level variations in the reservoir, the effects from the raised dam on El Deim could be studied. The model was based on bathymetrical data in form of cross sections. As boundary conditions for the simulation, measured and synthetic data series of discharge and water levels were used. The known measured water levels at El Deim were compared with the simulated water levels at El Deim for the same discharge scenarios. The modeled value corresponds well to the measured values. The existing discrepancies between the simulated and measured values are likely caused by insufficient bathymetrical data.   Simulation results show that the flow dynamics at El Deim are highly dependent on the water level of the reservoir and the discharge’s rate of variation. Accordingly, rating curves were created for a range of water levels at the reservoir. With the use of these curves, and tables/equations based on them, the discharge can be rated by knowing the water level at the Roseires dam and El Deim. However, the results from this study are more a description of the principles of how the discharge ratings could be performed. If the methodology and rating tools from this study are planned to be implemented the model must be improved with more bathymetrical data. The improvements are needed to create more accurate curves, tables and equations for discharge rating. Discharge ratings can then be produced and enable better operation of Roseires dam and a more efficient use of the valuable water resources in Sudan. In order to test the applicability of the created model and produced rating tools they should be compared with new measurement data from El Deim with the heightened Roseires dam fully implemented.   It is possible to assess the discharge at El Deim even when backwater effects affect the station. The methodology developed in this thesis would be applicable for similar studies at other locations.

Thesis (Ph. D.)--Florida State University, 2005. / Advisor: S. E. Gontarski, Florida State University, College of Arts and Sciences, Dept. of English. Title and description from dissertation home page (viewed Jan. 24, 2006). Document formatted into pages; contains v, 159 pages. Includes bibliographical references.

Αντικείμενο της παρούσας εργασίας αποτελεί η εφαρμογή του μοντέλου βροχής-απορροής MIKE-SHE στο ορεινό τμήμα της λεκάνης του Γλαύκου. Σκοπός της μελέτης ήταν η διαμόρφωση της εσωτερικής δομής του MIKE-SHE έτσι ώστε να προσομοιώνει την διαδικασία της απορροής στην λεκάνη του Γλαύκου, η βαθμονόμηση των παραμέτρων του και η σύγκριση των αποτελεσμάτων των μοντέλων βροχής-απορροής MIKE-SHE και ENNS (Nachtnebel et al., 1993). Η ρύθμιση του μοντέλου ENNS πραγματοποιήθηκε στα πλαίσια της εργασίας των Kaleris and Langousis (2012). Ειδικότερα, στο πρώτο κεφάλαιο της εργασίας καθορίζεται η περιοχή μελέτης, τα χαρακτηριστικά της και τα δεδομένα εισαγωγής στο υδρολογικό μοντέλο MIKE SHE. Τα μορφολογικά χαρακτηριστικά αποτελούν η γεωμετρία, η γεωλογία και οι χρήσεις γης της λεκάνης απορροής. Επιπλέον παρουσιάζονται τα διαθέσιμα δεδομένα(βροχόπτωση, θερμοκρασία, μετρημένη απορροή) και η αξιολόγησή τους Στο δεύτερο κεφάλαιο περιγράφεται η αδρομερής μορφή του μοντέλου MIKE-SHE, η οποία χρησιμοποιήθηκε για την προσομοίωση. Για τις επιμέρους διαδικασίες επιλέχτηκαν οι εξής τρόποι υπολογισμού: η επιφανειακή ροή υπολογίζεται με την εξίσωση του Manning, η ροή στην ακόρεστη ζώνη με την μέθοδο του υδατικού ισοζυγίου (απλοποιημένη ροή μέσω μακροπόρων και μοντέλο κατείσδυσης Green and Ampt) και η υπεδάφια απορροή με τη μέθοδο του γραμμικού ταμιευτήρα. Στο τρίτο κεφάλαιο περιγράφεται η διαδικασία βαθμονόμησης των παραμέτρων του μοντέλου MIKE-SHE και παρουσιάζονται οι αναλύσεις ευαισθησίας των σημαντικότερων παραμέτρων του μοντέλου. Η ανάλυση ευαισθησίας για τον προσδιορισμό των τιμών των παραμέτρων του μοντέλου MIKE-SHE πραγματοποιήθηκε για την περίοδο 1984-1989, καθώς ο λόγος ΕΤ/Ρ δεν παρουσιάζει μεγάλες διακυμάνσεις για τις χρονιές αυτές. Οι βέλτιστες τιμές των παραμέτρων για την ρύθμιση του μοντέλου MIKE-SHE, οι οποίες προέκυψαν για την ανωτέρω χρονική περίοδο, εφαρμόστηκαν για την προσομοίωση της απορροής και τις υπόλοιπες χρονιές. Στο τέταρτο κεφάλαιο παρουσιάζονται τα αποτελέσματα του μοντέλου MIKE-SHE σε σύγκριση με εκείνα του μοντέλου βροχής-απορροής ENNS. Αρχικά, συγκρίνεται η συνολική απορροή των δυο μοντέλων μεταξύ τους και με την μετρημένη και εν συνεχεία, συγκρίνονται οι επιμέρους υδρολογικές συνιστώσες του υδρολογικού ισοζυγίου των δυο μοντέλων. Στο τελευταίο κεφάλαιο, παρουσιάζονται συνοπτικά τα συμπεράσματα, τα οποία εξήχθησαν από την σύγκριση των δυο μοντέλων αλλά και από την γενική συμπεριφορά του μοντέλου MIKE-SHE. / The subject of my thesis is the application of the rainfall-runoff model MIKE-SHE in the mountainous part of Glafkos’s basin. The aim of this study is to calibrate the model and to compare the simulations of MIKE-SHE with corresponding simulations of ENNS (Nachtnebel et al., 1993). The simulations with ENNS have been presented by Kaleris and Langousis (2012). Specifically, in the first chapter the study area and its characteristics (morphology, geometry, geology), the available data for the runoff simulations (rainfall, temperature, measured runoff) and their evaluation are presented. In the second chapter is described the structure of the model MIKE-SHE. For the simulation of the individual processes the following concepts are used in MIKE-SHE: the surface flow is calculated using the equation of Manning and for the flow in the unsaturated zone the two-layer water balance method (simplified flow through macropores and infiltration model Green and Ampt) has been used. Finally, for the subsurface runoff the linear reservoir’s equations has been used. In the third chapter the parameters varied in the calibration of MIKE-SHE and the sensitivity of the runoff with respect to these parameters have been presented. By means of the sensitivity analysis the most important parameters, which have been varied for the model calibration have been selected. The fourth chapter presents the results of the MIKE-SHE calibration and their comparison with the results of the rainfall-runoff model ENNS. Particularly, this chapter contains the comparison of the simulated hydrographs of the total runoff with the corresponding measured hydrographs and the hydrographs resulting from ENNS, as well as the comparison of the other water budget components resulting from the two models. The last chapter summarizes the conclusions which are drawn from the comparison of the two models and the evaluation of the behavior of the model MIKE-SHE.

För att avleda vattenmassor som bildas från nederbörd har dagvattensystem konstruerats i vårt samhälle. Dessa system är byggda efter rådande förhållandena vilket betyder att ledningarna kan bli underdimensionerade om regneventen blir större i framtiden vilket de uppskattas göra på grund av klimatförändringar. Problem kan även uppstå då ledningsnätet byggs ut och ledningar i slutet av ledningsnätet utsätts för större flöden än ledningen är dimensionerad efter. Kommuner har ofta dålig vetskap om förhållandena som råder i ledningsnätet vilket betyder att verktyg behövs för att undersöka ledningsnätet. Dessa verktyg kan vara modeller som SWMM eller Mike Urban som kan modellera flödet i dagvattennät. I programmen SWMM och Mike Urban kan brunnar, ledningar, avrinningsområden och regn konstrueras. Som grund till programmen används kartor över ledningsnätet samt flödesmätningar och regnmätningar som används för att validera modellerna. Det som skiljer modellerna är beräkningssätten vilket betyder att modellerna kan få olika resultat för samma område. Syftet med projektet är att använda SWMM och Mike Urban för att undersöka och kilmatanpassa dagvattennätet i Kärrgruvan som är lokaliserat i norra Norberg. Detta område har några kända problem som kan användas för att validera modellerna. Modellernas fördelar och nackdelar, förmåga att klimatanpassas samt användning för konsulter ska utredas. Examensarbete gjordes i samarbete med ÅF, Atkins och Norra Västmalands kommunalteknikförbund. Projektet visade att programmet Mike Urbans resultat var mer jämna och logiska än SWMMs där resultaten kunde fluktuera oerhört när systemet utsattes för förändringar. Kalibreringen som utfördes i detta projekt skulle kunna förbättras vilket antagligen är en bidragande effekt till att resultaten i SWMM blev sämre än Mike Urbans resultat. Hade kalibreringen förbättrats hade antagligen Horton’s infiltrationsmodell som SWMM bygger på kunna ha anpassats bättre efter området och gett mer realistiska resultat. Båda modellerna återspeglade de rådande förhållandena väl, men SWMM hanterade implementeringen av förändring sämre än Mike Urban. Detta är på grund av att infiltrationen i Mike Urban var konstant medan SWMM byggde på Hortons infiltrationsmodell som försämrar infiltrationen allt eftersom. Hade kalibreringen varit bättre hade antagligen resultaten blivit mer lika i SWMM och Mike Urban.

The Florida Everglades has a long history of anthropogenic changes which have impacted the quantity and quality of water entering the system. Since the construction of Tamiami Trail in the 1920's, overland flow to the Florida Everglades has decreased significantly, impacting ecosystems from the wetlands to the estuary. The MIKE Marsh Model of Everglades National Park (M3ENP) is a numerical model, which simulates Everglades National Park (ENP) hydrology using MIKE SHE/MIKE 11software. This model has been developed to determine the parameters that effect Everglades hydrology and understand the impact of specific flow changes on the hydrology of the system. As part of the effort to return flows to the historical levels, several changes to the existing water management infrastructure have been implemented or are in the design phase. Bridge construction scenarios were programed into the M3ENP model to review the effect of these structural changes and evaluate the potential impacts on water levels and hydroperiods in the receiving Northeast Shark Slough ecosystem. These scenarios have shown critical water level increases in an area which has been in decline due to low water levels. Results from this work may help guide future decisions for restoration designs. Excess phosphorus entering Everglades National Park in South Florida may promote the growth of more phosphorus-opportunistic species and alter the food chain from the bottom up. Two phosphorus transport methods were developed into the M3ENP hydrodynamic model to determine the factors affecting phosphorus transport and the impact of bridge construction on water quality. Results showed that while phosphorus concentrations in surface waters decreased overall, some areas within ENP interior may experience an increase in phosphorus loading which the addition of bridges to Tamiami Trail. Finally, phosphorus data and modeled water level data was used to evaluate the spectral response of Everglades vegetation to increasing phosphorus availability using Landsat imagery.