Relevant bibliographies by topics / Dams Models

Academic literature on the topic 'Dams Models'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Dams Models"

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Hussein, Mohammed Noori, Ahmed Alkadhimi, Wisam Abdullah Najim, and Hashim A. Almousawi. "Shaking Table Experiment on Seismic Performance of a Scaled-Down Arch Dam with Initial Crack." International Journal of Design & Nature and Ecodynamics 16, no. 6 (December 21, 2021): 683–89. http://dx.doi.org/10.18280/ijdne.160610.

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Seismic responses of cracked scaled-down arch dams were investigated by experiment on a shaking table. Two different curvature models (M1 and M2) were cast by using a plan concrete. Dams properties, including materials and dimensions, were carefully simulated. A significant earthquake magnitude with (7.7M) and water pressure were applied on the dam's models. Considering water and seismic loadings, the dynamic reactions of the arch dam's system were investigated. Both models showed crack overstresses or propagation on the dam's model as a result of seismic excitations. The arch dam with a higher degree of curvature was recorded 44 Mpa of stress evaluation which less by 30.7% of the arch dam with the lowest degree of curvature. The results indicated that raising the degree of curvature led to raising the dam's stability, earthquake resistance, less displacement, and less growth of tensile cracks.
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Elmazoghi, Hasan G., Vail Karakale (Waiel Mowrtage), and Lubna S. Bentaher. "Comparison of neural networks and neuro-fuzzy computing techniques for prediction of peak breach outflow." Journal of Hydroinformatics 18, no. 4 (January 29, 2016): 724–40. http://dx.doi.org/10.2166/hydro.2016.078.

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Accurate prediction of peak outflows from breached embankment dams is a key parameter in dam risk assessment. In this study, efficient models were developed to predict peak breach outflows utilizing artificial neural network (ANN) and adaptive neuro-fuzzy inference system (ANFIS). Historical data from 93 embankment dam failures were used to train and evaluate the applicability of these models. Two scenarios were applied with each model by either considering the whole data set without classification or classifying the set into small dams (48 dams) and large dams (45 dams). In this way, nine models were developed and their results were compared to each other and to the results of the best available regression equations and recent gene expression programming. Among the different models, the ANFIS model of the first scenario exhibited better performance based on its higher efficiency (E = 0.98), higher coefficient of determination (R2 = 0.98) and lower mean absolute error (MAE = 840.9). Moreover, models based on classified data enhanced the prediction of peak outflows particularly for small dams. Finally, this study indicated the potential of the developed ANFIS and ANN models to be used as predictive tools of peak outflow rates of embankment dams.
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Pisaniello, John D., Wu Zhifang, and Jennifer M. McKay. "Small dams safety issues – engineering/policy models and community responses from Australia." Water Policy 8, no. 1 (February 1, 2006): 81–95. http://dx.doi.org/10.2166/wp.2006.0006.

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Dam safety is a serious issue worldwide. However, in many countries, for example, China and Australia, although much attention is being devoted to the medium to large-scale dams, little or no attention is being paid to the serious potential problems associated with smaller dams, particularly the potential “cumulative domino effect” failure risk to the larger public dams. Farmers in Australia have often overlooked the common law obligation to review/design dams in line with current standards because of high engineering consulting costs. This leaves them vulnerable to litigation if their dam fails and the downstream community is susceptible to unacceptable risk levels. To overcome this problem, an innovative Australian-developed cost-effective spillway design/review procedure has been developed to minimise cost burdens to dam owners and encourage better dam safety management. A recent survey undertaken in the Australian “policy model” State of Victoria to test community attitudes to the procedure and implemented dam safety and water allocation policy is also reported here. This survey clearly demonstrates that farmers require more than awareness and encouragement in order to ensure that they look after their dams properly.
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Bhattacharjee, Sudip S., and Pierre Léger. "Concrete constitutive models for nonlinear seismic analysis of gravity dams — state-of-the-art." Canadian Journal of Civil Engineering 19, no. 3 (June 1, 1992): 492–509. http://dx.doi.org/10.1139/l92-059.

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The seismic safety of concrete dams is a matter of serious concern around the world. During severe ground motions, the dams are likely to experience cracking due to low tensile resistance of concrete. Several analytical methods have been proposed in the literature for finite element crack propagation analysis of concrete structures. Due to lack of consistent results, and virtually impossible verification because of limited field experience in seismic cracking of concrete dams, the choice of a reliable constitutive model has become a complex task. A review of concrete constitutive models for nonlinear seismic analysis of gravity dams is presented herein. The relative merits of the proposed models have been critically examined. Comparing the theoretical soundness, and the advantages and inconveniences of the different analytical procedures, the nonlinear fracture mechanics model applied with a smeared crack analysis technique appears to be very promising. The present state of knowledge on material fracture parameters under transient conditions has been found to be limited. Review of the past finite element seismic fracture analyses of concrete gravity dams reveals that reliable numerical models for safety evaluation of the structures during severe ground motions have not yet been satisfactorily developed. Key words: gravity dams, constitutive models, fracture mechanics, seismic response, nonlinear analysis, finite element, crack propagation.
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Lyapichev, Yury P. "Choice of mathematic models of soils in static and seismic analyses of embankment dams." Structural Mechanics of Engineering Constructions and Buildings 16, no. 4 (December 15, 2020): 261–70. http://dx.doi.org/10.22363/1815-5235-2020-16-4-261-270.

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Relevance. Numerical analyses of behavior or stress-strain state (SSS) of embankment dams are usually performed using various computational programs, which use different, often complex mathematical models of soils. However, the right choice of these models is left to the program user, who usually has not enough experience in this field of knowledge, and therefore the results of these analyses are often obscure and erroneous. The aims of the work - development of recommendations for selecting the most reliable mathematical models of soils in numerical analyses of embankment dams and comparing these models with the most common models in modern world practice of their application. Methods. Deep comparative analysis of many soil models was conducted on the use of the soil models in numerical analyses of embankment dams during authors work in ICOLD Committee on Analysis and Dam Design. Results. On the basis of the evaluation of the reliability of soil models, recommendations were obtained on the choice and application of these models in the numerical analyses of SSS of embankment dams under action of static and seismic impacts; interactions between the results of these analyses and dam monitoring data were identified.
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Sultanov, Tokhirjon, Bakhtiyor Yuldoshev, Elyor Toshmatov, Javlonbek Yarashov, Rustam Ergashev, and Mirziyod Mirsaidov. "Strength assessment of earth dams." MATEC Web of Conferences 265 (2019): 04015. http://dx.doi.org/10.1051/matecconf/201926504015.

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A comparative method for estimating the stress-strain state of earth dams under the effect of static load is given in the paper using spatial and plane-strain models. The results of assessment of stress-strain state of several earth dams using these methods are given. Analysis of the results obtained allows us to conclude that a plane calculation model gives results almost identical to the ones obtained with spatial model; in future that can be the basis for developing recommendations on the use of certain calculation models. Some features of stress state in a spatial case are revealed, indicating the occurrence of dangerous areas with the greatest stresses.
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Qiu, Jianchun, Dongjian Zheng, and Kai Zhu. "Seepage Monitoring Models Study of Earth-Rock Dams Influenced by Rainstorms." Mathematical Problems in Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/1656738.

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For earth-rock dams influenced by rainstorms, seepage status monitoring is very important and provides the basis for the safe and effective operation of earth-rock dams. The most influential factors concerning the seepage of earth-rock dams are the reservoir water level, precipitation, temperature, and timeliness, and the influence of the reservoir water level and precipitation on the seepage of an earth-rock dam exhibits hysteretic effects. The reservoir water level of an earth-rock dam abruptly increases and may exceed the historically highest water level, therein causing new deformations of the earth-rock dam or even plastic deformation. Thus, the permeability coefficient for parts of an earth-rock dam changes, and we present the exceeded water level factor. Considering the complexity of the seepage monitoring of earth-rock dams, based on the hysteretic reservoir water level and precipitation, temperature, timeliness, and the exceeded water level factor, a statistical model based on an explicit function and an artificial wavelet neural network model based on an implicit function are established. Based on these two models, an integrated monitoring model based on maximum entropy theory is established. At the end of this paper, three monitoring models are used for the seepage monitoring of a measuring point of an earth-rock dam influenced by rainstorms, and the results show that the three monitoring models obtain satisfactory predication accuracy.
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Menichini, Daniela, Mesk Alrais, Chen Liu, Yang Xia, Sean C. Blackwell, Fabio Facchinetti, Baha M. Sibai, and Monica Longo. "Maternal Supplementation of Inositols, Fucoxanthin, and Hydroxytyrosol in Pregnant Murine Models of Hypertension." American Journal of Hypertension 33, no. 7 (March 17, 2020): 652–59. http://dx.doi.org/10.1093/ajh/hpaa041.

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Abstract Background Myoinositol (M) and D-chiro-inositol (D) are insulin sensitizer compounds, while fucoxanthin (F) and hydroxytyrosol (H) are antioxidant substances. We aim to investigate if the combination of these compounds, will improve the vascular responses in pregnant mouse models of hypertension: a genetic model, transgenic heterozygous mice lacking endothelial nitric oxide synthase gene (eNOS−/+); and environmental, wild-type (WT) mice. Those mouse models will allow a better understanding of the genetic/environmental contribution to hypertension in pregnancy. Methods eNOS−/+ and WT female were fed high fat diet for 4 weeks, then at 7–8 weeks of age were mated with WT male. On gestational day (GD) 1, they were randomly allocated to receive MDFH treatment or water as control: eNOS−/+ MDFH (n = 13), eNOS−/+ (n = 13), WT-MDFH (n = 14), and WT (n = 20). Systolic blood pressure (SBP) was obtained at GD 18, then dams were sacrificed; fetuses and placentas collected, and 2 mm segments of carotid arteries isolated for vascular responses using the wire-myograph system. Responses to phenylephrine (PE), with/without the NOS inhibitor (N-nitro-l-arginine methyl ester (l-NAME)), and to acetylcholine (Ach) and sodium nitroprussiate (SNP) were performed. Results SBP decreased in eNOS−/+ and WT dams after MDFH supplementation. In eNOS−/+, MDFH lower the contractile response to PE and l-NAME and improved Ach vasorelaxation. In WT dams, MDFH treatment did not affect PE response; MDFH treatment lowered the vascular PE response after incubation with l-NAME. No differences were seen in SNP relaxation in both models. Conclusions MDFH decreased SBP in both genetically and environmentally hypertensive dams and improved vascular responses mostly in the eNOS−/+ dams.
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Hu, Shao Qing, and Bai Tao Sun. "Dynamic Responses of Arch Dams Considering Different Reservoir Models." Advanced Materials Research 250-253 (May 2011): 3923–26. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.3923.

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In this paper, the dynamic responses of an arch dam in the case of normal water level and operating low water level were simulated by using additional mass model and incompressible finite element model for reservoir respectively. The results showed that the reservoir models have a great impact on dynamic response of arch dams. The maximum principle tensile stress using incompressible finite element model of fluid is less than that using additional mass model. With the depth of the reservoir water increasing, the hydrodynamic pressure acting ton the dam surface caused by earthquake force increased and the dynamic responses of dam also increased.
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Van Vleck, L. D. "Alternative animal models with maternal effects and foster dams." Journal of Animal Science 68, no. 12 (December 1, 1990): 4026–38. http://dx.doi.org/10.2527/1990.68124026x.

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Dissertations / Theses on the topic "Dams Models"

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Nilsson, Isak, and Leonard Sandström. "Behavior prediction of concrete dams." Thesis, KTH, Betongbyggnad, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289385.

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As many dams were built around 1950, the expected life span of these dams are about tobe reached. With this, the need for monitoring and increased understanding of the damsstructural integrity increases. In order to prevent failures, two warning signals are defined;alert and alarm. The main difference being that the first indicates an unexpected changein behavior that needs to be addressed and evaluated in the near future, while the otherrequires that immediate action must be taken to ensure the safety of the dam.This report aims to evaluate the applicability of different models for designing alert values.In order to achieve this goal, two case studies have been performed. The first being onSchlegeis, an arch dam in Austria, and the second Storfinnforsen, a concrete buttress damin Sweden. The methods used are finite element modelling as well as data-based models.Data-based models work on the presumption that the dam behaviour is governed by variationsin environmental conditions such as temperature and water level. The report hasevaluated two commonly used data-based models, hydrostatic thermal time (HTT) and hydrostaticseasonal time (HST), as well as two machine learning based models artificial neuralnetworks (ANN) and boosted regression trees (BRT).The programs used in this report are BRIGADE plus for finite element method and MATLABfor the multi-linear regression analyses HTT and HST, as well as boosted regressiontrees. The neural networks were constructed in Python using TensorFlow and Keras API.The result from the case studies is that the commonly used data-based models HST andHTT perform well enough for creating predictions and alert levels when given a sufficientamount of historical data, approximately 3-5 years. Machine learning such as artificial neuralnetworks while comparable in prediction quality does not further increase the understandingof the dam behaviour and can due to the complexity of designing an appropriate networkstructure be less suited for this type of analysis. Finite element models can also capturethe behavior of the dam rather well. It is however not as accurate as data-based modelswhen sufficient data is available. An FE-model should be used for definition of alert valueswhen insufficient data exists after the dam conditions have been significantly altered, orwhen newly constructed. The main advantage that machine learning provides is that theyperform better for non-linear behavior than multi-linear regression.
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BASEGHI, BEHDAD. "THREE-DIMENSIONAL SEEPAGE THROUGH POROUS MEDIA WITH THE RESIDUAL FLOW PROCEDURE." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184107.

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The purpose of this study is to present the development and application of residual flow procedure for analysis of three-dimensional (3-D) steady-state and transient seepage. The finite element equations are derived using a pseudo-variational principle which leads to a transient residual flow (load) vector that, in turn, is used to correct the position of the free surface iteratively. The procedure involves a fixed mesh which requires no mesh regeneration during transient analysis and during iterations. The procedure is also capable of handling material nonhomogeneities and anisotropy with relative ease. Several applications are made including verification with respect to closed-form solutions, and with results from a laboratory glass bead model simulating three-dimensional situations. For these glass beads, the coefficients of permeability and specific storage are also evaluated experimentally.
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Hellgren, Rikard. "Condition assessment of concrete dams in cold climate." Licentiate thesis, KTH, Betongbyggnad, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259719.

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Dams in many countries are approaching their expected service life. Proper assessment of the aging dams structural health increase the knowledge of the current safety, and allow for better planning of renovation and rebuilding investments. The behavior of concrete dams is, to a great extent, governed by the ambient variation in temperature and water level. In cold regions, the ice sheet formed in the reservoir may subject a pressure load on the dams. Theoretically, this load has a significant impact on the structural behavior of dams. Despite this, the maximum magnitude, as well as the seasonal variation of the ice load, constitute the most considerable uncertainty in the safety assessment of dams. This thesis presents research that examines how to model the expected behavior of dams in cold climate. The underlying problem is to predict the response of dams due to variation in the external conditions. Since the ice load is such a vital part of the external conditions in cold climate, the understanding and modeling of ice loads have been given extra attention. Models suitable to predict the long-term behavior of dams can be divided between theoretical, data-based, and hybrid. Prediction accuracy is essential to set alert thresholds, and in that regard, the data-based models are generally superior. The major contribution of this thesis is the design and installation of a prototype ice load panel with direct measurement of the ice pressure acting on a dam. The panel is attached on the upstream face of the dam and is large enough so that the whole thickness of the ice sheet is in contact with the panel. The predicted ice load from the best available model that includes loads from both thermal events and water level changes did not correspond to the measured ice loads. As there are no validated models or measurement methods for ice load on the dam, continued research is necessary, both through further measurements to increase knowledge and development of models.
I många länder närmar sig vattenkraftsdammarna deras förväntade tekniska livslängd. Korrekt utvärdering av dammens strukturella status ökar kunskapen om det nuvarande säkerhetsläget och möjliggör för bättre planering av renoveringar och ombyggnadsinvesteringar. Betongdammarnas beteende styrs till stor del av variationen i omgivande temperaturer och vattennivå. I kalla regioner kan is som bildas i magasinet utsätta dammen för en tryckande last. Teoretiskt har denna belastning en betydande inverkan på dammarsstrukturella beteende. Trots detta är den maximala storleken såväl som säsongsvariationen för islasten en av de mest betydande osäkerheterna vidsäkerhetsbedömningen av dammar. Denna uppsats presenterar forskning som undersöker hur förväntat beteendehos dammar i kallt klimat kan modelleras. Den underliggande frågeställningen är att förutsäga en damms respons orsakad av variation i de yttre förhållandena. Extra fokus har lagts på förståelsen och modelleringen av islasten då den är en viktig del av de yttre förhållandena för dammar i kalla klimat. Modeller som är lämpliga för att förutsäga dammars beteende kan delas upp i teoretiska, databaserad, och hybridmodeller. Förutsägbarhetsnoggrannhet är avgörande för att ställa in varningsnivåer, och i det avseendet är de databaserade modellerna i allmänhet överlägsna. Det huvudsakliga bidraget från detta projekt är utvecklandet och installationen av en prototyp av en islast panel, fäst på en damms uppströmssida. Panelen mäter istrycket direkt mot dammen och är tillräckligt stor så att helaisens tjocklek förblir i kontakt med panelen. Panelen bidrar till ökad kunskap om säsongsvariationen i istryck och mekanismen för islaster orsakad av variation i vattennivån. Den predikterade islaten från den bästa tillgängliga islastmodellen som inkluderar termiska islaster och islaster från vattennivåförändringar överensstämmer inte med de uppmätta islastpanelen som uppmätts med panelen. Då det saknas validerade modeller eller mätmetoder för islast är det viktigt med fortsatt forskning, dels genom ytterligare mätningar för att öka kunskapen men även fortsatt modellutveckling.

QC 20190926

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Boughoufalah, Mohamed. "Earthquake input mechanisms for dam-foundation interaction." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63932.

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Tzenkov, Anton D. "Seismic analysis of concrete arch dams with contraction joint and nonlinear material models." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ61026.pdf.

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Al-Areeki, Mohamed Abdulwadood Saif. "An experimental study on models of overtopping rockfill dams with rock armour protection." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246663.

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Husain, Sarhang Mustafa. "Computational investigation of skimming flow on stepped spillways using the smoothed particle hydrodynamics method." Thesis, Swansea University, 2013. https://cronfa.swan.ac.uk/Record/cronfa43038.

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Wong, Evelyn. "“Damning The Dams”: A Study of Cost Benefit Analysis In Large Dams Through The Lens of India's Sardar Sarovar Project." Scholarship @ Claremont, 2013. http://scholarship.claremont.edu/scripps_theses/169.

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This thesis examines the evaluation of the economic, environmental and social effects of dams, and lessons learned from previous dams. It then focuses on cost benefit analysis as a decision-making tool pre-project for evaluating the potential gains and losses of building a dam; and as a framework for evaluating dams in operation. It reviews the basic assumptions required for a legitimate cost benefit analysis, and the inherent limitations of this method. It uses the Sardar Sarovar dam as a case study for the use and abuse of cost benefit analysis in decision-making, interstate politics, propaganda and activism. It also illustrates the difficulties in dividing costs and benefits in an equitable manner at national, state, and grassroots levels.
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Griscom, Hannah. "The drying of the Luvuvhu River, South Africa distinguishing the roles of dams and land cover change /." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1313913321&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Mueller, Zachery P. "Feasibility Study of Removing the Grand Rapids-Providence Dams, Maumee River (NW Ohio) Based on HEC-RAS Models." Bowling Green State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1219849492.

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Books on the topic "Dams Models"

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CADAM, Meeting (1998 Wallingford England). Proceedings of the CADAM meeting, Wallingford, United Kingdom: Concerted action on dam-break modelling, 2 and 3 March 1998. Brussels: European Commission, Directorate-General Research, 1999.

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Dodge, R. A. Overtopping flow on low embankment dams: Summary report of model tests. Denver, Colo: Hydraulics Branch, Research and Laboratory Services Division, Denver Office, U.S. Dept. of the Interior, Bureau of Reclamation, 1988.

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Hanna, Leslie J. Hydraulic model study of the Spring Creek Debris Dam selective withdrawal system. Denver, Colo: Water Resources Research Laboratory, Water Resources Services, Technical Service Center, U.S. Bureau of Reclamation, 1995.

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Dam breach modeling technology. Dordrecht: Kluwer Academic Publishers, 1996.

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USSD Committee on Earthquakes. Numerical models for seismic evaluation of concrete dams: Review, evaluation and interpretation of results. Denver, CO: U.S. Society on Dams, 2008.

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Benchmark, Workshop on Numerical Analysis of Dams (5th 1999 Denver Colo ). Proceedings: Fifth Benchmark Workshop on Numerical Analysis of Dams. Denver, Colo: U.S. Committee on Large Dams, 2000.

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Klumpp, Cassie C. Hydraulic model study of Twin Buttes Dam fuse plug spillway. Denver, Colo: Hydraulic Branch, Division of Research and Laboratory Services, Engineering and Research Center, U.S. Dept. of the Interior, Bureau of Reclamation, 1988.

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Johnson, Perry L. Hydraulic model study of the spillway for Ridgway Dam, Colorado. Denver, Colo: Hydraulics Branch, Division of Research and Laboratory Services, Engineering and Research Center, U.S. Dept. of the Interior, Bureau of Reclamation, 1986.

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Frizell, Kathleen Houston. Hydraulic model study of right auxiliary spillway at Stewart Mountain Dam. Denver, Colo: Hydraulics Branch, Division of Research and Laboratory Services, Engineering and Research Center, U.S. Dept. of the Interior, Bureau of Reclamation, 1986.

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Vermeyen, Tracy. Laboratory and field evaluations of acoustic velocity meters at Davis and Parker Dams. Denver, Colo: Water Resources Research Laboratory, Water Resources Group, Technical Service Center, U.S. Bureau of Reclamation, 1995.

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Book chapters on the topic "Dams Models"

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Fanelli, M. "Models and Methods of Analysis." In Arch Dams, 79–288. Vienna: Springer Vienna, 1999. http://dx.doi.org/10.1007/978-3-7091-2488-8_2.

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Brill, Percy H. "Dams and Inventories." In Level Crossing Methods in Stochastic Models, 1–49. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09421-2_6.

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Brill, Percy H. "Dams and Inventories." In Level Crossing Methods in Stochastic Models, 337–87. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50332-5_6.

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Hungr, O. "Prospects for Prediction of Landslide Dam Geometry Using Empirical and Dynamic Models." In Natural and Artificial Rockslide Dams, 463–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04764-0_18.

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Bianchi-Fasani, G., C. Esposito, M. Petitta, G. Scarascia-Mugnozza, M. Barbieri, E. Cardarelli, M. Cercato, and G. Di Filippo. "The Importance of Geological Models in Understanding and Predicting the Life Span of Rockslide Dams: The Case of Scanno Lake, Central Italy." In Natural and Artificial Rockslide Dams, 323–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04764-0_11.

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Abdel-Hameed, Mohamed. "Storage Models: Control of Dams Using P $$_{\lambda ,\tau }^{M}$$ Policies." In Lévy Processes and Their Applications in Reliability and Storage, 77–108. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40075-9_3.

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Fontanella, E., L. Pagano, and A. Desideri. "Simplified Models for the Interpretation of Total Stress Measurement of Embankment Dams." In Dam Breach Modelling and Risk Disposal, 340–44. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-46351-9_35.

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Siderius, Christian, Robel Geressu, Martin C. Todd, Seshagiri Rao Kolusu, Julien J. Harou, Japhet J. Kashaigili, and Declan Conway. "High Stakes Decisions Under Uncertainty: Dams, Development and Climate Change in the Rufiji River Basin." In Climate Risk in Africa, 93–113. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61160-6_6.

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AbstractThe need to stress test designs and decisions about major infrastructure under climate change conditions is increasingly being recognised. This chapter explores new ways to understand and—if possible—reduce the uncertainty in climate information to enable its use in assessing decisions that have consequences across the water, energy, food and environment sectors. It outlines an approach, applied in the Rufiji River Basin in Tanzania, that addresses uncertainty in climate model projections by weighting them according to different skill metrics; how well the models simulate important climate features. The impact of different weighting approaches on two river basin performance indicators (hydropower generation and environmental flows) is assessed, providing an indication of the reliability of infrastructure investments, including a major proposed dam under different climate model projections. The chapter ends with a reflection on the operational context for applying such approaches and some of the steps taken to address challenges and to engage stakeholders.
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Regina, Gianluca, Paolo Zimmaro, Katerina Ziotopoulou, and Roberto Cairo. "Seismic Fragility Analysis of Two Earth Dams in Southern Italy Using Simplified and Advanced Constitutive Models." In Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022), 1968–75. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11898-2_180.

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Kasprowicz, Dawid. "Achtung! Hunde auf der Fahrbahn." In Autonome Autos, 187–210. Bielefeld, Germany: transcript Verlag, 2021. http://dx.doi.org/10.14361/9783839450246-006.

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Dawid Kasprowicz widmet sich in diesem Artikel wissenschafts- und medienhistorisch dem Model des Reinforcement Learning (RL), das bei der Modellierung autonomer Autos einen zentralen Stellenwert hat. Dabei wird dargelegt, dass die Verbreitung und Anwendung des bestärkenden Lernens nicht nur eine Folge des verbesserten Lernverhaltens durch das Trainieren Neuronaler Netzwerke in Spielsituationen darstellt. Es wird argumentiert, dass das RL eine deartige Relevanz für das Testen autonomer Autos hat, weil es die Steuerung von Kontingenz in Experimenten und Simulationen ermöglicht. Es ist diese Steuerung von Kontingenz, die für die Simulationen autonomer Autos unabdingbar wird. Sie eröffnet zugleich die Frage, was der Übergang aus Verhaltensexperimenten in Verkehrssimulationen über das RL-Modell und die Modellierung autonomer Autos aussagt.
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Conference papers on the topic "Dams Models"

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Geppetti, Andrea, Johann Facciorusso, and Claudia Madiai. "Tailings Dams Numerical Models: A Review." In The 7th World Congress on Civil, Structural, and Environmental Engineering. Avestia Publishing, 2022. http://dx.doi.org/10.11159/icgre22.241.

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Chiella, Antonio C. B., Carlos H. F. dos Santos, Lucas R. H. Motta, Jeremy G. Rauber, and Deisson Cassiano Diedrich. "Control strategies applied to autonomous underwater vehicle for inspection of dams." In 2012 17th International Conference on Methods & Models in Automation & Robotics (MMAR). IEEE, 2012. http://dx.doi.org/10.1109/mmar.2012.6347898.

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Sevieri, Giacomo, and Anna De Falco. "CONCRETE GRAVITY DAMS FE MODELS PARAMETERS UPDATING USING AMBIENT VIBRATIONS." In 2nd International Conference on Uncertainty Quantification in Computational Sciences and Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2019. http://dx.doi.org/10.7712/120219.6341.18557.

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Zhiguo, Niu, You Ri, Hu Shaowei, and Lu Jun. "Seismic Response Analysis of Concrete Dams Using Damage Mechanics and Creep Models." In 12th Biennial International Conference on Engineering, Construction, and Operations in Challenging Environments; and Fourth NASA/ARO/ASCE Workshop on Granular Materials in Lunar and Martian Exploration. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41096(366)70.

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COLOMBO, MARTINA, MARCO DOMANESCHI, and ALDO GHISI. "Validation of Finite Element Models of Existing Concrete Dams, Through Monitoring Data." In Structural Health Monitoring 2015. Destech Publications, 2015. http://dx.doi.org/10.12783/shm2015/61.

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Fry, J. "Lessons on internal erosion in embankment dams from failures and physical models." In The 8th International Conference on Scour and Erosion. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315375045-6.

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Chandrasena, Amila, Kesara Weerasekara, and Nihal Somaratna. "Structural Behavior of Two Major Concrete Dams in Sri Lanka Under Earthquake Loads." In The SLIIT International Conference on Engineering and Technology 2022. Faculty of Engineering, SLIIT, 2022. http://dx.doi.org/10.54389/uljj1902.

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Dams are built for a variety of purposes including hydropower generation, irrigation, water supply, and flood mitigation. Concrete and earth dams are common types of dams in Sri Lanka. Concrete dams can be categorized as Gravity dams and Arch dams. Gravity dams are most common in Sri Lanka. Dams can also pose safety hazards. Failure of a dam can cause serious damages to both people and property downstream. One of the major threats to dams is earthquakes. They can have significant impacts on the stresses within the dams. In extreme cases this can cause even failures of dams. These possibilities can be investigated using finite element analysis. In this study Rantambe and Moragahakanda concrete gravity dams were selected for 2-D finite element analysis under the action of suitable earthquakes. For each case linear time history analysis was performed using SAP2000 software. The stresses were examined for potential failures. Important considerations in this process were selection of dams, selection of suitable earthquake records, and identification of an appropriate failure criterion. The selection of earthquake records was based on proximity and geological conditions. Koyna earthquake was used to develop suitable earthquake loadings. Peak ground acceleration was varied from 0.05g to 0.15g. Westergaard method was used to assign hydrodynamic loads. Coulomb-Mohr criterion was employed to investigate potential failures in concrete. Stresses in dam models during the earthquakes was scrutinized for potential failures. Significant stress increases were observed in some areas of the dams. These critical areas and corresponding values of earthquake parameters were identified. It was concluded that the dams were unlikely to suffer material failures under earthquake loads even with a peak ground acceleration of 0.1g (which is the value recommended for use for critical structures in the areas concerned). KEYWORDS: Concrete gravity dams, Finite element model, Coulomb-Mohr criterion, Time history analysis, Westergaard method
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Ulfberg, Adrian, Jaime Gonzalez-Libreros, Oisik Das, Gabriel Sas, Erik Andersson, Dipen Bistaa, Bård Arntsen, and Andreas Seger. "Influence of large-scale asperities on the stability of concrete dams." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.1358.

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<p>For concrete dams founded on rock, there are only a few options in the common analysis methods to account for large‐scale asperities. However, previous research alludes that they have a significant impact on the behaviour of interfaces under shear. This study investigates the behaviour of concrete dam scale models with varying interface geometries, under a realistic set of eccentric loads. The outcome of the scale model tests shows that not only the capacity of the scale models was significantly impacted by the asperities, but also the type of failure in the scale models.</p>
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Zhao, Lanhao, Xueqian Wang, and Tongchun Li. "Effects of Reservoir Models on Dynamic Characteristics and Dynamic Response of High Arch Dams." In Thirteenth ASCE Aerospace Division Conference on Engineering, Science, Construction, and Operations in Challenging Environments, and the 5th NASA/ASCE Workshop On Granular Materials in Space Exploration. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412190.090.

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S. I., Umarkhonov, and Normatov Sh. I. "ON STRESS STATE OF EARTH DAMS UNDER THE ACTION OF THEIR OWN WEIGHT." In Mechanical Science and Technology Update. Omsk State Technical University, 2022. http://dx.doi.org/10.25206/978-5-8149-3453-6-2022-235-244.

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The paper is devoted to static problems of studying the stress state of earth dams, taking into account their own weight. A method of static problems is developed to determine the stress-strain state of earth dams. An algorithm for solving problems and calculation formulas based on the finite difference method were developed. The advantage of the developed method is the implementation of complex strain models considering structural changes in soil media. The problems of the stress state of the earth massif and the earth dam are solved by two methods, using the finite difference method and the Plaxis program based on the finite element method. The distribution of the stress state over the earth massif and over the cross section of the dam under the action of its own weight is determined using the example of the Charvak dam. The results obtained by the finite difference method and by the Plaxis program based on the finite element method are compared.
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Reports on the topic "Dams Models"

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Hernandez-Abram, Darixa D., Susan E. Bailey, and S. Kyle McKay. Environmental Effects of Sediment Release from Dams : Conceptual Model and Literature Review for the Kansas River Basin. U.S. Army Engineer Research and Development Center, July 2022. http://dx.doi.org/10.21079/11681/44880.

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Passing sediment from reservoirs to downstream channels is a potential solution to aging infrastructure and reservoir storage capacity loss, which is a pressing challenge nationwide. The US Army Corps of Engineers (USACE) sediment management actions at reservoirs such as flushing may drive ecological changes that may be beneficial or detrimental to downstream ecosystems. However, these potential effects are currently not well understood or documented. An exploratory study of the potential ecological effects of releasing sediment downstream from reservoirs is presented in this technical note (TN). We focus on Tuttle Creek Reservoir in Kansas and use fish species as indicators of ecological change. A literature review of Kansas fishes was conducted and three conceptual models illustrating potential benefits or negative effects of releasing sediment downstream of Tuttle Creek Reservoir was developed. Some fish species may benefit from sediment releases, while others may be negatively affected. Further research and tools are needed to develop a greater understanding of these effects.
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Alt, Jonathan, Willie Brown, George Gallarno, and John Richards. Risk-based prioritization of operational condition assessments : stakeholder analysis and literature review. Engineer Research and Development Center (U.S.), March 2021. http://dx.doi.org/10.21079/11681/40162.

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The US Army Corps of Engineers (USACE) operates, maintains, and manages more than $232 billion worth of the Nation’s water resource infrastructure. Using the Operational Condition Assessment (OCA) system, the USACE allocates limited resources to assess conditions and maintain assets in efforts to minimize risks associated with asset performance degradation. Currently, OCAs are conducted on each component within a facility every 5 years, regardless of the component’s risk contribution. The analysis of risks associated with Flood Risk Management (FRM) facilities, such as dams, includes considering how the facility contributes to its associated FRM watershed system, understanding the consequences of degradation in the facility’s performance, and calculating the likelihood that the facility will perform as expected given the current OCA condition ratings of critical components. This research will develop a scalable methodology to model the probability of failure of components and systems that contribute to the performance of facilities in their respective FRM systems combined with consequences derived from hydrological models of the watershed to develop facility risk scores. This interim report documents the results of the first phase of this effort, stakeholder analysis and literature review, to identify candidate approaches to determine the probability of failure of a facility.
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Allen, James, Stuart Foltz, and Matthew Werth. Sustainment management system dams inspection module : Department of Defense dams inventory and inspection template. Construction Engineering Research Laboratory (U.S.), June 2018. http://dx.doi.org/10.21079/11681/27351.

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Corum, Zachary, Ethan Cheng, Stanford Gibson, and Travis Dahl. Optimization of reach-scale gravel nourishment on the Green River below Howard Hanson Dam, King County, Washington. Engineer Research and Development Center (U.S.), April 2022. http://dx.doi.org/10.21079/11681/43887.

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The US Army Corps of Engineers, Seattle District, nourishes gravel downstream of Howard Hanson Dam (HHD) on the Green River in Washington State. The study team developed numerical models to support the ongoing salmonid habitat improvement mission downstream of HHD. Recent advancements in computing and numerical modeling software make long-term simulations in steep, gravel, cobble, and boulder river environments cost effective. The team calibrated mobile-bed, sediment-transport models for the pre-dam and post-dam periods. The modeling explored geomorphic responses to flow and sediment regime changes associated with HHD construction and operation. The team found that pre-dam conditions were significantly more dynamic than post-dam conditions and may have had lower spawning habitat quality in the project vicinity. The team applied the Bank Stability and Toe Erosion Model to the site and then calibrated to the post-dam gravel augmentation period. The team implemented a new hiding routine in HEC-RAS that improved the simulated grain size trends but underestimated coarse sediment transport. Models without the hiding function overestimated grain size but matched bed elevations and mass flux very well. Decade-long simulations of four future gravel nourishment conditions showed continued sediment storage in the reach. The storage rate was sensitive to nourishment mass and grain size.
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Garton, Byron. Growing Degree Days Model user’s guide. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33562.

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Adams, J., and S. Halchuk. Implications of Canada's 4th generation seismic hazard model for Canadian dams. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2004. http://dx.doi.org/10.4095/215581.

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Garton, Byron. Heating and Cooling Degree Days Model user’s guide. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33569.

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Garton, Byron. Range Days Lost to Fire Risk Model user’s guide. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33555.

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Garton, Byron. Range Days Lost to Heat Risk Model user’s guide. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33576.

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Tanika, Lisa, Betha Lusiana, and Adis Hendriatna. Simulasi Dampak Perubahan Tutupan Lahan dan Iklim di DAS Citarum Hulu dengan Model GenRiver: Kalibrasi model dan analisa sensitivitas. World Agroforestry, 2020. http://dx.doi.org/10.5716/wp20048.pdf.

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Alih guna lahan dan perubahan iklim merupakan faktor-faktor yang dapat mempengaruhi kondisi hidrologi di suatu Daerah Aliran Sungai (DAS), dan yang dapat mempengaruhi efektifitas fungsi DASdalam mempertahankan keseimbangan neraca air di tingkat bentang alam. Oleh karena itu pengelolaan DAS yang didukung dengan perencanaan DAS terpadu yang juga mengatur peruntukan dan pemafaatan wilayah sangat diperlukan. Langkah awal dalam perencanaan DAS adalah dengan menilai kondisi fungsi hidrologi DAS tersebut dengat tujuan mengetahui apakah DAS mulai atau telah mengalami degradasi, atau sebaliknya mulai mengalami perbaikan fungsi DAS. Model simulasi seperti model Genriver dapat digunakan menilai kondisi saat ini serta memproyeksikan bagaimana dampak perubahan lahan dan iklim terhadap kondisi hidrologis DAS. Salah satu DAS penting di Jawa Barat adalah DAS Citarum Hulu sebagi bagian dari DAS Citarum yang telah ditetapkan sebagai salah satu DAS prioritas nasional. Kalibrasi model dan analisis sensitivitas menjadi bagian penting untuk mengetahui kelayakan suatu model hidrologi dalam mensimulasikan kondisi DAS, khususnya dalam mengestimasi neraca air di tingkat lansekap. Hasil kalibrasi model GenRiver dengan menggunakan data tahun 2012-2016 menunjukkan bahwa parameterisasi model telah berhasil dan model layak digunakan untuk analisa sensitivitas dan simulasi skenario. Hasil simulasi model, menunjukan bahwa secara rata-rata 37% curah hujan yang jatuh di DAS Citarum Hulu menjadi aliran permukaan (surface flow/run-off), 7% menjadi aliran bawah permukaan (sub-surface flow) dan 20% menjadi aliran dasar (baseflow). Analisa senssitivitas dilakukan dengan menyusun lima skenario tutupan lahan dan tiga skenario curah hujan yang dianggap mewakili berbagai kondisi yang mungkin termasuk kondisi ekstrim: yaitu keseluruhan lahan menjadi area terbuka (ekstrim negatif) dan seluruh lahan menjadi hutan (ekstrim positif). Hasil proyeksi simulasi ekstrim negatif menunjukan bahwa kondisi DAS Citarum Hulu yang terdegradasi dengan dominasi lahan terbuka berpotensi meningkatkan aliran permukaan hingga mencapai 70% dari curah hujan. Sedangkan perbaikan tutupan lahan DAS Citarum hulu dengan reforestasi (skenario ekstrim positif) mampu menurunkan aliran permukaan hingga mencapai 20% dari total curah hujan.
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