scholarly journals Ziyaret Gölet Havzası Akımlarında Tarımsal Uygulamalara Bağlı Olarak Cu++, Fe++, Zn++ ve Cl- içeriklerinin Zamansal Değişiminin Araştırılması

2020 ◽  
pp. 248-260
Author(s):  
İsa KAYA ◽  
İrfan OĞUZ ◽  
Rasim KOÇYİĞİT
Keyword(s):  
Mike 11

Tarımsal uygulamalar ve hızlı kentleşme, küçük kırsal havzaların su kalitesine yönelik ciddi tehditlere neden olmaktadır. Bu çalışmada, Ziyaret Göleti havzasında tarımsal uygulamalar ve bu uygulamaların su kalitesi üzerine etkisi araştırılmıştır. Bu amaçla, 2014 su yılı için havza akışlarının bazı kimyasal özellikleri (01 Ekim 2013 - 29 Eylül 2014) incelenmiştir. Havza akışlarının Cu+2, Fe+2, Zn+2 ve Cliçerikleri toplanan su numunelerinin analizi ile tanımlanmıştır. Havza akışları MIKE 11 NAM hidrolojik model yardımıyla tahmin edilmiştir. Analiz sonuçlarına göre, Cu 0.008-0.35 mgl-1, Fe 0.051-0.096 mg l-1, Zn 0.033-0.146 mg l-1, Cl 0.053-0.186 mgl-1 arasında değişmektedir. Havzadan günlük olarak taşınan kimyasalların miktarı havzanın günlük akışları dikkate alınarak hesaplanmıştır. Hesaplanan değerler Cu+ 20-25.41 kg gün-1, Fe+ 20-21.01 kg gün-1, Zn+2 0-22.15 kg gün-1 ve Cl- 0-22.57 kg gün-1. Sulama amacıyla yapılan Amasya Ziyaret Göleti'nin periyodik su kalitesi ile havzadaki tarımsal faaliyetler arasındaki ilişki araştırılmıştır.

Application of the coupled MIKE SHE/MIKE 11 modelling system to a lowland wet grassland in southeast England

2004 ◽  
Vol 293 (1-4) ◽  
pp. 151-179 ◽  
Author(s):  
J.R. Thompson ◽  
H.Refstrup Sørenson ◽  
H. Gavin ◽  
A. Refsgaard
Keyword(s):  
Mike She ◽  
Mike 11 ◽  
Wet Grassland ◽  
Modelling System

scholarly journals Improvement of Methods of Calculations of Flood Water Passing Through Medium-Pressure Hydro Units Taking Into Ac-Count the Characteristics of Flood Wave

2021 ◽  
Vol 43 (2) ◽  
pp. 97-107
Author(s):  
A.V. Panasenko ◽  
◽  
Keyword(s):  
Flood Wave ◽  
Flood Water ◽  
Mike 11 ◽  
Medium Pressure ◽  
Methods Of Calculations

Створено гідродинамічну модель руху паводкових вод на ділянці р. Дністер від гідро­ло­гічного поста Заліщики до Дністровського гідровузла у програмному комплексі MIKE 11. Модель дає змогу визначити рівні у Дністровському водосховищі у будь-який момент часу у вигляді кривих вільної поверхні при пропуску паводків різної забез­печеності. Методика розрахунків пропуску паводків через Дністровський гідровузол на основі прогнозів приточності води з урахуванням характеристик паводкової хвилі та ре­жиму наповнення водосховища дає можливість зменшити максимальні витрати води під час паводкової хвилі через Дністровський гідровузол.

scholarly journals Water balance computation and water quality improvement evaluation for Yanghe Basin in semiarid area of North China using coupled MIKE SHE/MIKE 11 modeling

2021 ◽  
Author(s):  
Ruifen Liu ◽  
Zeshi Li ◽  
Xiaokang Xin ◽  
Defu Liu ◽  
Jialei Zhang ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Improvement ◽  
Pollution Control ◽  
North China ◽  
Hydrological Cycle ◽  
Control Measures ◽  
Semiarid Area ◽  
Mike She ◽  
Water Quality Improvement ◽  
Mike 11

Abstract Water shortage and water pollution are two prominent issues in North China. Understanding hydrological cycle and water-quality changes in response to pollution control measures is fundamental for a better water management there. Using coupled MIKE SHE/MIKE 11 modeling, various hydrological components in Yanghe Basin in semiarid area of North China were quantified for three typical hydrological years and concentrations of COD and TP in a national monitoring section of Yanghe were evaluated with/without pollution control measures. The modeling results show that the underground water storage of Yanghe Basin gets depleted due to evapotranspiration compensation and groundwater utilization regardless of hydrological condition, indicating an unsustainable in-situ water resource utilization. Water quality goals set for Yanghe (COD ≤ 20 mg/L and TP ≤ 0.2 mg/L) can hardly be achieved if pollution control measures are not taken, especially for a dry hydrological year. Depending on hydrological conditions, non-point source control technology-related projects in a 109-km2 village and a 7-km river-channel wetland in mainstream of Yanghe will have a positive effect or negligible effect on water quality improvement. To meet water quality goals, implementation of three wetlands is an effective and economic way.

scholarly journals A hydro-sedimentary modeling system for flash flood propagation and hazard estimation under different agricultural practices

2014 ◽  
Vol 14 (3) ◽  
pp. 625-634 ◽  
Author(s):  
N. N. Kourgialas ◽  
G. P. Karatzas
Keyword(s):  
Sediment Transport ◽  
Flow Velocity ◽  
Water Depth ◽  
Riparian Vegetation ◽  
Flash Flood ◽  
Flood Hazard ◽  
Hydraulic Modeling ◽  
Modeling Framework ◽  
Mike 11 ◽  
Discharge Velocity

Abstract. A modeling system for the estimation of flash flood flow velocity and sediment transport is developed in this study. The system comprises three components: (a) a modeling framework based on the hydrological model HSPF, (b) the hydrodynamic module of the hydraulic model MIKE 11 (quasi-2-D), and (c) the advection–dispersion module of MIKE 11 as a sediment transport model. An important parameter in hydraulic modeling is the Manning's coefficient, an indicator of the channel resistance which is directly dependent on riparian vegetation changes. Riparian vegetation's effect on flood propagation parameters such as water depth (inundation), discharge, flow velocity, and sediment transport load is investigated in this study. Based on the obtained results, when the weed-cutting percentage is increased, the flood wave depth decreases while flow discharge, velocity and sediment transport load increase. The proposed modeling system is used to evaluate and illustrate the flood hazard for different riparian vegetation cutting scenarios. For the estimation of flood hazard, a combination of the flood propagation characteristics of water depth, flow velocity and sediment load was used. Next, a well-balanced selection of the most appropriate agricultural cutting practices of riparian vegetation was performed. Ultimately, the model results obtained for different agricultural cutting practice scenarios can be employed to create flood protection measures for flood-prone areas. The proposed methodology was applied to the downstream part of a small Mediterranean river basin in Crete, Greece.

Simulation of organic carbon loading using MIKE 11 model: a case of River Nzoia, Kenya

2015 ◽  
Vol 10 (2) ◽  
pp. 298-304 ◽  
Author(s):  
Edwin K. Kanda ◽  
Job R. Kosgei ◽  
Emmanuel C. Kipkorir
Keyword(s):  
Lake Victoria ◽  
Agricultural Runoff ◽  
Point Sources ◽  
Low Flow ◽  
Quality Data ◽  
Coefficient Of Determination ◽  
Lake Victoria Basin ◽  
Water Quality Data ◽  
Mike 11 ◽  
Mike 11 Model

River Nzoia is the largest river draining into the Kenyan portion of Lake Victoria. This river receives both point sources of pollution from industrial and municipal wastes, and non-point sources from agricultural runoff in the catchment. The objective of this study was to simulate dissolved oxygen (DO) and biochemical oxygen demand (BOD) of the middle section of River Nzoia using MIKE 11 model. The model was calibrated using discharge and water quality data for 2009 and validated with March–April 2013 data. The model performance was good with coefficient of determination (R2) values of between 0.845 and 0.995, Nash–Sutcliffe efficiency values of between 0.748 and 0.993 and percent bias of less than 10 for both calibration and validation of electrical conductivity (EC), DO and BOD. EC and BOD values were lower for April compared to March which could be attributed to dilution during high flows. DO values were above the recommended minimum level of 4 mg/l in all the sections of the river in the wet period but some sections had lower than 4 mg/l during low flow period. The government agencies such as Water Resources Management Authority and National Environment Management Authority should enforce the effluent standards to ensure that industries and wastewater treatment plants adhere to the maximum allowable limit for BOD and also improve their treatment efficiencies of wastewater plants so as to improve the quality of River Nzoia which is important in the overall management of the Lake Victoria basin.

Flow and Radionuclide Transport From Rock to Surface Systems: Characterization and Modelling of Potential Repository Sites in Sweden

2007 ◽  
Author(s):  
Kent Werner ◽  
Emma Bosson ◽  
Sten Berglund
Keyword(s):  
Surface Water ◽  
Groundwater Flow ◽  
Water Flow ◽  
Exit Point ◽  
Flow Paths ◽  
Near Surface ◽  
Mike She ◽  
Mike 11 ◽  
Surface Water Flow ◽  
Safety Assessments

The safety assessments of potential geological repositories for spent nuclear fuel in Sweden are supported by modelling of groundwater flow in rock, to predict locations (exit points) where radionuclides from the deep repository may enter land, surface waters and associated ecosystems above the rock. This modelling includes detailed rock descriptions, but simplifies the upper part of the flow domain, including representations of meteorological processes and interactions with hydrological objects at the surface. Using the Laxemar candidate site as example, this paper investigates some potentially important consequences of these simplifications. Specifically, it compares particle tracking results obtained by a deep-rock groundwater flow model (CONNECTFLOW) and by MIKE SHE-MIKE 11, which contains detailed descriptions of near-surface/surface water flow. Overall, the models predict similar exit point patterns, occurring as clusters along streams in valleys, at a lake, and in sea bays. However, on a detailed level there are some prediction differences, which may be of importance for biosphere-focused safety assessments. CONNECTFLOW essentially predicts flow paths through the repository that follow fractures and deformation zones, outcropping in valleys. In comparison, MIKE SHE-MIKE 11 provides more detailed information on near-surface water flow paths, including the associated exit points and inputs to assessments of radionuclide retention.

Study on Water Resources in Tioman Island

2012 ◽  
Author(s):  
Hassan Basyri Daulay ◽  
Norhan Abd. Rahman ◽  
Amir Hashim Mohd. Kassim ◽  
Kamarul Azlan Mohd. Nasir
Keyword(s):  
Surface Water ◽  
Water Resources ◽  
Simulation Model ◽  
Tourism Industry ◽  
Small Island ◽  
Groundwater Extraction ◽  
Intensive Study ◽  
Mike 11 ◽  
Surface Water Flow ◽  
Good Potential

Pulau Tioman terletak di sebelah tenggara Negeri Pahang merupakan salah satu dari pulau-pulau kecil di Malaysia yang sudah dimajukan sebagai destinasi pelancong. Berdasarkan penyelidikan terdahulu, pulau ini memerlukan bekalan air bersih melebih 2000 m3/hari untuk keperluan penduduk tempatan dan pelancong, dan keperluan ini akan meningkat dengan peningkatan jumlah penduduk dan pelancong. Penyelidikan terhadap air larian permukaan dan air bumi menunjukkan bahawa keduanya berpotensi sebagai sumber air yang baik untuk memenuhi keperluan air pada masa hadapan. Suatu kajian yang intensif dilaksanakan untuk mengkaji keupayaan sumber air yang sedia ada bagi pulau ini. Untuk menentukan berapa banyaknya air larian permukaan, perisian model MIKE 11 NAM digunakan, dan untuk menentukan keupayaan air bumi yang boleh dipam, ia berpandukan kepada perisian Aquifer Simulation Model (ASM). Kertas kerja ini membentangkan penemuan permulaan bagi jumlah sumber air yang sedia ada di Kg. Tekek Pulau Tioman, purata air larian permukaan harian adalah 3024 m3/hari yang dikira untuk tempoh bulan Februari 1999. Kata kunci: Air larian permukaan; air bumi dan pulau kecil Tioman Island which is situated in the southeast of Pahang State is one of the small islands in Malaysia that have been promoted as a tourism destination. Based on the previous study, the island requires more than 2000 m3/day of water for domestic and tourism industry consumption, and the demand is expected to rise due to the increasing population and tourism activities. Study on surface water and groundwater indicate a good potential for water resources to meet the demand of the future water needs. An intensive study is being carried out to investigate to quantity of water resource that is available in this island. In this study, the amount of surface water flow was estimated by using MIKE 11 NAM Model, and for groundwater extraction ASM (Aquifer Simulation Model) was used. This paper reports the preliminary findings of the amount of the water resources available in Kg. Tekek, Tioman Island, i.e. the daily average of surface runoff is 3024 m3/day and the groundwater extraction is 5003 m3/day, that was calculated for the period of February 1999. Key words: surface water; groundwater and small island

scholarly journals Evaluation of 1D hydraulic models for the simulation of mountain fluvial floods: a case study of the Santa Bárbara River in Ecuador

2019 ◽  
Vol 14 (2) ◽  
pp. 341-354 ◽  
Author(s):  
Juan Pinos ◽  
Luis Timbe ◽  
Edison Timbe
Keyword(s):  
Cross Sections ◽  
Goodness Of Fit ◽  
Reference Model ◽  
Water Levels ◽  
Economic Losses ◽  
Type I ◽  
Efficiency Coefficient ◽  
Type Ii ◽  
Santa Barbara ◽  
Mike 11

Abstract River flooding is a key topic for water managers because of the social and economic losses it can cause. The complex topography and dynamics of mountain rivers has limited the analysis of their behavior during flood events (e.g., sediment transport, flooding). This study aims to test the performance of three hydraulic 1D models (HEC-RAS, MIKE 11, and Flood Modeller) to estimate inundation water levels for a mountain river. The evaluation of these models was performed considering steady state conditions through 10 scenarios, i.e. five discharge return periods, and two types of cross sections data: (a) type I, a detailed field survey complemented with information extracted from DEM, derived from LiDAR; and (b) type II, cross sections exclusively derived from the DEM. The research was conducted for a reach of 5 km of the Santa Bárbara River, with an average slope of 0.25%. HEC-RAS model results for cross sections type I, were previously validated and therefore used as reference for comparison between other models and scenarios. The goodness-of-fit between models was measured based on the Nash-Sutcliffe model efficiency coefficient (EF). The main goal of the current study was to determine the variability of inundation level results compared with a validated model as reference, using the same input data for the three modeling packages. Our analysis shows that, when using cross section type I, the evaluated modeling packages yield similar results (EF were between 0.94 and 0.99). On the other hand, the goodness of fit decreased when using type II data, with an average EF of 0.98 (HEC-RAS), 0.88 (Flood Modeller) and 0.85 (MIKE 11) when compared to the reference model. The authors conclude that it is highly recommend for practitioners to use geometric data type I instead of type II in order to obtain similar performance in the tested models. Only HEC-RAS type II has the same performance as type I models (average EF of 0.98).

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