TY  - JOUR
T1  - Nudging Time-Scale Sensitivity of a Simplified Black Sea CIL Forcing with a Three-Dimensional Idealized Bosphorus Hydrodynamic Model
TT  - Üç boyutlu idealize bir İstanbul Boğazı hidrodinamik Modelinde  Karadeniz Soğuk Ara Tabakası Zorlamasının Zaman Ölçeği Hassasiyeti
AU  - Sözer, Adil
AU  - Özsoy, Emin
PY  - 2019
DA  - August
Y2  - 2019
DO  - 10.35229/jaes.572713
JF  - Journal of Anatolian Environmental and Animal Sciences
JO  - JAES
PB  - Bülent VEREP
WT  - DergiPark
SN  - 2548-0006
SP  - 230
EP  - 242
VL  - 4
IS  - 2
LA  - en
AB  - Hydrodynamics of the Bosphorus Strait is examined under idealizedconditions with a three-dimensional numerical model. In particular, penetrationof a simplified Cold Intermediate Layer (CIL) of the Black Sea into the Straitspecifıed at the boundary is simulated with the aim of testing the sensitivityof the idealized model with respect to nudging strength. Successful penetration of a CIL-likestratification can only be achieved by inflowing nudging time-scales less thanor equal to one day, while the outflowing nudging strength is found to beinsignificant. However, numerical instabilities at the boundary are observedfor strong nudging cases with tnudg ≤ 0.01 day suggestingthat a careful selection of the nudging time-scale is important to achievesuccessful simulations of the CIL even in this highly idealized setup of theBosphorus strait. The presence of CIL altering the temperature distributionwithin the northern section of the idealized channel has a significant impacton the exchange through the strait. CIL reduces the density difference acrossthe strait resulting in decreased layer fluxes and velocities, while atwo-layer sense hydraulic control still holds at the sill.
KW  - Bosphorus
KW  - Cold Intermediate Layer
KW  - Idealized 3d model
N2  - İstanbulBoğazı’nın hidrodinamiği üç boyutlu bir sayısal model marifetiyle idealizekoşullar altında incelenmiş, Karadeniz’in soğuk ara tabakasının (SAT) basitleştirilmişbir halinin idealize modelin kuzey sınırından penetrasyonu simule edilerek modelinaçık sınır koşullarıyla gerçekleştirilen sıcaklık profili zorlamasının zamanölçeğine (tnudg) hassasiyetiaraştırılmıştır. SAT benzeri bir tabakanın boğaza pentrasyonu ancak bir gündenküçük tnudg (sınırdan içeri) değerleri ile mümkün olmuş ve sınır-dışarı tnudgdeğerinin kuvvetinin önemsiz olduğu tespit edilmiştir. Bununla birlikte güçlüzorlama değerleri altında (tnudg ≤ 0.01) kuzey açık sınırında sayısal düzensizlikler meydan gelmiştir, bu daoldukça idealize edilmiş bir Boğaz modeli için bile SAT’ın başarılısimülasyonlarını için zorlama zaman ölçeğinin dikkatlice seçilmesi gerektiğinigöstermektedir. İdealleştirilmiş kanalın kuzeyindeki sıcaklık dağılımınıdeğiştiren SAT’ın varlığı, iki tabakalı değişim akımı üzerinde önemli biretkiye sahiptir. Boğaz’ın kuzey kısmındaki stratifikasyonun değişimi ilekanalın iki ucu arasındaki yoğunluk farkı, ve buna istinaden alt ve üst tabakaakıları ve hızları azalmış olmakla birlikte, iki tabakalı yaklaşıma dayanankuzey eşiğindeki hidrolik kontrol kaybolmamıştır.
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UR  - https://doi.org/10.35229/jaes.572713
L1  - https://dergipark.org.tr/en/download/article-file/792212
ER  -