A New Inverse Solution Assessment for the Recovery Test Using Radial Basis Function Collocation Method

Şahin, Abdurrahman

doi:10.1007/s11269-015-1201-x

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…The Radial Basis Function Collation Method (RBFCM) (i.e. [24]) is recommended to fit the discrete test data. For instance, if (𝑡 1 , 𝑠 1 ) , (𝑡 2 , 𝑠 2 ) and (𝑡 𝑖 , 𝑠 𝑖 ) pairs are not available in the recorded test data, RBFCM is able to produce these values very accurately.…”

Section: Discussionmentioning

confidence: 99%

Leaky strip aquifer parameter estimation by ratio matching process

Şahin¹

2023

Pamukkale J Eng Sci

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In this study, a novel estimation method, called as Ratio Matching Process (RMP), was proposed to determine the hydrologic parameters of a leaky strip aquifer. RMP employs two simple formulations in order to simplify the parameter estimation procedure. The first formula gives the leakage factor from the site data by selecting two different timedrawdown measurements, which are separated by the user-specified distance from the inflection point of the drawdown vs logarithmic time curve. The second formula provides the users to find the dimensionless inflection point from the leakage factor. Thus, the aquifer parameters could be easily acquired with RMP by avoiding the classical curve matching process. The capability of RMP was studied with several hypothetical pumping test scenarios including ideal and noisecontaminated datasets. The results from the implemented cases indicate that RMP can be regarded as a good alternative to the available methods.Bu çalışmada, Oran Eşleştirme İşleyişi (OEİ) adı verilen sızdıran şerit akiferinin hidrolojik parametrelerinin belirlenmesi için yeni bir tahmin yöntemi önerilmiştir. OEİ, parametre tahmin sürecini kolaylaştırmak için iki basit formül kullanır. Birinci formül, su düşümü-logaritmik zaman eğrisinin büküm noktasından bir kullanıcı tarafından belirlenen mesafe ile ayrılan iki farklı su düşüm ölçümünden sızdırma faktörünü verir. İkinci formül, kullanıcıların sızdırma faktöründen boyutsuz büküm noktasını bulmasını sağlar. Böylece, akifer parametreleri OEİ ile klasik eğri eşleştirme işleyişinden kaçınarak kolayca elde edilebilir. OEİ'nin kabiliyeti çeşitli ideal ve gürültü ile kirletilmiş hipotetik pompaj testi senaryoları ile çalışılmıştır. İncelenen durumdan elde edilen sonuçlar OEİ'nin hali hazırdaki mevcut yöntemlere iyi bir alternatif olarak değerlendirilebileceğini göstermektedir.

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Section: Discussionmentioning

confidence: 99%

Leaky strip aquifer parameter estimation by ratio matching process

Şahin¹

2023

Pamukkale J Eng Sci

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“…Ciftci et al, 2012), non‐linear equation solver in the groundwater inverse problem (i.e. Sahin, 2016) and parameter estimation (i.e. Şahin & Çiftçi, 2023).…”

Section: Methodsmentioning

confidence: 99%

Identification of sinkhole‐prone zones by successive coincidence deficit index analysis

Şahin,

Ozkaya

2024

Hydrological Processes

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Hydrological data‐driven models require the time series of several hydrological events with different time resolutions. The interpretation of any time series event is generally difficult without some sort of filtering or converting it to a single index value. The simultaneous analysis of two or more hydrological events over a definite time span may be more informative about the region of interest. For this purpose, a new index, referred to as the successive coincidence deficit index (SCDI), was introduced to identify sinkhole‐prone regions using the persistent water deficit concept. In this study, monthly integrated multi‐satellite retrievals for GPM based precipitation (P) and gravity recovery and climate experiment‐based groundwater storage (GWS) datasets over Konya Closed Basin (KCB) in Türkiye were used to analyse the sinkhole occurrence. The main finding of this study is that SCDI distribution with high index values, concentrated on the southwestern part of KCB, is in line with the sinkholes occurred mainly after 2010. The proposed SCDI could also serve as a kind of drought index, which enables practitioners to quantify the relationship between drought and sinkhole occurrence. Moreover, the event coincidence analysis was utilized to detect deficiency in GWS over the KCB, which was associated with a rate of 0.8 for P deficiency, and this rate reaches up to 0.9 in the sinkhole region analysed in this study. As a conclusion, the proposed methodology can detect sinkhole‐prone regions to construct risk maps for stakeholders, policymakers, and end users.

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An integration-based estimation approach for the determination of slug test parameters under various flow geometries

Şahin

Çiftçi

2016

Arab J Geosci

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A New Inverse Solution Assessment for the Recovery Test Using Radial Basis Function Collocation Method

Cited by 5 publications

References 28 publications

Leaky strip aquifer parameter estimation by ratio matching process

Leaky strip aquifer parameter estimation by ratio matching process

Identification of sinkhole‐prone zones by successive coincidence deficit index analysis

An integration-based estimation approach for the determination of slug test parameters under various flow geometries

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