NDLI: Identification of aquifer and well parameters from step-drawdown tests

Content Provider	Springer Nature Link
Author	Avci, Cem B. Ciftci, Emin Sahin, A. Ufuk
Copyright Year	2010
Abstract	A new analysis technique has been proposed for interpreting transient step-drawdown test data. The proposed method is based on taking the derivative of the drawdown with respect to time for the entire pumping test period to eliminate the time-independent well-loss terms. The derivative function is subsequently integrated to obtain the time-dependent aquifer drawdown as a continuous function. The well-loss parameters are then obtained with higher accuracy once the aquifer behavior is identified. The proposed method is applicable for analyzing data obtained not only from ideal confined aquifers but also from other aquifer types (i.e. unconfined) and non-ideal aquifers (i.e. heterogeneous). The technique was tested for synthetically generated and field data; the proposed approach was noted to provide accurate aquifer and well-loss parameter estimates. The results of the proposed method were compared with those of some of the existing methods for analyzing step-drawdown test data and were found to be more reliable and robust.Une nouvelle technique d’analyse est proposée pour interpréter les données d’essais de descente par palier en régime transitoire. La méthode proposée est basée sur la dérivée du rabattement en fonction du temps pendant toute la durée du pompage d’essai pour éliminer les termes de perte de charge indépendants du temps. La fonction dérivée est ensuite intégrée pour obtenir le rabattement sous la forme d’une fonction continue du temps. Les paramètres de perte de charge sont alors obtenus avec une meilleure précision une fois identifié le comportement de l’aquifère. La méthode proposée est applicable pour analyser des données obtenues non seulement sur des aquifères captifs idéaux, mais aussi sur d’autres types d’aquifères (i.e. libres) et des aquifères non idéaux (i.e. hétérogènes). La technique a été testée avec des données synthétiques et avec des données de terrain; on remarque que l’approche proposée fournit des estimations précises des paramètres de l’aquifère et des pertes de charge du puits. Les résultats de la méthode proposée ont été comparés à ceux obtenus par quelques-unes des méthodes existantes d’analyse d’essais par paliers et se sont révélés plus fiables et solides.Se ha propuesta una nueva técnica de análisis para interpretar de datos de ensayos transitorios de descenso de nivel escalonados. El método propuesta está basado en tomar las derivadas de la depresión con respecto al tiempo para los períodos completos de ensayos de bombeo para eliminar los términos de pérdidas del pozo temporalmente independientes. La función derivada es subsecuentemente integrada para obtener los descensos del acuífero dependiente del tiempo como una función continua. Los parámetros de pérdida del pozo son luego obtenidos con una mayor precisión una vez que es identificado el comportamiento del acuífero. El método propuesto es aplicable para analizar datos obtenidos no solamente a partir de acuíferos confinados ideales sino también para otros tipos de acuífero (por ejemplo no confinado) y acuíferos no ideales (por ejemplo heterogéneo). La técnica fue probada para datos de campo y datos generados sintéticamente; se apreció que el enfoque propuesto provee estimaciones precisas de los parámetros del acuífero y de pérdida de pozo. Los resultados del método propuesto fueron comparados con aquellos de algunos de los métodos existentes para analizar datos de ensayos de descensos escalonados y se encontró que eran más confiables y robustos.本文提出了一种解译瞬时分段降深试验数据的新方法。原理是: 基于降深对整个抽水试验的时间求导, 以消掉与时间无关的井损项, 然后整理导函数, 便得到与时间相关的含水层降深连续函数。一旦含水层特性已知, 就可以更加精确地得到井损参数。这种方法不仅能应用于理想承压含水层的数据分析, 也能用于其它含水层类型 (如非承压含水层) 以及非理想含水层 (如非均质) 的数据分析。采用合成数据与野外数据对该方法进行了测试, 表明其能够精确确定含水层及井损参数。将该方法的结果与现存的方法对分段降深试验数据的分析进行了对比, 表明该方法的分析结果更加可靠。Foi proposta uma nova técnica analítica para a interpretação de ensaios de bombagem não estacionários escalonados. O método proposto baseia-se na extracção da derivada do rebaixamento em ordem ao tempo para todo o período de ensaio de bombagem, a fim de eliminar os termos relativos às perdas no poço independentes do tempo. A função derivada é subsequentemente integrada para obter o rebaixamento no aquífero dependente do tempo, como uma função contínua. Os parâmetros de perdas no poço são então obtidos com maior precisão, uma vez identificado o comportamento do aquífero. O método proposto é aplicável à análise de dados obtidos, não só a partir de aquíferos confinados ideais, mas também de outros tipos de aquíferos (i.e. livres) e aquíferos não ideais (i.e. heterogéneos). A técnica foi ensaiada com dados gerados sinteticamente e com dados de campo; a abordagem proposta mostrou fornecer estimativas precisas dos parâmetros do aquífero e das perdas no poço. Os resultados do método proposto foram comparados com os de alguns dos métodos existentes de análise de dados de ensaios de bombagem escalonados, tendo-se verificado ser mais fiável e robusto.Zamana bağlı kademeli düşüm testi verisinin yorumlanabilmesi için yeni bir analiz yöntemi önerilmiştir. Önerilen yöntem pompa testi süresince elde edilen düşüm değerlerinin zamana göre türevlenlerinin alınması ve bu şekilde zamana bağlı kuyu kayıp terimlerinin yok edilmesi esasına dayanmaktadır. Türev fonksiyonunun integrali alınarak zamana bağlı yeraltı su seviyesi düşümünün sürekli fonksiyonu elde edilir. Bu şekilde akifer davranışının belirlenmesi, kuyu kayıp parametrelerinin daha yüksek bir doğrulukla hesaplanmasına olanak sağlar. Geliştirilen yöntem sadece ideal basınçlı akiferler için değil, diğer akifer tiplerinden (serbest yüzeyli akifer gibi) veya ideal olmayan akiferlerden (heterojen akifer) elde edilen verilerin analizi için kullanılabilir. Sentetik ve gerçek verilerle test edilen yöntemin akifer ve kuyu kayıp parameterini doğru olarak verdiği görülmüştür. Önerilen yöntem ile elde edilen sonuçlar mevcut kademeli düşüm testi yöntemlerilye elde edilenlerle kıyaslanmış, yöntemin daha sağlam ve güvelir olduğu gözlemlenmiştir.
Starting Page	1591
Ending Page	1601
Page Count	11
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	18
Issue Number	7
e-ISSN	14350157
Language	Turkish
Publisher	Springer-Verlag
Publisher Date	2010-06-12
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Step-drawdown test Well loss Derivative analysis Groundwater hydraulics Hydraulic testing Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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Analysis of pumping test data for determining unconfined-aquifer parameters: Composite analysis or not?

Estimating aquifer thickness using multiple pumping tests

Estimation of effective aquifer hydraulic properties from an aquifer test with multi-well observations (Taiwan)

An approach to interpretation of step drawdown tests

Estimation of transmissivity and storage coefficient by means of a derivative method using the early-time drawdown

Evaluation of the streambed leakage concept in analytical models using data from three pumping tests

Comment on “Analysis of pumping test data for determining unconfined aquifer parameters: Composite analysis or not?”: paper published in Hydrogeology Journal (2009) 17:1133-1147, by Hund-Der Yeh and Yen-Chen Huang

Erratum to: An approach to interpretation of step drawdown tests

Reply to Comment on “Analysis of pumping test data for determining unconfined-aquifer parameters: Composite analysis or not?”: paper published in Hydrogeology Journal (2009) 17:1133–1147, by Hund-Der Yeh and Yen-Chen Huang

Identification of aquifer and well parameters from step-drawdown tests

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Reply to Comment on “Analysis of pumping test data for determining unconfined-aquifer parameters: Composite analysis or not?”: paper published in Hydrogeology Journal (2009) 17:1133–1147, by Hund-Der Yeh and Yen-Chen Huang

Identification of aquifer and well parameters from step-drawdown tests