NDLI: Interplay of geomorphic and hydrogeologic features at reach- and channel unit-scales on riverbed hydrology and hydrochemistry: a conceptual model in the Lower Coal Measures, South Yorkshire, UK

Content Provider	Springer Nature Link
Author	Ibrahim, T. G. Thornton, S. F. Wainwright, J.
Copyright Year	2010
Abstract	A conceptual model of groundwater and surface-water interactions in areas of minor aquifers has been developed. It assesses the interplay of reach-scale subsurface flow paths (RSSF), controlled by the lateral extent of the alluvial valley, and channel unit-scale hyporheic flow paths (CUSHF), controlled by riffle and run/pool sequences, and their impacts on the spatial variability of riverbed flow and solute exchange. A network of riverbed mini-piezometers and multi-level samplers in different reach- and channel-unit scale settings of the River Don (South Yorkshire, UK) is monitored to: (1) estimate vertical hydraulic gradients (VHGs) and specific discharge; (2) discriminate subsurface flow paths from conservative natural tracers; and (3) deduce biogeochemical processes. In a constrained context (downstream end of the alluvial valley), RSSF discharge favours a homogeneous riverbed hydrochemistry with limited biogeochemical processes and shallow CUSHF. In an unconstrained (open alluvial valley) or asymmetric (bedrock outcropping on one bank) context, low VHGs favour deep CUSHF and a vertical stratification of RSSF. Reducing conditions intensify with depth, and superimpose with mixing in riffles. This good approximation of flow and solute behaviour in minor aquifers provides a practical framework to understand nutrient and contaminant fate and develop cost-effective monitoring programmes across the groundwater/surface-water interface.On a développé un modèle des interrelations eau de nappe-eau de surface dans le cas des nappes d’accompagnement. Il évalue l’interaction entre des chenaux de subsurface à l’échelle du bief (RSSF), contrôlé par l’extension latérale de la vallée alluvionnaire et le flux hyporhéique à l’échelle du chenal (CUSHF) dépendant des méandres et successions de biefs et de seuils, ainsi que les impacts de ces interactions sur la variabilité spatiale de l’écoulement dans le lit et échange de soluté. Un réseau de mini-piézomètres rivulaires et d’échantillonneurs à profondeurs multiples répartis sur différents biefs et chenaux de la rivière Don (South Yorkshire, UK) a été suivi pour (1) estimer le gradient hydraulique (VHGs) et la décharge spécifique; (2) différencier les trajectoires de subsurface par traceurs naturels stables et (3) déduire des processus biogéochimiques. Dans un contexte contraignant (rétrécissement aval de la vallée alluviale), la décharge RSSF favorise dans le lit de la rivière une hydrochimie homogène s’accompagnant de processus biogéochimiques réduits et un CUSHF peu profond. Dans un contexte non contraignant (vallée alluviale large) ou asymétrique (lit rocheux affleurant sur une rive), des VHGs bas favorisent des CUSHF profonds et une stratification verticale des RSSF. Les conditions réductrices s’intensifient avec la profondeur, et se surimposent par mélange dans les méandres. Cette bonne approximation du comportement du flux et du soluté dans des aquifères d’accompagnement fournit un cadre pratique pour comprendre l’évolution des nutriments et des contaminants et déveloper des programmes rentables de suivi le l’interface eau de surface-eau souterraineSe desarrolló un modelo conceptual de la interacción de aguas superficiales y aguas subterráneas en áreas de acuíferos menores. Este modelo evalúa la interacción a la escala de tramos de las trayectorias del flujo subsuperficial (RSSF), controlados por la extensión lateral del valle aluvial, y a escala unidad del canal la trayectoria de flujo hiporreico (CUSHF) controlado por rápidos y secuencias de cursos y encharcamientos, y sus impactos en la variabilidad espacial del flujo y el intercambio de soluto en el lecho del río. Se monitoreó una red de mini-piezómetros en el lecho del río y muestreadores mutiniveles en diferentes localizaciones de escenarios a escala de tramo y de canal del Río Don (South Yorkshire, Reino Unido) para: (1) estimar los gradientes hidráulicos verticales (VHGs) y la descarga específica; (2) discriminar las trayectorias de flujo subsuperficial a partir de trazadores naturales conservativos; y (3) deducir los procesos biogeoquímicos. En un contexto restringido (extremo aguas abajo del valle aluvial), la descarga RSSF favorece una hidroquímica homogénea en el lecho del río con procesos biogeoquímicos limitados y CUSHF somero. En un contexto no restringido (valle aluvial abierto) o asimétrico (afloramiento de basamento en una margen), bajos VHGs favorecen un CUSHF profundo y una estratificación vertical de RSSF. Las condiciones de reducción se intensifican con la profundidad, y se superponen con mezclas en los rápidos. Esta buena aproximación del comportamiento del flujo y del soluto en acuíferos menores provee un marco práctico para entender el destino de los nutrientes y los contaminantes y desarrollar programas de monitoreo de costo-efectividad a través de la interfase agua subterránea/agua superficial.本文建立了含水层少的地区的地下水和地表水相互作用的概念模型。它评价了受冲积河谷水平分布控制的次流域尺度地下水流路径 (RSSF) 与受浅滩和径/塘序列控制的河段尺度底流路径 (CUSHF) 间的相互作用以及它们对河床水流和溶质交换的空间变化的影响。位于Don河 (英国的约克郡南部) 不同的次流域和河段尺度条件下网络化的河床小型水流压力计和多水平采样器用于监测: 1) 估算垂向水力梯度 (VHGs) 和单位排泄量, 2) 利用稳定的天然示踪剂判断地下水流以及, 3) 推断生物地球化学过程。在受约束的背景条件下 (冲积河谷最下游), 次流域尺度地下水流路径排泄更容易发生在具有有限的生物地球化学过程的水化学均一的河床处以及浅部的河段尺度底流路径处。在无约束的背景条件下 (开阔的冲积河谷) 或者非对称的背景下 (其中一个河岸有基岩裸露), 较低的垂向水力梯度更容易发生在较深的河段尺度底流路径 (CUSHF) 和具有垂向分层的次流域尺度地下水流路径 (RSSF) 处。还原条件随深度增加, 并在浅滩处与混合作用相叠加。这种用于含水层较少地区的水流和溶质行为的近似方法为理解营养物和污染物的归宿和设计跨地下水/地表水界面的经济高效的监测方案提供了一个适用的框架。Foi desenvolvido um modelo conceptual das interacções entre a água subterrânea e a água superficial em áreas de pequenos aquíferos. Avaliam-se as relações dos escoamentos subsuperficiais à escala de trecho fluvial (ESETF) controlados pela extensão lateral do vale fluvial, com os escoamentos hiporreicos à escala da unidade canal (EHEUC) controlados pelas zonas sequenciais de rápido, escoamento normal e de estagnação, e os seus impactes na variabilidade espacial do escoamento e nas trocas de solutos através do leito. Foi monitorizada uma rede de mini-piezómetros e de amostradores multi-nível instalados em leito fluvial em diferentes contextos de trecho e unidade canal fluvial no rio Don (Yorkshire do Sul, Reino Unido) para: (1) estimar os gradientes hidráulicos verticais (GHV) e os caudais específicos; (2) discriminar os escoamentos subterrâneos a partir de traçadores naturais conservativos; e (3) deduzir processos biogeoquímicos. Num contexto restringido (extremidade jusante do vale aluvial), a descarga dos ESETF favorece uma hidrogeoquímica homogénea no leito fluvial, com processos biogeoquímicos limitados, e EHEUC superficiais. Em contextos não restringidos (vale aluvial aberto) ou assimétricos (embasamento aflorante numa das margens), baixos GHV favorecem EHEUC profundos e estratificação vertical dos ESETF. As condições redutoras intensificam-se em profundidade e adicionam-se com as de mistura nas zonas de rápidos. Esta boa aproximação entre o comportamento do escoamento e dos solutos em aquíferos pequenos providencia um esquema prático para perceber o destino dos nutrientes e dos contaminantes e para desenvolver programas de monitorização económicos através da interface água subterrânea/água superficial.
Starting Page	1391
Ending Page	1411
Page Count	21
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	18
Issue Number	6
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2010-06-29
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater/surface-water relations Hyporheic zone Water Framework Directive, multi-scale UK 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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