NDLI: The use of wetland water balances to link hydrogeological processes to ecological effects

Content Provider	Springer Nature Link
Author	Gasca, David Ross, Don
Copyright Year	2008
Abstract	A methodology for modelling wetland water levels using the water balance approach was developed for Pulborough Brooks Site of Special Scientific Interest in West Sussex, in the UK. The methodology was applied to assess potential groundwater abstraction impacts on communities and species of ecological importance in the wetland. The modelling methodology links regional hydrogeological processes to wetland hydrology and ecology that is typically influenced by processes that take place at a more reduced spatial scale. To assess impacts, it is necessary to understand the hydrological sources of water that are affected by abstraction as well as to consider how the magnitude of these processes relates to other processes that influence wetland water levels. Water levels are commonly the most important factor determining the presence or absence of species or communities in a wetland and the model predicts wetland water levels and assesses how suitable these water levels are for species of ecological significance. Model results show that typical historic rates of abstraction have not resulted in an adverse effect on the integrity of the Pulborough Brooks relative to a ‘natural’ (no abstraction) scenario.Une méthode de modélisation des niveaux d’eau dans les zones humides utilisant une approche par le bilan d’eau a été développée pour le Pulborough Brooks Site of Special Scientific Interest dans l’Ouest du Sussex, au Royaume Uni. La méthodologie a été utilisée pour évaluer l’impact potentiel du prélèvement d’eau souterraine sur les populations et les espèces importantes du point de vue de l’écologie dans les zones humides. La méthodologie de la modélisation relie les processus hydrogéologiques à l’hydrologie et à l’écologie des zones humides qui est influencée comme d’habitude par les processus qui prennent place à une échelle spatiale plus réduite. Afin d’évaluer les impacts, il est nécessaire de comprendre les origines hydrologiques de l’eau qui sont affectées par les prélèvements mais aussi d’examiner comment l’ampleur de ces processus est en relation avec d’autres processus qui ont une influence sur les niveaux d’eau dans les zones humides. Les niveaux d’eau sont en général le facteur le plus important déterminant la présence ou l’absence d’espèces ou de populations dans une zone humide et le modèle prédit les niveaux d’eau dans les zones humides et évalue dans quelle mesure ces niveaux d’eau sont propices aux espèces significatives du point de vue de l’écologie. Les résultats fournis par le modèle montrent que les taux de prélèvement historiques caractéristiques n’ont pas eu de conséquence préjudiciable pour l’intégrité du Pulborough Brooks en se référant à un prélèvement « naturel » (pas de prélèvement).Se desarrolló una metodología para modelar los niveles de agua en un humedal utilizando el planteo de un balance de agua para el sitio Pulborough Brooks, de especial interés científico en West Sussex en el Reino Unido. La metodología fue aplicada para evaluar los posibles impactos de la extracción de aguas subterráneas en las comunidades y especies de importancia ecológica en el humedad. La metodología de modelado asocia los procesos hidrogeológicos regionales a la hidrología y ecología del humedal, que está típicamente influenciada por procesos que ocurren en una escala espacial más reducida. Para evaluar los impactos, no sólo es necesario entender las fuentes hidrológicas del agua que están afectadas por la explotación, sino también considerar de que manera la magnitud de estos procesos se relaciona a otros procesos que influyen en los niveles de agua del humedal. Los niveles de agua son comúnmente el factor más importante que determina la presencia o ausencia de especies o comunidades en un humedal y el modelo predice los niveles de agua en el humedal y evalúa cuán apropiados son estos niveles de agua para las especies de importancia ecológica. Los resultados del modelo muestran que los típicos ritmos históricos de extracción de agua no han tenido efectos adversos sobre la integridad del Pulborough Brooks en relación a un escenario natural (sin explotación).在英国西萨塞克斯郡Pulborough Brooks具有特殊科学意义的场区开发了一种应用水均衡法模拟湿地水位的方法。应用该方法来评价地下水开采对湿地中有生态意义的群落和种群的潜在影响。该模拟方法将区域水文地质过程同湿地水文和生态联系起来, 后者通常受到更小空间尺度水文地质过程的影响。为评价这些影响, 必须了解受抽水影响的水源, 还要考虑这些过程相对于影响湿地水位的其他过程的量级。水位通常是决定湿地中种群或群落存在与否的最重要的因素, 模型预测了湿地水位, 评估了其对于有生态意义的种群的适宜性。模拟试验结果表明, Pulborough Brooks地区历史上代表性的抽水强度没有对“天然” (无抽水) 状态的生态完整性造成不良影响。Foi desenvolvida uma metodologia para modelar níveis de água de uma zona húmida, utilizando o método do balanço de água, no Sítio de Interesse Científico Especial dos Ribeiros de Pulborough, na zona Oeste de Sussex, Reino Unido. Esta metodologia foi aplicada para avaliar o impacte potencial da extracção de água subterrânea nas comunidades e espécies com valor ecológico da zona húmida. A metodologia de modelação relaciona processos hidrogeológicos regionais com a hidrologia da zona húmida e respectiva ecologia, tipicamente influenciada pelos processos que ocorrem a menor escala espacial. De forma a avaliar os impactes é necessário compreender as fontes hidrológicas de água que são afectadas pela extracção de água subterrânea e, também, ter em conta como se relaciona a magnitude destes processos com outros processos que influenciam os níveis de água da zona húmida. Os níveis de água são geralmente o factor mais importante que condiciona a presença ou ausência de espécies ou comunidades da zona húmida, e o modelo prediz os níveis de água da zona húmida e avalia quão apropriados são os níveis de água para as espécies com valor ecológico. Os resultados do modelo revelam que as taxas de extracção históricas típicas não produziram um efeito negativo na integridade dos Ribeiros de Pulborough relativamente a um cenário “natural” (sem extracção).
Starting Page	115
Ending Page	133
Page Count	19
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	17
Issue Number	1
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2009-01-16
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	UK Wetlands Ecology Numerical modelling Ground/surface water relations 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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