Présentations Colloques

Poster
5.05
Session 5.05: Groundwater and Ecosystems – Hydrological role of forests and wetlands
Mandi Meriano 15/6
FIELD INVESTIGATION OF SURFACE WATER - GROUNDWATER INTERACTION IN A CANTERBURY LOWLAND CATCHMENT
The balance between development and resource conservation is a major challenge facing many New Zealand communities. The hydrologic cycle of most watersheds in the Canterbury region has undergone a fundamental change due increasing water consumption rates for agriculture and dairy farming and a change in climate towards drier conditions. Since groundwater and surface water are not isolated components of the hydrologic system, development or contamination of one commonly affects the other. Understanding the spatial and temporal dynamics of groundwater/surface water interaction processes remains essential for predicting the sustainability of water resource allocation and management.

Linkages between recharge, discharge, and water quality are revealed using tracer techniques to identify areas with greater vulnerability to increased stresses in Harts Creek – Birdlings Brook catchment in the Lower Canterbury Plains. Interaction between the creek and the local aquifer are identified using detailed stream surveys, temperature surveys and stream flow gauging. Longer term monitoring data including hydrometric measurements, isotopic and geochemical analyses are used to delineate the pattern of groundwater movement between aquifer systems and to develop a flux-based conceptual model for groundwater/surface water interactions.