Hydrologic recovery in forest landscapes

土地利用的变化可能对可持续水资源管理构成严重挑战，这反过来又需要关于各种水文组成部分在受到干扰(水文恢复)后恢复其原始状态所需时间的信息。我提出了一种实验-模型相结合的方法，以检查安大略省南部橡树岭莫雷恩山顶(该地区的关键水文地质特征)上管理的森林景观(Ganaraska森林)的水文恢复情况。我试图了解主要土地覆盖之间的水文特性和过程有何不同，并确定在该区域气候变化的背景下，它们如何随着水文恢复而变化。森林提供了不同类型和不同年龄的农田和林地的镶嵌，它们位于相同气候下的类似土壤和地表地质沉积物上，这有助于研究景观的关键水文成分如何随林龄变化(替代水文恢复)。将对不同类型和不同年龄的非林区和林地的水储存和通量(如截留、地表径流、补给)进行检查。将对估算补给量的其他方法进行评估，以确定它们为加拿大橡树岭、Moraine以及其他关键地下水补给区提供具有成本效益和空间分布的补给量估测的潜力。该实地计划将提供数据，以对水的渗透、储存和补给模型进行参数化和测试，这些模型将在不同的气候条件下运行，以检查土地覆盖、气候、地形、土壤和水文地质之间的相互作用，以控制这一景观的水文恢复。这项工作将对森林地貌的水文恢复进行综合实地和基于模型的研究，解决长期尺度上森林水平衡的所有方面问题。由此产生的信息和补给估计工具将有助于对橡树岭、Moraine以及加拿大目前正在经历自然和人为影响的其他森林景观的水资源管理。

Land use change can pose serious challenges for sustainable water resource management, which in turn requires information on the time needed for various hydrologic components to return to their original condition after disturbance (hydrologic recovery). I propose a combined experimental-modelling approach to examine hydrologic recovery in a managed forest landscape in southern Ontario (the Ganaraska Forest) on the crest of the Oak Ridges Moraine, a key hydrogeologic feature of the region. I seek to understand how hydrologic properties and processes differ between dominant land covers, and establish how they change with hydrologic recovery in the context of a changing climate in this region. The Forest provides a mosaic of agricultural land and forest stands of differing type and age on similar soils and surficial geologic deposits under the same climate that facilitates the study of how the landscape's key hydrologic components change with forest age (a surrogate of hydrologic recovery). Water storage and fluxes (e.g. interception, surface runoff, recharge) will be examined for non-forested areas and forest stands of differing type and age. Alternative approaches to estimating recharge will be assessed to establish their potential for providing cost-effective and spatially-distributed recharge estimates for the Oak Ridges Moraine as well as other critical groundwater recharge areas in Canada. The field program will provide data to parameterize and test models of water infiltration, storage and recharge that will be run under different climatic conditions to examine interactions between land cover, climate, topography, soils and hydrogeology in controlling hydrologic recovery in this landscape. This work will provide an integrated field and modelling-based study of the hydrologic recovery of forest landscapes that addresses all aspects of the forest water balance over long time scales. The resulting information and recharge estimation tools will assist water resource management on the Oak Ridges Moraine as well as in other forest landscapes in Canada currently experiencing natural and human-induced impacts.