Diagnosing hydrological limitations of a land surface model: application of JULES to a deep-groundwater chalk basin
Diagnosing hydrological limitations of a land surface model: application of JULES to a deep-groundwater chalk basin
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DOI：
10.5194/hess-20-143-2016
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发表时间：
2015-08
影响因子：
6.3
通讯作者：
N. Vine;A. Butler;N. McIntyre;C. Jackson
中科院分区：
文献类型：
--
作者：
N. Vine;A. Butler;N. McIntyre;C. Jackson
抽象。陆面模式（LSMs）是开发全球陆地水、能量和地球化学循环高分辨率模式的潜在起点。然而，LSM存在一些与如何有意义地表示水文通量和储存有关的根本局限性。模型评估和改进的诊断方法是在这里，利用水文专家知识，通过考虑水文系统的主要行为功能，检测LSM不足之处：整体水平衡，在非饱和区的垂直水再分配，时间水再分配，空间水再分配在集水区的地下水和地表水系统。利用三种类型的信息来改善模型的水文：（a）观测，（B）关于区域化数据的预期响应的信息，以及（c）来自独立的物理模型的信息。该研究认为，JULES（联合英国陆地环境模拟器）LSM适用于深层地下水白垩集水区在英国。诊断的水文限制和建议的方法，以解决这些问题是所面临的挑战，而过渡到一个全球高分辨率的水循环模型的指示。
Abstract. Land surface models (LSMs) are prospective starting points to develop a global hyper-resolution model of the terrestrial water, energy, and biogeochemical cycles. However, there are some fundamental limitations of LSMs related to how meaningfully hydrological fluxes and stores are represented. A diagnostic approach to model evaluation and improvement is taken here that exploits hydrological expert knowledge to detect LSM inadequacies through consideration of the major behavioural functions of a hydrological system: overall water balance, vertical water redistribution in the unsaturated zone, temporal water redistribution, and spatial water redistribution over the catchment's groundwater and surface-water systems. Three types of information are utilized to improve the model's hydrology: (a) observations, (b) information about expected response from regionalized data, and (c) information from an independent physics-based model. The study considers the JULES (Joint UK Land Environmental Simulator) LSM applied to a deep-groundwater chalk catchment in the UK. The diagnosed hydrological limitations and the proposed ways to address them are indicative of the challenges faced while transitioning to a global high resolution model of the water cycle.