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Seasonal differences in runoff between forested and non- forested catchments: a case study in the Spanish Pyrenees

机译:森林和非森林集水区径流量的季节性差异:以西班牙比利牛斯山脉为例

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The hydrological response of two neighbouring catchments in the central Spanish Pyrenees with similar lithology and topography but different land use was compared. One catchment (2.84 km2) was extensively cultivated in the past, and the other (0.92 km ) is covered by dense natural forest. Differences in runoff were strongly related to catchment wetness conditions and showed a marked seasonality: under dry conditions runoff tended to be greater in the former agricultural catchment, whereas under wet conditions it tended to be greater in the forested catchment. One explanation for this switching behaviour could be an increase in the hydrological connectivity within the slopes of the forested catchment as it becomes wetter, which favours the release of large amounts of subsurface flow. Differences in land use (vegetation and soil properties) dictate the contrasting dominant runoff generation processes operating in each catchment, and consequently the differences between their hydrological responses.
机译:比较了西班牙比利牛斯山中部两个相邻流域的水文响应,它们具有相似的岩性和地形,但土地用途不同。过去,一个集水区(2.84 km2)被广泛耕种,另一个集水区(0.92 km 2)被茂密的天然林覆盖。径流差异与流域湿度条件密切相关,并显示出明显的季节性:在干旱条件下,前农业流域的径流往往较大,而在湿润条件下,林木流域的径流往往较大。这种转换行为的一种解释可能是森林集水区的山坡变湿时,其水文连通性增加,这有利于释放大量地下流量。土地利用的差异(植被和土壤性质)决定了每个流域的主要径流生成过程形成对比,因此它们的水文响应之间也存在差异。

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