Delimitation of New Zealand hydrologic regions

Mosley, M. P.

doi:10.1016/0022-1694(81)90211-0

Cited by 136 publications

(78 citation statements)

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“…The (broadly speaking) statistical distribution of hydrologic states and fluxes over a larger time-and space scale has been referred to as a system's regime (Pickup and Warner, 1976;Mosley, 1981;Magilligan and Nislow, 2005). This structure has been investigated through the prism of signatures including the flood frequency curve (e.g., Robinson and Sivapalan, 1997), water balance partitioning Harman et al, 2011;Sivapalan et al, 2011a), flow duration curve Yaeger et al, 2012;Ye et al, 2012), recession curve (e.g., Wittenberg, 2003), preferred states in the soil moisture distribution (e.g., Western and Grayson, 2001), and seasonal variations in the fluxes measured at an eddy-flux tower .…”

Section: Variation Across Time: Regimes and Filteringmentioning

confidence: 99%

What makes Darwinian hydrology "Darwinian"? Asking a different kind of question about landscapes

Harman

Troch

2014

Hydrol. Earth Syst. Sci.

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Abstract. There have been repeated calls for a Darwinian approach to hydrologic science, or for a synthesis of Darwinian and Newtonian approaches, to deepen understanding of the hydrologic system in the larger landscape context, and so develop a better basis for predictions now and in an uncertain future. But what exactly makes a Darwinian approach to hydrology "Darwinian"? While there have now been a number of discussions of Darwinian approaches, many referencing Harte (2002), the term is potentially a source of confusion because its connections to Darwin remain allusive rather than explicit.Here we suggest that the Darwinian approach to hydrology follows the example of Charles Darwin by focusing attention on the patterns of variation in populations and seeking hypotheses that explain these patterns in terms of the mechanisms and conditions that determine their historical development. These hypotheses do not simply catalog patterns or predict them statistically -they connect the present structure with processes operating in the past. Nor are they explanations presented without independent evidence or critical analysis -Darwin's hypotheses about the mechanisms underlying present-day variation could be independently tested and validated. With a Darwinian framework in mind, it is easy to see that a great deal of hydrologic research has already been done that contributes to a Darwinian hydrologywhether deliberately or not.We discuss some practical and philosophical issues with this approach to hydrologic science: how are explanatory hypotheses generated? What constitutes a good hypothesis? How are hypotheses tested? "Historical" sciences -including paleohydrology -have long grappled with these questions, as must a Darwinian hydrologic science. We can draw on Darwin's own example for some answers, though there are ongoing debates about the philosophical nature of his methods and reasoning. Darwin used a range of methods of historical reasoning to develop explanatory hypotheses: extrapolating mechanisms, space for time substitution, and looking for signatures of history. Some of these are already in use, while others are not and could be used to develop new insights. He sought explanatory hypotheses that intelligibly unified disparate facts, were testable against evidence, and had fertile implications for further research. He provided evidence to support his hypotheses by deducing corollary conditions ("if explanation A is true, then B will also be true") and comparing these to observations. While a synthesis of the Darwinian and Newtonian approaches remains a goal, the Darwinian approach to hydrologic science has significant value of its own. The Darwinian hydrology that has been conducted already has not been coordinated or linked into a general body of theory and knowledge, but the time is coming when this will be possible.

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Section: Variation Across Time: Regimes and Filteringmentioning

confidence: 99%

What makes Darwinian hydrology "Darwinian"? Asking a different kind of question about landscapes

Harman

Troch

2014

Hydrol. Earth Syst. Sci.

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“…For consistency throughout our paper, we use the former meaning of the term. Mosley (1981) derived hydrologic regionalizations via cluster analyses of hydrologic data. Others (Singh 1971, Cunnane 1988 have predicted flow for regions with reasonably homogeneous flow characteristics by applying regionally representative flows to all catchments in those regions.…”

Section: Predicting Hydrologic Reference Conditionsmentioning

confidence: 99%

Theoretical predictions of observed to expected ratios in RIVPACS-type predictive model assessments of stream biological condition

Yuan

2006

Journal of the North American Benthological Society

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“…The location and scale of individual flood series can be described by two standardized statistics: the specific mean annual flood, QSP, and the coefficient of variation, CV (Mosley, 1981). QSP has an attractive intuitive meaning and can be described as the spatial intensity of the mean annual maximum flood.…”

Section: Derivation Of Basin Clustersmentioning

confidence: 99%

Regional flood frequency analysis II: Multivariate classification of drainage basins in Britain

Wiltshire¹

1986

Hydrological Sciences Journal

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The homogeneity statistic developed in the previous paper (Wiltshire, 1986) is applied here to geographical regions and to clusters of basins formed in a flow-statistic dataspace. Clusters are seen to offer several advantages over geographical regions and they are interpreted in terms of basin characteristics through the use of a multivariate linear discriminant analysis. The discriminant scores of each basin based on basin characteristics can be used to assess the performance of the original independent classification based on flow statistics. An ungauged basin for which a design flood is required can have a fractional membership of more than one cluster, and the desired quantile can then be estimated as a weighted average of quantile estimates from each cluster. Experiments with hypothetical ungauged basins show that the allocation of basins to clusters is in accord with physical reasoning. (Wiltshire, 1986) sont appliquées ici aux régions géographiques et aux groupes de bassins considérés dans un ensemble spatial de données statistiques d'écoulement. On voit que ces groupes pré-sentent plusieurs avantages sur la classification par régions géographiques et on interprète leur caractéristi-ques en fonction des caractéristiques des bassins au moyen de l'utilisation de l'analyse linéaire a multivariates discriminantes. Les résultats discriminants de chaque bassin basés sur ses caractéristiques physiques peuvent être utilisés pour évaluer le caractère plus ou moins performant de la classification indépendante originelle basée sur les statistiques d'écoulement. Un bassin versant non-observe pour lequel on a besoin de l'estimation de la crue du projet peut avoir une participation fractionnaire à plus d'un groupe et le quantile cherché peut être donc évalué comme la moyenne pondérée des évaluations des évalué comme la moyenne pondérée des évaluations des quantiles de chaque groupe. Des essais effectués avec des bassins non-observés hypothétiques montrent que la répartition des bassins parmi les groupes est en accord avec le raisonnement physique. o^t-336 S. E. Wiltshire Analyse

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Delimitation of New Zealand hydrologic regions

Cited by 136 publications

References 1 publication

What makes Darwinian hydrology "Darwinian"? Asking a different kind of question about landscapes

What makes Darwinian hydrology "Darwinian"? Asking a different kind of question about landscapes

Theoretical predictions of observed to expected ratios in RIVPACS-type predictive model assessments of stream biological condition

Regional flood frequency analysis II: Multivariate classification of drainage basins in Britain

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Delimitation of New Zealand hydrologic regions

Cited by 136 publications

References 1 publication

What makes Darwinian hydrology &quot;Darwinian&quot;? Asking a different kind of question about landscapes

What makes Darwinian hydrology &quot;Darwinian&quot;? Asking a different kind of question about landscapes

Theoretical predictions of observed to expected ratios in RIVPACS-type predictive model assessments of stream biological condition

Regional flood frequency analysis II: Multivariate classification of drainage basins in Britain

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Product

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What makes Darwinian hydrology "Darwinian"? Asking a different kind of question about landscapes

What makes Darwinian hydrology "Darwinian"? Asking a different kind of question about landscapes