Robbie Andrew

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A distributed model of water balance in the Motueka catchment, New Zealand


A distributed water balance model is used to simulate the soil moisture regime of the Motueka catchment. The model is a major simplification of the Distributed Hydrology-Vegetation-Soil Model (DHVSM) with modifications suitable for the study area. The model was applied at 25-m resolution with a 1-day time-step for 10 years. The simulated hydrograph showed good correspondence with the observed hydrograph and there was good agreement of simulated and measured mean annual discharges (57.3 m3s-1 as compared with 58.7 m3s-1).

Five different land cover scenarios were used to predict the effects of vegetation change on the hydrological regime: (1) current land cover; (2) prehistoric land cover; (3) maximum pine planting; (4) pine trees on easy slopes; and (5) pine trees on steep slopes. The pine scenarios all reduced the mean annual flow by about 2 m3s-1, while the prehistoric scenario reduced the mean annual flow by about 6 m3s-1. The pine scenarios (3, 4, and 5) reduced the 7-day 5-year low flow from 7.4 m3s-1 to between 6.5 m3s-1 and 6.8 m3s-1, respectively; and the prehistoric scenario reduced the 7-day 5-year low flow to 5.3 m3s-1.

Approximating MRIO

Because of the cost and perceived difficulty of using full multi-regional input–output (MRIO) models to calculate emissions embodied in international trade, many researchers use simpler approaches, making key assumptions and approximations. In this study, Robbie Andrew and colleagues investigate the effects of these approximations and provide advice on their use. Learnámore ╗

How to build an MRIOT from GTAP

Glen Peters and colleagues lay out clearly the method for constructing a multi-regional input-output table using the GTAP (Global Trade Analysis Project) database. Learnámore ╗

Sharing responsibility

The two prevalent approaches to allocating responsibility for greenhouse gas emissions – production and consumption perspectives – push responsibility to either end of the supply chain. In this study, Robbie Andrew and Vicky Forgie present the first national-level application of the shared responsibility perspective. Learnámore ╗

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