Modelling the effect of land management interventions and climate change on sediment loads in the Manawatū–Whanganui region

Basher, Les; Spiekermann, Raphael; Dymond, J. R.; Herzig, Alexander; Hayman, Ella; Ausseil, Anne-Gäelle

doi:10.1080/00288330.2020.1730413

Cited by 13 publications

(4 citation statements)

References 33 publications

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“…Though slowing the rate and impacts of climate change is a global effort, land-based mitigation strategies can help reduce coastal erosion in some cases. For example, while climate change is expected to increase sedimentation up to 224% by 2090 in some regions of New Zealand (Basher et al, 2020), local initiatives to manage coastal development and farming practices, and replant catchments and coastlines, aim to offset the impacts of climate change on sedimentation.…”

Section: Implications Of Coastal Darkeningmentioning

confidence: 99%

Coastal darkening substantially limits the contribution of kelp to coastal carbon cycles

Blain

Hansen

Shears

2021

Global Change Biology

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Section: Implications Of Coastal Darkeningmentioning

confidence: 99%

Coastal darkening substantially limits the contribution of kelp to coastal carbon cycles

Blain

Hansen

Shears

2021

Global Change Biology

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“…Following arrival by European settlers in the 1800s, extensive deforestation for pastoral farming resulted in a geomorphic landscape response consisting of high erosion and sedimentation rates [1][2][3][4][5]. Increased erosion rates have led to a variety of adverse consequences, including i) reduced land productivity, ecosystem services, and food security through loss of productive soil; ii) increased damage to infrastructure; iii) adverse impacts on water quality and aquatic ecosystems from increased sediment delivery to streams; and iv) negative impacts for cultural values related to soil and aquatic environments [6][7][8][9][10][11][12][13]. Erosion processes in New Zealand remain very active [14], due to a predisposed natural environment with steep slopes, weak sedimentary rocks, and a climate featuring high annual rainfall and relatively frequent high magnitude rainfall events [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Drivers and New Opportunities for Woody Vegetation Use in Erosion Management in Pastoral Hill Country in New Zealand

McIvor¹,

Mackay-Smith²,

Spiekermann³

2024

Soil Erosion - Risk Modeling and Management

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Increases in the magnitude and frequency of rainfall events in New Zealand due to climate change, coupled with existing concerns about sediment and nutrient contamination of waterways, are changing policy and practice around erosion management and land use. We describe the challenges around slope erosion reduction, cover current legislation and management practices, illustrate how modeling can inform erosion management and describe new opportunities, whereby native species can become a new active management tool for erosion control. Passive erosion management depending on natural revegetation by slow growing woody species is used on land retired from grazing but is much less effective than active erosion management in reducing shallow slope erosion. Active erosion management using exotic fast-growing poplar and willow trees strategically placed on hillslopes is effective in reducing erosion, but these trees can be hard to establish on drier upper slopes. An endemic woody tree, Kanuka, grows on drier slopes and is being tested as an erosion control tool. Kanuka seedlings have been successfully established on pastoral slopes, including drier slopes. A spatial decision support tool developed to identify pastoral hillslopes at high risk of erosion has improved decision-making when positioning appropriate trees on these slopes.

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“…Therefore, a hot topic is distinguishing the contribution rate of climate change and human activities to the variations in runoff and sediment load in a basin [4][5][6]. In order to clarify the relationship between climate change and the trend in runoff and sediment load, a large number of studies have been successfully carried out in the Yellow River, Yanhe River, Manawatu River, and Mekong River, among others, using the sequence test and regression model methods [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Runoff and Sediment Load Changes in the Wuding River Basin from 1960 to 2020

et al. 2022

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To investigate changes in runoff and sediment load in the Wuding River basin under the combined influence of climate change and human activities, trends were analyzed from 1960 to 2020, and the contribution rate of climate change and human activities was calculated. It was observed that the runoff and sediment load Mann–Kendall test value ranges at eight gauging stations were −7.42 to −3.88 and −9.28 to −3.34, respectively, indicating a significant decreasing trend in both. During the period of 1970–2000, the contribution of human activities to the reduction in runoff and sediment load was 69.9% and 75.3%, respectively. However, the impact of human activities intensified after 2001 due to the implementation of the policy of returning farmland to forests in the Wuding River basin, which contributed to 118.4% and 114.5% of the reduction in runoff and sediment load, respectively. Check dam and reservoir construction, reforestation, water diversion, and other human activities were all important factors in runoff and sediment load reduction. In particular, the total sediment retention by reservoirs in the Wuding River basin was approximately 879 million tons until 2010, and the total sediment retention by check dams was approximately 2747 million t until 2017. This study can provide support for the utilization of water resources and the construction of ecological civilization in the Wuding River basin, and can also provide a reference for the study of water and sediment changes in other basins.

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Modelling the effect of land management interventions and climate change on sediment loads in the Manawatū–Whanganui region

Cited by 13 publications

References 33 publications

Coastal darkening substantially limits the contribution of kelp to coastal carbon cycles

Coastal darkening substantially limits the contribution of kelp to coastal carbon cycles

Drivers and New Opportunities for Woody Vegetation Use in Erosion Management in Pastoral Hill Country in New Zealand

Factors Affecting Runoff and Sediment Load Changes in the Wuding River Basin from 1960 to 2020

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