Preliminary investigation of emerging suburban landsliding in Gisborne, New Zealand

Author:

Cook Matthew E.1ORCID,Brook Martin S.1ORCID,Tunnicliffe Jon1ORCID,Cave Murry2,Gulick Noah P.1

Affiliation:

1. School of Environment, The University of Auckland, Private Bag 92019, Auckland 1010, New Zealand

2. Gisborne District Council, 15 Fitzherbert Street, Gisborne 4010, New Zealand

Abstract

Recently uplifted, soft Pleistocene sediments in northern New Zealand are particularly vulnerable to landsliding because they are often underlain by less permeable, clay-rich Neogene mudstone–siltstone rocks. Typically, instability is rainfall-induced, often owing to a high-intensity rainfall event from extra-tropical cyclones, following wetter months when antecedent soil moisture has increased. Using remote sensing, field surveys and laboratory testing, we report on some emerging slope instability hazards in the eastern suburbs of the coastal city of Gisborne, on the North Island. Retrogressive failure of the main landslide (at Wallis Road) is continuing and has already led to the abandonment of one dwelling, and an adjacent landslide (at Titirangi Drive) appears to be in an incipient phase of failure. The Wallis Road landslide has been particularly active from mid-2017, with slumping of the headscarp area changing to a constrained mudflow downslope, which then descends a cliff before terminating on the beach. In contrast, the incipient Titirangi Drive landslide at present displays much more subtle effects of deformation. Although activity at both landslides appears to be linked to rainfall-induced increases in soil moisture, this is due to the effects of prolonged periods of rainfall rather than the passage of high-intensity cyclonic storms.

Funder

earthquake commission

Publisher

Geological Society of London

Subject

Earth and Planetary Sciences (miscellaneous),Geology,Geotechnical Engineering and Engineering Geology

Reference51 articles.

1. AS 1289.3.8.1:2006. Methods of testing soils for engineering purposes – soil classification tests – dispersion – determination of Emerson class number of a soil. Standards Australia, Sydney, NSW.

2. Landslides and stratigraphy in the coastal outcrop of the Barton Clay

3. Estimating the timing and location of shallow rainfall-induced landslides using a model for transient, unsaturated infiltration;Baum R.L.;Journal of Geophysical Research: Earth Surfaces,2010

4. A simple ring-shear apparatus;Bromhead E.N.;Ground Engineering,1979

5. Bedding-controlled coastal landslides in Southeast Britain between Axmouth and the Thames Estuary

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3