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Holocene evolution and Anthropocene destruction of the Krishna Delta on the east coast of India: Delta lobe shifts, human impacts, and sea-level history
Marine Geology ( IF 2.6 ) Pub Date : 2020-05-16 , DOI: 10.1016/j.margeo.2020.106229
Kakani Nageswara Rao , Yoshiki Saito , K.Ch.V. Naga Kumar , Sumiko Kubo , Shilpa Pandey , Zhen Li , G. Demudu , A.S. Rajawat

The Holocene evolution of the Krishna Delta was inferred using landform characteristics and 11 sediment cores with 59 Accelerator Mass Spectrometry 14C dates. The landform assemblages in a 5880 km2 area of the Krishna Delta indicate an upper (landward) river-built fluvial plain and a lower (seaward) marine-built beach-ridge plain. Holocene sediment unconformably overlying a Pleistocene basement consists of 11 sedimentary facies, mainly shallowing-upward and deltaic succession. Sea level indicators such as the basal mangrove peat layers above the Pleistocene basement and the foreshore sediments indicate that the sea level rose from −9 m to −3 m during 8.3–6.3 cal ky BP, and stabilised at the present level around 5 cal ky BP. The 3539 km2 area of the Krishna Delta beach-ridge plain developed in five major stages during the last 6 cal ky, with distinct lateral and seaward migration of delta lobes (depocentre shifts). Delta progradation accelerated in the last 500 years, forming an out-building lobate delta. However, predominant erosion along the sediment-starved coast during the past five decades, due to impoundment of riverine inputs at the burgeoning upstream dams, has pushed the Krishna Delta into a persistent destruction phase.



中文翻译:

印度东海岸克里希纳三角洲的全新世演化和人类世破坏:三角洲的波瓣变化,人类影响和海平面历史

克里希纳三角洲的全新世演化是根据地貌特征和11个沉积物岩心和59个加速器质谱法和14 C日期推断出来的。克里希纳三角洲5880 km 2区域中的地貌组合表明,上(陆)河建河床平原和下(海)陆建河床滩脊平原。全新世基底上不整合的全新世沉积物由11个沉积相组成,主要是浅向上和三角洲演替。海平面指示物,如更新世基底之上的基底红树林泥炭层和前滨沉积物表明,在8.3-6.3 cal BP期间,海平面从-9 m上升至-3 m,并稳定在目前的5 ky BP。3539公里2克里希纳三角洲滩脊平原地区在最后6个卡尔基期间经历了五个主要阶段,三角洲的叶向外侧和向海迁移(沉积中心偏移)。在过去的500年中,三角洲的加速发展,形成了一个附属建筑的叶状三角洲。但是,由于上游上游水坝不断蓄积河水,在过去的五十年里,由于沉积物匮乏的海岸沿岸主要侵蚀,使克里希纳三角洲进入了持续的破坏阶段。

更新日期:2020-05-16
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