International Seminar on Soil Erosion and Riverine Sediment in Mountainous Regions
International famous soil erosion and river sediment research experts from Asia, Europe, the America and other regions will be invited to give main reports and panel discussion on this seminar. The climate changing impact, new trends, new progress and new problems of the soil erosion and river sediment in mountainous regions will be discussed, and new countermeasures against the influence of climate change will be discussed also.
Soil erosion and river sediment research belongs to natural sciences. Soil erosion is one of the most widely distributed environmental problems in the world, which poses a great threat to world food security and ecological environment. With the global climate change, the development and evolution process of soil erosion types, intensity and influencing factors in alpine regions have also changed greatly, which affects the sediment transport in alpine regions and its downstream rivers and the design and operation of water conservancy and hydropower projects.
Discussion on the progress and new countermeasures against the influence of climate change (SDGs 13) on soil erosion and river sediment in alpine regions not only accords with the important direction of international soil erosion basic research, but also meets urgent demand of water resource security (SDGs 6) in mountainous areas.
Soil erosion and river sediment research has always been a basic scientific issue of global concern. Soil erosion and river sediment in alpine regions have strong response to climate change, and have great influence on the local ecological environment, sediment transport of downstream rivers and design and operation of water conservancy and hydropower projects, which has become a new hot issue for scientists all over the world.
This activity will strengthen the communication between the soil erosion and river sediment scientists worldwide, promote global cooperation among scientists, governments and enterprises, popularize the UNESCO and SDGs, and add with new perspectives from soil erosion and river sediment in mountainous regions to the relevant SDGs.
- Study on the history and rate of gully erosion in typical small watershed of black soil region based on UAV remote sensing and 137Cs tracer
Speakers:Yanru Wen - Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences
- Simulation and estimation of natural runoff in China
Speakers:Chiyuan Miao - Beijing Normal University
- A little experience of national fund application
Speakers:Guanghui Zhang - Beijing Normal University
- Da Dao Zhi Jian - CCHZ-DISO Big Data and Model evaluation System
Speakers:Zengyun Hu - XinJiang Institute of Ecology and Geography Chinese Academy of Sciences
- Multi-scale hydrological process monitoring and eco-hydrological simulation in Qilian Mountains
Speakers:Baoqing Zhang - Lanzhou University
- Long-term response of runoff and sediment load to spatiotemporally varied rainfall in the Lhasa River basin, Tibetan Plateau
- Fluvial runoff and sediment play vital roles in channel evolution, material cycling, water resource utilization and ecological environment. In the context of global climate change, the assessment of runoff and sediment in response to climate change is of great signiﬁcance for water and soil conservation, especially in alpine regions such as the Tibetan Plateau with limited availability of long-term observed data. In this study, based on the available records for the period 1980–2018, the spatiotemporal variations in rainfall-related parameters (rainfall and rainfall erosivity (RE)), and their impacts on the runoff–sediment load (SL) process were investigated in the Lhasa River Basin (LRB) by cross-coherence analysis. In addition, the individual and combined effects of other regional environmental factors (e.g., temperature, snow water equivalent (SWE) and vegetation) on runoff and SL were quantitatively identiﬁed using partial least squares structural equation modeling (PLS-SEM). The results showed that the changes in rainfall-related parameters experienced an upward trend at a rate of 3.59 mm/decade (rainfall amount) and 46.05 MJ⋅mm⋅ha-1⋅h-1/decade (RE), respectively. The regions with the most obvious increase occurred in downstream of LRB. However, runoff displayed an insigniﬁcant decreasing trend, together with increasing water inputs from the wetter climate in the middle and lower reaches. The contrasting SL trends were found in the middle (signiﬁcantly descending: 5.5 × 104 t/decade) and downstream reaches (slightly increasing: 19.27 × 104 t/decade). Rainfall-related parameters generally played a positive role in runoff and SL at all hydrological stations, and their action gradually weakened after 2005 despite still being the dominant factor. Other environmental variables, such as vegetation, did not limit runoff but did reduce the SL with an increase in vegetation coverage in the LRB, where large-area vegetation restoration projects were implemented and mainly distributed on the sandy land and ﬂoodplain.
Speakers:Donghong Xiong-Institute of Mountain Hazard and Environment-CAS
- Water stress of Asia's water tower
- Water resources sustainability in High Mountain Asia (HMA) surrounding the Tibetan Plateau (TP)—known as Asia’s water tower—has triggered widespread concerns because HMA protects millions of people against water stress. However, the mechanisms behind the heterogeneous trends observed in terrestrial water storage (TWS) over the TP remain poorly understood. Here we use a Lagrangian particle dispersion model and satellite observations to attribute about 1 Gt of monthly TWS decline in the southern TP during 2003–2016 to westerlies-carried deficit in precipitation minus evaporation (PME) from the southeast North Atlantic. We further show that HMA blocks the propagation of PME deficit into the central TP, causing a monthly TWS increase by about 0.5 Gt. Furthermore, warming-induced snow and glacial melt as well as drying-induced TWS depletion in HMA weaken the blocking of HMA’s mountains, causing persistent northward expansion of the TP’s TWS deficit since 2009. Future projections under two emissions scenarios verified by satellite observations during 2020–2021 indicate that, by the end of the twenty-first century, up to 84% (for scenario SSP245) and 97% (for scenario SSP585) of the TP could be afflicted by TWS deficits. Our findings indicate a trajectory towards unsustainable.
Speakers:Qiang Zhang - Beijing Normal University
- Frontier problems and progress of ecological hydrology in cold regions
- Understanding and quantitative simulation of eco-hydrological processes and driving mechanisms in cold regions is the key to systematically solve many ecological and environmental problems faced by cold regions under the synergetic effect of climate change and cryosphere change. This report focuses on the international frontier scientific issues such as SPAC hydro-thermal coupling transfer process in cold regions, key processes of water cycle in permafrost-ecological coupling, runoff formation mechanism and simulation in permafrost basins, and carbon transport process and attribution in permafrost basins. It systematically introduces the major advances in these three aspects, and reviews the frontier challenges of existing theories and methods and their future development directions.
Speakers:Genxu Wang - Institute of Mountain Hazard and Environment - CAS
Baoqing Zhang - Lanzhou University
Chiyuan Miao - Beijing Normal University
Donghong Xiong-Institute of Mountain Hazard and Environment-CAS
Genxu Wang - Institute of Mountain Hazard and Environment - CAS
Guanghui Zhang - Beijing Normal University
Qiang Zhang - Beijing Normal University
Yanru Wen - Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesYanru Wen - Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences
Zengyun Hu - XinJiang Institute of Ecology and Geography Chinese Academy of Sciences