Ecosystem Services from Tonle Sap Flood Pulse: Spatial and Economic Analysis in Aek Phnom and Sangkae Districts of Battambang Province, Cambodia

2018 ◽  
pp. 123-151
Author(s):  
Kimchhin Sok ◽  
Philippe Méral ◽  
Didier Pillot ◽  
Stéphanie Defossez
Keyword(s):  
Ecosystem Services ◽  
Economic Analysis ◽  
Flood Pulse ◽  
Tonle Sap

Multidecadal variability of the Tonle Sap Lake flood pulse regime

2021 ◽  
Author(s):  
Aifang Chen ◽  
Junguo Liu ◽  
Matti Kummu ◽  
Olli Varis ◽  
Qiuhong Tang ◽  
...  
Keyword(s):  
Flood Pulse ◽  
Pulse Regime ◽  
Multidecadal Variability ◽  
Tonle Sap Lake ◽  
Tonle Sap

scholarly journals Mollusc fisheries and length–weight relationship in Tonle Sap flood pulse system, Cambodia

2018 ◽  
Vol 54 ◽  
pp. 34 ◽  
Author(s):  
Peng Bun Ngor ◽  
Ratha Sor ◽  
Leang Hour Prak ◽  
Nam So ◽  
Zeb S. Hogan ◽  
...  
Keyword(s):  
Annual Variation ◽  
Flood Pulse ◽  
Growth Patterns ◽  
Water Levels ◽  
Relationship Analysis ◽  
Weight Relationship ◽  
Daily Data ◽  
Tonle Sap ◽  
Mollusc Species ◽  
One Year

Molluscs are important for ecological function, livelihoods and fisheries, but are often forgotten in research and management. Here, we investigated intra-annual variation in the landing and growth patterns of three mollusc species, i.e., Corbicula moreletiana, Pila virescens and Pila ampullacea, using one-year daily data on landing catches and values, recorded in Kampong Chhnang province of Tonle Sap (TS) Lake. Overall, 8330 tonnes with a first sale landing value of US$ 1.4 million for the three species were reported. Also, we found that C. moreletiana was abundant during the dry season with high temperature and less precipitation. By contrast, the two Pila species were abundant from the early rainy to early dry seasons when precipitation and water levels increase. The length–weight relationship analysis indicated that a faster growth in weight of Pila species occurred in the rainy season, and a general negative allometric growth was observed for the three species. This implies that their populations were intensively fished. Our preliminary results suggest that molluscs in the TS Lake (i) are important resources in support of people's livelihoods, (ii) respond differently to intra-annual variation in temperature, precipitation and hydrology and (iii) are being intensively exploited with significant reduction in growth rate. Therefore, it is necessary to conduct further comprehensive research describing status of mollusc stocks and their ecology to support long-term management and conservation of this important aquatic fauna. Our study contributes to establishing the first important baseline data and information on key mollusc species for the TS.

scholarly journals Economic analysis of ecosystem based adaptation and engineering options: A case study from Udayapur, Nepal

2015 ◽  
Vol 3 ◽  
pp. 35-42
Author(s):  
Dinesh Chandra Devkota ◽  
Kamal Thapa ◽  
Bhaskar Kharki
Keyword(s):  
Climate Change ◽  
Ecosystem Services ◽  
Economic Analysis ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Well Being ◽  
Benefit Analysis ◽  
High Benefit ◽  
Adaptation Options

Ecosystem services are vital to our well-being as they directly or indirectly support our survival and quality of life. But, the growing impact of climate change diminishes the benefit from ecosystem services. Therefore, identifying possible applicable adaptation options are inevitable to reduce the effect of climate change. The present research is based on a case study of Ksedi River watershed, Ajgada Village in Udaypur district of Nepal. The study demonstrates the comparison between different options to deal with flood and make a sound decision, based on economic rationale for long-term benefits. The present study compares ecosystem based adaptation options with engineering options using cost benefit analysis in order to protect village from flooding. Through stakeholder and expert consultations, ecosystem based adaptation options and economic options that are feasible in the village and catchment to mitigate the floods were listed. Economic analysis of these options and the different combinations were done using cost benefit analysis. Analysis was carried out for each of the different combination of options. Focus on ecosystem based adaptation options provide high benefit to cost return in terms of avoided damages and considering engineering options efficient in flood and erosion control in initial stage in spite of its high cost. The study suggests that reforestation in upland forest areas; plantation along riverbed and management of rangeland should be prioritized. Similarly, preparation of flood model, flood height damage curve and flood vulnerable maps specific to the site will help decision makers to implement site specific adaptation options.

scholarly journals Dams on Mekong tributaries as significant contributors of hydrological alterations to the Tonle Sap Floodplain in Cambodia

2014 ◽  
Vol 11 (2) ◽  
pp. 2177-2209 ◽  
Author(s):  
M. E. Arias ◽  
T. Piman ◽  
H. Lauri ◽  
T. A. Cochrane ◽  
M. Kummu
Keyword(s):  
Environmental Flows ◽  
Numerical Models ◽  
Flood Pulse ◽  
Economic Incentives ◽  
Water Levels ◽  
Surface Hydrology ◽  
Development Scenarios ◽  
Tonle Sap ◽  
Hydropower Potential ◽  
Annual Water

Abstract. River tributaries have a key role in the biophysical functioning of the Mekong Basin. Of particular attention are the Sesan, Srepok, and Sekong (3S) rivers, which contribute nearly a quarter of the total Mekong discharge. Forty two dams are proposed in the 3S, and once completed they will exceed the active storage of China's large dam cascade in the upper Mekong. Given their proximity to the lower Mekong floodplains, the 3S dams could alter the flood-pulse hydrology driving the productivity of downstream ecosystems. Therefore, the main objective of this study was to quantify how hydropower development in the 3S would alter the hydrology of the Tonle Sap floodplain, the largest wetland in the Mekong and home to one of the most productive inland fisheries in the world. We coupled results from four numerical models representing the basin's surface hydrology, water resources development, and floodplain hydrodynamics. The scale of alterations caused by hydropower in the 3S was compared with the basin's definite future development scenario (DF) driven by the upper Mekong dam cascade. The DF or the 3S development scenarios could independently increase Tonle Sap's 30 day minimum water levels by 30 ± 5 cm and decrease annual water level fall rates by 0.30 ± 0.05 cm d−1. When analyzed together (DF + 3S), these scenarios are likely to eliminate all baseline conditions (1986–2000) of extreme low water levels, a~particularly important component of Tonle Sap's environmental flows. Given the ongoing trends and large economic incentives in the hydropower business in the region, there is a high possibility that most of the 3S hydropower potential will actually be exploited and that dams would be built even in locations where there is a high risk of ecological disruptions. Hence, retrofitting current designs and operations to promote sustainable hydropower practices that optimize multiple river services – rather than just maximize hydropower generation – appear to be the most feasible alternative to mitigate hydropower-related disruptions in the Mekong.

Planktonic diatom community dynamics in a tropical flood-pulse lake: the Tonle Sap (Cambodia)

2019 ◽  
Vol 34 (1) ◽  
pp. 1-22
Author(s):  
Loïc Tudesque ◽  
Thomas K. Pool ◽  
Mathieu Chevalier
Keyword(s):  
Community Dynamics ◽  
Flood Pulse ◽  
Diatom Community ◽  
Planktonic Diatom ◽  
Tonle Sap

scholarly journals Economic Analysis for the UK National Ecosystem Assessment: Synthesis and Scenario Valuation of Changes in Ecosystem Services

2013 ◽  
Vol 57 (2) ◽  
pp. 273-297 ◽  
Author(s):  
Ian J. Bateman ◽  
Amii R. Harwood ◽  
David J. Abson ◽  
Barnaby Andrews ◽  
Andrew Crowe ◽  
...  
Keyword(s):  
Ecosystem Services ◽  
Economic Analysis ◽  
Ecosystem Assessment ◽  
Uk National Ecosystem Assessment ◽  
The Uk

Modelling spatial and temporal dynamics of two small mud carp species in the Tonle Sap flood-pulse ecosystem

2019 ◽  
Vol 392 ◽  
pp. 82-91 ◽  
Author(s):  
Bunyeth Chan ◽  
Ratha Sor ◽  
Peng Bun Ngor ◽  
Christophe Baehr ◽  
Sovan Lek
Keyword(s):  
Temporal Dynamics ◽  
Flood Pulse ◽  
Tonle Sap ◽  
Spatial And Temporal Dynamics

Tools for Sustainable Soil Management: Soil Ecosystem Services, EROI and Economic Analysis

2019 ◽  
Vol 157 ◽  
pp. 109-119 ◽  
Author(s):  
Jón Örvar G. Jónsson ◽  
Brynhildur Davíðsdóttir ◽  
Nikolaos P. Nikolaidis ◽  
Georgios V. Giannakis
Keyword(s):  
Ecosystem Services ◽  
Economic Analysis ◽  
Soil Management ◽  
Soil Ecosystem ◽  
Sustainable Soil Management ◽  
Soil Ecosystem Services

scholarly journals Spatial and Long-Term Temporal Changes in Water Quality Dynamics of the Tonle Sap Ecosystem

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2059
Author(s):  
Savoeurn Soum ◽  
Peng Bun Ngor ◽  
Thomas E. Dilts ◽  
Sapana Lohani ◽  
Suzanne Kelson ◽  
...  
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Water Level ◽  
Inorganic Nitrogen ◽  
Flood Pulse ◽  
Nutrient Ratios ◽  
Nitrogen And Phosphorus ◽  
Watershed Land Use ◽  
Tonle Sap

Tonle Sap lake-river floodplain ecosystem (TSE) is one of the world’s most productive freshwater systems. Changes in hydrology, climate, population density, and land use influence water quality in this system. We investigated long term water quality dynamics (22 years) in space and time and identified potential changes in nutrient limitation based on nutrient ratios of inorganic nitrogen and phosphorus. Water quality was assessed at five sites highlighting the dynamics in wet and dry seasons. Predictors of water quality included watershed land use, climate, population, and water level. Most water quality parameters varied across TSE, except pH and nitrate that remained constant at all sites. In the last decade, there is a change in the chemical nutrient ratio suggesting that nitrogen may be the primary limiting nutrient across the system. Water quality was strongly affected by development in the watershed i.e., flooded forest loss, climatic variation, population growth, and change in water level. Seasonal variations of water quality constituents were driven by precipitation and hydrology, notably the Mekong’s distinct seasonal flood pulse.

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