Runoff and sediment losses from 27 upland catchments in Southeast Asia: Impact of rapid land use changes and conservation practices

Valentin, Christian; Agus, Fahmuddin; Alamban, R. B.; Boosaner, A.; Bricquet, Jean‐Pierre; Chaplot, Vincent; Guzmán, Tejada; Rouw, Anneke de; Janeau, Jean‐Louis; Orange, Didier; Phachomphonh, K.; Phai, Do Duy; Podwojewski, Pascal; Ribolzi, Olivier; Silvera, Norbert; Subagyono, Kasdi; Thiébaux, Jean-Pierre; Toan, Tran Duc; Vadari, T.

doi:10.1016/j.agee.2008.06.004

Cited by 294 publications

(206 citation statements)

References 33 publications

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“…Although the conservation measures might have reduced the discharge during the rain phase slightly, the amount of rainfall was clearly more important in determining the total amount of discharge (Table 3, Tables S1 and S2). Other studies have shown that upland conservation practices decreased direct runoff in Ethiopia [18,22,41] and elsewhere in the world [42,43]. The effect on discharge of the soil and conservation practices at the outlet in the Guale watershed was minimal, while in the Tikur-Wuha watershed, which could store the additional amount of infiltrated water, the direct runoff was decreased for comparable amounts of annual rainfall (Table 3, Tables S1 and S2).…”

Section: Overall Impact Of Soil and Water Conservation On Hydrologicamentioning

confidence: 87%

Impact of Soil Depth and Topography on the Effectiveness of Conservation Practices on Discharge and Soil Loss in the Ethiopian Highlands

Akale

Dagnew

Belete

et al. 2017

Land

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Abstract:Restoration of degraded landscapes through the implementation of soil and water conservation practices is considered a viable option to increase agricultural production by enhancing ecosystems. However, in the humid Ethiopian highlands, little information is available on the impact of conservation practices despite wide scale implementation. The objective of this research was to document the effect of conservation practices on discharge and sediment concentration and load in watersheds that have different soil depths and topography. Precipitation, discharge, and sediment concentration were measured from 2010 to 2012 in two watersheds in close proximity and located in the Lake Tana basin, Ethiopia: Tikur-Wuha and Guale watersheds. The Tikur-Wuha watershed has deep soils and a gentle slope stream channel. The Guale watershed has shallow soils and a steep slope stream channel. In early 2011, the local community installed upland conservation measures consisting of stone and soil bunds, waterways, cutoff drains, infiltration furrows, gully rehabilitation, and enclosures. The results show that conservation practices marginally decreased direct runoff in both watersheds and increased base flow in the Tikur-Wuha watershed. Average sediment concentration decreased by 81% in Tikur-Wuha and 45% in Guale. The practices intended to increase infiltration were most effective in the Tikur-Wuha watershed because the deep soil could store the infiltrated water and release it over a longer period of time after the rainy season than the steeper Guale watershed with shallow soils.

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Section: Overall Impact Of Soil and Water Conservation On Hydrologicamentioning

confidence: 87%

Impact of Soil Depth and Topography on the Effectiveness of Conservation Practices on Discharge and Soil Loss in the Ethiopian Highlands

Akale

Dagnew

Belete

et al. 2017

Land

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“…Mae Sa Mai watershed can be further regarded representative of areas in close proximities to regional market hubs (here: Chiang Mai city). The challenges the watershed faces have been also described for other mountainous regions of Mainland Southeast Asia [20] and tropical environments under transition, especially those with a strong dependence on agricultural production [11,19,21].…”

Section: Study Areamentioning

confidence: 99%

Simulating Stakeholder-Based Land-Use Change Scenarios and Their Implication on Above-Ground Carbon and Environmental Management in Northern Thailand

Lippe

Hilger

Sudchalee³

et al. 2017

Land

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Abstract:The objective of this study was to examine whether the coupling of a land-use change (LUC) model with a carbon-stock accounting approach and participatory procedures can be beneficial in a data-limited environment to derive implications for environmental management. Stakeholder-based LUC scenarios referring to different storylines of agricultural intensification and reforestation were simulated to explore their impact on above-ground carbon (AGC) for a period of twenty years . The watershed of Mae Sa Mai, Northern Thailand was used as a case study for this purpose. Coupled model simulations revealed that AGC stocks could be increased by up to 1.7 Gg C through expansion of forests or orchard areas. A loss of up to 0.4 Gg C would occur if vegetable production continue to expand at the expense of orchard and fallow areas. The coupled model approach was useful due to its moderate data demands, enabling the comparison of land-use types differing in AGC build-up rates and rotation times. The scenario analysis depicted clear differences in the occurrence of LUC hotspots, highlighting the importance of assessing the impact of potential future LUC pathways at the landscape level. The use of LUC scenarios based on local stakeholder scenarios offer a higher credibility for climate mitigation strategies but also underline the need to co-design policy frameworks that acknowledge the heterogeneity of stakeholder needs and environmental management frameworks.

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“…The work is presented in the context of the trans-boundary Ca River basin in Vietnam. Like many other river basins in southeast Asia [12,13], there are many water related problems in the Ca River basin due to water shortage, pollution, and competing interests. In addition to this, the Ca River basin has recently experienced a drought and salt water intrusion, making it the focal point for a USAID funded study on alternative water resource management strategies.…”

Section: Introductionmentioning

confidence: 99%

A Self-Calibrating Runoff and Streamflow Remote Sensing Model for Ungauged Basins Using Open-Access Earth Observation Data

Poortinga¹,

Bastiaanssen

Simons

et al. 2017

Remote Sensing

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Due to increasing pressures on water resources, there is a need to monitor regional water resource availability in a spatially and temporally explicit manner. However, for many parts of the world, there is insufficient data to quantify stream flow or ground water infiltration rates. We present the results of a pixel-based water balance formulation to partition rainfall into evapotranspiration, surface water runoff and potential ground water infiltration. The method leverages remote sensing derived estimates of precipitation, evapotranspiration, soil moisture, Leaf Area Index, and a single F coefficient to distinguish between runoff and storage changes. The study produced significant correlations between the remote sensing method and field based measurements of river flow in two Vietnamese river basins. For the Ca basin, we found R 2 values ranging from 0.88-0.97 and Nash-Sutcliffe efficiency (NSE) values varying between 0.44-0.88. The R 2 for the Red River varied between 0.87-0.93 and NSE values between 0.61 and 0.79. Based on these findings, we conclude that the method allows for a fast and cost-effective way to map water resource availability in basins with no gauges or monitoring infrastructure, without the need for application of sophisticated hydrological models or resource-intensive data.

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Runoff and sediment losses from 27 upland catchments in Southeast Asia: Impact of rapid land use changes and conservation practices

Cited by 294 publications

References 33 publications

Impact of Soil Depth and Topography on the Effectiveness of Conservation Practices on Discharge and Soil Loss in the Ethiopian Highlands

Impact of Soil Depth and Topography on the Effectiveness of Conservation Practices on Discharge and Soil Loss in the Ethiopian Highlands

Simulating Stakeholder-Based Land-Use Change Scenarios and Their Implication on Above-Ground Carbon and Environmental Management in Northern Thailand

A Self-Calibrating Runoff and Streamflow Remote Sensing Model for Ungauged Basins Using Open-Access Earth Observation Data

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