Modeling forest management effects on water and sediment yield from nested, paired watersheds in the interior Pacific Northwest, USA using WEPP

The Nahal Yael basin is underlain chiefly by schist, amphibolite, and granite. Thin (generally <1 m thick), grussy colluvium which covered the lower portions of granitic hillslopes in the late Pleistocene has now been stripped completely, causing marked contrasts in outcrop morphologies, even where there is no contrast of fracture density or petrologic characteristics. Formerly mantled slopes are now smooth and crumbly, and lack desert varnish. Previously unmantled slopes are rough and craggy, and varnished but little weathered. Such stripping suggests a change from a semiarid to a drier and/or warmer climate. Slopes underlain by amphibolite responded similarly to the climatic change, but the amphibolite was more deeply weathered, and the colluvium was only partially stripped. The least stripping of colluvium occurred on schist hillslopes, partly because schist outcrops require more rain to generate runoff, and partly because angular blocks of schist require larger flows for transport, compared to other slope lithologies. The stream subsystem responded to the climatically induced changes in the discharge of water and sediment from the hillslopes. Increase in sediment yield caused valley alluviation in the early Holocene, and a decrease in sediment yield later in the Holocene caused entrenchment of the valley fill. More granite and amphibolite gravel-size particles are transported now than when the hillslopes were extensively mantled. Dense networks of trails are not common on Holocene geomorphic surfaces, but are present on remnants of Pleistocene surfaces.

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Water and sediment evolution in areas with high and coarse sediment yield of the Loess Plateau

International Journal of Sediment Research ◽

10.1016/s1001-6279(14)60004-4 ◽

2013 ◽

Vol 28 (4) ◽

pp. 448-457 ◽

Cited By ~ 7

Author(s):

Jia-hong LIU ◽

Guang-qian WANG ◽

Hai-hong LI ◽

Jia-guo GONG ◽

Jing-yi HAN

Keyword(s):

Loess Plateau ◽

Sediment Yield ◽

The Loess Plateau ◽

Coarse Sediment ◽

Water And Sediment

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ASSESSMENT OF FOREST MANAGEMENT EFFECTS ON NITRATE REMOVAL BY RIPARIAN BUFFER SYSTEMS

Transactions of the ASAE ◽

10.13031/2013.21283 ◽

1997 ◽

Vol 40 (2) ◽

pp. 383-391 ◽

Cited By ~ 18

Author(s):

R. K. Hubbard ◽

R. Lowrance

Keyword(s):

Forest Management ◽

Nitrate Removal ◽

Riparian Buffer ◽

Management Effects

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Response of Variation of Water and Sediment to Landscape Pattern in the Dapoling Watershed

Sustainability ◽

10.3390/su14020678 ◽

2022 ◽

Vol 14 (2) ◽

pp. 678

Author(s):

Chong Wei ◽

Zhiqiang Zhang ◽

Zhiguo Wang ◽

Lianhai Cao ◽

Yichang Wei ◽

...

Keyword(s):

Landscape Pattern ◽

Sediment Yield ◽

Landscape Heterogeneity ◽

Swat Model ◽

Landscape Patterns ◽

Land Resource ◽

Low Carbon ◽

Water And Sediment ◽

The Relationship ◽

Runoff And Sediment Yield

The relationship between water-sediment processes and landscape pattern changes has currently become a research hotspot in low-carbon water and land resource optimization research. The SWAT-VRR model is a distributed hydrological model which better shows the effect of land use landscape change on hydrological processes in the watershed. In this paper, the hydrological models of the Dapoling watershed were built, the runoff and sediment yield from 2006 to 2011 were simulated, and the relationship between landscape patterns and water-sediment yield was analyzed. The results show that the SWAT-VRR model is more accurate and reasonable in describing runoff and sediment yield than the SWAT model. The sub-basins whose soil erosion is relatively light are mostly concentrated in the middle reaches with a slope mainly between 0–5°. The NP, PD, ED, SPIIT, SHEI, and SHDI of the watershed increased slightly, and the COHESION, AI, CONTAG, and LPI showed a certain decrease. The landscape pattern is further fragmented, with the degree of landscape heterogeneity increasing and the connection reducing. The runoff, sediment yield and surface runoff are all extremely significantly negatively correlated with forest, which implies that for more complicated patch shapes of forest which have longer boundaries connecting with the patches of other landscape types, the water and sediment processes are regulated more effectively. Therefore, it can be more productive to carry out research on the optimization of water and soil resources under the constraint of carbon emission based on the SWAT-VRR model.

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A modeling approach to evaluate the impact of conservation practices on water and sediment yield in Sasumua Watershed, Kenya

Journal of Soil and Water Conservation ◽

10.2489/jswc.70.2.75 ◽

2015 ◽

Vol 70 (2) ◽

pp. 75-90 ◽

Cited By ~ 11

Author(s):

J. K. Mwangi ◽

C. A. Shisanya ◽

J. M. Gathenya ◽

S. Namirembe ◽

D. N. Moriasi

Keyword(s):

Sediment Yield ◽

Conservation Practices ◽

Modeling Approach ◽

Water And Sediment ◽

The Impact

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Forest Management Effects on Below-Ground Hydrological Processes

Forest Management and the Water Cycle - Ecological Studies ◽

10.1007/978-90-481-9834-4_16 ◽

2010 ◽

pp. 291-312

Author(s):

Viliam Novák ◽

Viliam Pichler ◽

Elisabeth Graf-Pannatier ◽

Edward P. Farrell ◽

Marián Homolák

Keyword(s):

Forest Management ◽

Hydrological Processes ◽

Below Ground ◽

Management Effects

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Long‐term hydrologic recovery after wildfire and post‐fire forest management in the interior Pacific Northwest

Hydrological Processes ◽

10.1002/hyp.13665 ◽

2020 ◽

Vol 34 (5) ◽

pp. 1182-1197 ◽

Cited By ~ 8

Author(s):

Ryan J. Niemeyer ◽

Kevin D. Bladon ◽

Richard D. Woodsmith

Keyword(s):

Forest Management ◽

Pacific Northwest

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Assessing the Impact of Terraces and Vegetation on Runoff and Sediment Routing Using the Time-Area Method in the Chinese Loess Plateau

Water ◽

10.3390/w11040803 ◽

2019 ◽

Vol 11 (4) ◽

pp. 803 ◽

Cited By ~ 5

Author(s):

Juan Bai ◽

Shengtian Yang ◽

Yichi Zhang ◽

Xiaoyan Liu ◽

Yabing Guan

Keyword(s):

Sediment Yield ◽

Reduction Rate ◽

Chinese Loess Plateau ◽

Area Method ◽

Chinese Loess ◽

Sediment Routing ◽

Water And Sediment ◽

Sediment Reduction ◽

The Impact ◽

The Chinese Loess Plateau

Terracing and vegetation are an effective practice for soil and water conservation on sloped terrain. They can significantly reduce the sediment yield from the surface area, as well as intercept the sediment yield from upstream. However, most hydrological models mainly simulate the effect of the terraces and vegetation on water and sediment reduction from themselves, without considering their roles in the routing process, and thus likely underestimate their runoff and sediment reduction effect. This study added the impact of terraces and vegetation practice on water and sediment routing using the time-area method. The outflow in each travel time zone was revised in each time step by extracting the watershed of the terrace units and the vegetation units and calculating the water or sediment stored by the terraces or held by the vegetation. The revised time-area method was integrated into the Land change Model-Modified Universal Soil Loss Equation (LCM-MUSLE) model. Pianguanhe Basin, in the Chinese Loess Plateau, was chosen as the study area and eight storms in the 1980s and 2010s were selected to calibrate and verify the original LCM-MUSLE model and its revised version. The results showed that the original model was not applicable in more recent years, since the surface was changed significantly as a result of revegetation and slope terracing, while the accuracy improved significantly when using the revised version. For the three events in the 2010s, the average runoff reduction rate in routing process was 51.02% for vegetation, 26.65% for terraces, and 71.86% for both terraces and vegetation. The average sediment reduction rate in routing process was 32.22% for vegetation, 24.52% for terraces, and 53.85% for both terraces and vegetation. This study provides a generalized method to quantitatively assess the impact of terraces and vegetation practice on runoff and sediment reduction at the catchment scale.

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