The present topography and soil thickness reflect a sensitive balance between weathering, erosion, and deposition. Erosion and sedimentation in a semiarid environment channel and hillslope processes in a semiarid area, new mexico by luna b. Runoff mechanisms in this lecture, we take a broad view of hillslope any parts of a. This second edition is a model of clarity, production and explanation. Worked examples of all mathematical analyses are provided. Both the fundamentals of erosion and slope stability are discussed in this chapter with respect to processes, causes and impacts. Brown 1995, in a twodimensional model, incorporated both infiltration partitioning and overland flow into the hillslope flow model. The stabilizing strength of hillslope materials depends on effective stress, which is diminished by rainfall. Model simulations using available field data were compared to field observations of rainfallpore pressure responses and were found to be in reasonable agreement.
Hillslope processes occur on a complex template, composed of a wide array of topographies, climates, geologies, and ecosystems chapter 2, physiography of british columbia. Hillslopestorage boussinesq model for subsurface flow and. This book is intended for students who approach the study of hillslopes, and the rocks and soils on which they develop, from such traditional disciplines as geomorphology, geology, engineering, and soil science. All part of the land surface are linked in the flow of water, solutes and sediment through the drainage basin system. Flow processes in and over this hillslope will be influenced by its geometry as well as by the hydraulic properties of the porous medium and the surface. Functional relationships between denudation and hillslope. Pdf this chapter describes the dominant types of processes present on. Introduction of a sourcesink term n allows simulation of storminterstorm sequences in addition to drainage processes, while a function s. Strande anorthwest watershed research center, agricultural research service, usda, 800 park boulevard, plaza 4, suite 105, boise, id 83712, usa. Selby, 9780198741831, available at book depository with free delivery worldwide.
Myrich abstract ephemeral washes having drainage areas from a few acres to 5 square miles are shown by actual measurement to be ac cumulating sediment on the streambed. At the same time, students learn to experiment with different functions and come up with questions about inquiring into surface processes that they would unlikely have come up with by looking at photographs and maps or landscape models generated by someone else. Sediment transport mechanisms on soilmantled hillslopes. Advances in understanding of hydrological processes have been abundant in the last.
In many areas, the dominant source of sediment is the stream bank itself. The components which are considered in modelling the hillslope flow are the nature of flows in the macropore and micropore domains, the spatial and temporal characteristics of the macropore network, the interaction between the domains, and the initiation of. Throughout the text emphasis is placed on the problems of data collection in the field and on the reliability of interpretations. The study of hillslopes is shared as an interest by a wide constituency of scientists. Log in or sign up to manage your videos and for new video alerts. This book presents a cuttingedge quantitative approach to understanding hydromechanical processes across variably saturated hillslope environments and to the study and prediction of rainfallinduced landslides. Hillslopes provide the gradients enabling material to be. Matlab is being used as an inquiry tool to investigate hillslope surfaces. Chapter denudation, weathering and mass wasting routledge. The role of soil processes in determining mechanisms of. Hillslope materials and processes 2nd edition by m. A variety of processes exist by which materials can be moved through the hillslope system. Hillslope hydrology and stability oregon state university.
Soil erodibility and processes of water erosion on hillslope. Structural and functional connectivity as a driver of. Rearrange individual pages or entire files in the desired order. Then we can look at how individual events, of different magnitudes, stack up in time. This book is intended for students who approach the stud. Recent studies have shown that the hillslope connection depends on. Process studies in hillslope hydrology pdf despite rapid hillslope transport processes during events, soil.
Subtitle language log in or sign up to manage your videos and for new video alerts. Channel processes are more important in higherorder streams. Fan and bras 1998 introduced the soil moisture storage capacity function s cx, defined as. Geomorphologists seek to understand why landscapes look the way they do, to understand. Computational inquiry into a hillslope surface model. The impact of natural hillslope processes is important and is currently strongly influenced by human activity due to land use change and vegetation removal, and is becoming even greater due to climate change. Approximately seventy per cent of the text is new, with many new figures and plates, which has enabled professor selby to provide a more comprehensive introduction than in the first edition to the nature of chemical bonding, the properties of mineral particles and fabrics of weak rock, rheology of rock and soil, hillslope hydrology, hillslope. This second edition has the same general purpose as the first edition. Unsorted, mobile or potentially mobile hillslope material that overlies a more stable substrate, including bedrock and consolidated sediments. Pdf on jan 1, 2010, m geertsema and others published hillslope processes find, read and cite all the research you need on researchgate. Colluvial accumulations merge with channel deposits and blanket the valleys and tributary basins even up to a few hundred feet of the drainage divides. Advances in hillslope hydrology have been numerous in the past four decades.
The role of soil processes in determining mechanisms of slope failure and hillslope development in a humidtropical forest, eastern puerto rico. The operation of mass movement processes relies upon the development of instability in the hillslope system. Selby 1985 water causes geomorphologicalchange by weathering, eroding and transporting earth materials. Slope angle is a major indicator of the stability of these sites. Learn vocabulary, terms, and more with flashcards, games, and other study tools. These processes are generically known as mass movement or mass wasting. Select multiple pdf files and merge them in seconds. Q3 q for main channel hydrology of 1st order streams are controlled by hillslope processes. This book presents a cuttingedge quantitative approach to understanding hydromechanical processes across variably saturated hillslope environments and to the study and prediction of. Geomorphology and stability analysis of the charonnier landslide.
Feb 03, 1983 hillslope materials and processes book. Structural and functional connectivity as a driver of hillslope erosion following disturbance c. The ratio ofcompressive strength of material saturated with water to that in dry state is known as coefficientof softening and describes the water resistance of materials. Hillslope runoff processes and models sciencedirect. The combined data set consisting of all soil failures shows that scar depth or deposit thickness does not vary with landslide area, whereas the median depths of soil landslide scars increase by less than one order of magnitude with increasing landslide area fig. The terms colluvium or colluvial materials are used to refer to deposits. In soilmantled parts of the world, the geomorphic and hydrologic processes involved in hillslope sediment transport are strongly influenced by soil properties. Since publication of the first edition, not only has knowledge advanced but an interdisciplinary approach to much of the research has become.
These different hillslope processes alter both the visual appearance of the landscape and the predicted relationship between slope and contributing area. Strande anorthwest watershed research center, agricultural research service, usda, 800 park boulevard, plaza 4, suite 105, boise, id 83712. Understand how interactions between different processes are expressed through geomorphological signatures created in the landscape. Benchscale experiments on effects of pipe flow and. Landslides are triggered when shear stress exceeds materials shear strength leading to failure. For materials like clay which soakreadily it is zero, whereas for materials like glass and. Understand the contribution of groundwater to storm runoff. Dorren lka, maier b, putters us, seijmonsbergen ac 2004 combining field and. Landslides are types of mass wasting that have a distinct plane or zone of sliding. Gcse igcse alevel ialevel ib geography national 5 geography.
The mountainous topography is responsible for creating a variety of climates. The role of soil processes in determining mechanisms of slope. Hillslope form 199 field investigation methods 201 11. It generally formed by weathering of underline material and moves downslope due to gravitational processes. Published by the american geophysical union as part of the water resources monograph series, volume 11. Hillslope runoff processes at any point on a hillslope surface, or within the soil, water is moving under potential gradients due to both gravity and water pressure or tension. Soil erodibility and processes of water erosion on hillslope rorke b. Hillslope processes, drainage density, and landscape. Hillslope materials and processes transportation research board. The text attempts to integrate the relevant subject matter from these disciplines from the point of view of an earth scientist. This chapter describes the processes and equations for a single ofe in sections 4.
Slope processes and landforms hillslopehydrology why hillslope hydrology. Apply the hillslope evolution model to investigate the environmental conditions associated with the formation of specific hillslope forms. This book is intended for students who approach the study of hillslopes and the rocks and soils on which they develop from such traditional. Hillslope materials and processes michael john selby, a. View notes 6hillslopes from ess 102 at morehead state university. Under the natural condition, water, sediments, and rocks move down slope. The physical processes connected with the runoff process on a hillslope are identified. Hillslope materials and processes ebook library publishing jan 28, 2020.
This balance is governed by two coupled physical processes. Water in soils and hillslope hydrology 202 water in soils 202 surface tension and capillarity 202 soilwater potential 203 soilwater content and tension 204 soilwater movement 205 hillslopes in the hydrological cycle 207 interception 208 infiltration 208 concepts of runoff 2 runoff processes 214. This book integrates the approaches of geologists, geomorphologists and engineers to the study of hillslopes. Since this is a lively, ongoing chat, heres some meat, from hillslope materials and processes, selby, 1993. The present study concerned the amounts of sediment pro duced by different erosion processes in various physiographic positions in the drainage basins. Bryan soil erosion laboratory, faculty of forestry, uni. Hillslope processes shape mountain landscapes, but how do these processes actually work. Modelling of hillslope runoff processes springerlink. British columbia is a diverse province with mountain ranges and incised plateaus. A small, shallow channel in some soil, created by the erosion of flowing water.
Specific hillslope processes examine processes operating on hillslopes. Look first at the physics and geomorphic results of individual events e. On the basis of the different threshold theories, we derive expressions for the relationships between drainage density and environmental factors such as rainfall, relief, and mean erosion rate. The role of subsurface flow in hillslope and stream bank erosion. Hillslope processes hillslopes essentially cover the whole landscape. Hillslope hydrology and stability ning lu colorado school of mines jonathan godt united states geological survey, colorado about the book landslides are caused by a failure of the mechanical balance within hillslopes. Materials noncohesive coarsetextured materials low in claysized particles colluvium sands gravels weathered sur residual soils face of most tills debris avalanches and debris flows dominate in noncohesive materials.1044 30 714 1033 842 1450 479 772 499 495 74 440 1303 678 837 673 1427 1072 1348 977 101 657 1057 824 1487 1373 308 965 478 1405 566 522 226 682 190 1319 213 982 1025 982 1463 1296 585 687 1130